{"id":59,"date":"2024-09-08T16:54:01","date_gmt":"2024-09-08T07:54:01","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=59"},"modified":"2025-03-24T08:55:07","modified_gmt":"2025-03-23T23:55:07","slug":"ruby-on-rails-db%e3%83%9e%e3%82%a4%e3%82%b0%e3%83%ac%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e5%88%9d%e5%bf%83%e8%80%85%e3%81%a7%e3%82%82%e4%bd%bf","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=59","title":{"rendered":"Ruby on Rails DB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u521d\u5fc3\u8005\u3067\u3082\u4f7f\u3044\u3053\u306a\u305b\u308b7\u3064\u306e\u5fc5\u9808\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n<p>Ruby on Rails\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6210\u9577\u306b\u5408\u308f\u305b\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002<br>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u521d\u5fc3\u8005\u304b\u3089\u4e0a\u7d1a\u8005\u307e\u3067\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u57fa\u790e\u304b\u3089\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3092\u7db2\u7f85\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u8a18\u4e8b\u3092\u901a\u3057\u3066\u7406\u89e3\u3067\u304d\u308b8\u3064\u306e\u3053\u3068<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\">\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u57fa\u672c\u6982\u5ff5\u3068\u91cd\u8981\u6027<\/li>\n\n\n\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210\u65b9\u6cd5\u3068\u69cb\u9020<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u4e3b\u8981\u306a\u64cd\u4f5c<\/li>\n\n\n\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3068\u7ba1\u7406\u306e\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c6\u30af\u30cb\u30c3\u30af<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u5909\u66f4\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u9ad8\u5ea6\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30c6\u30af\u30cb\u30c3\u30af<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u7ba1\u7406\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/li>\n\n\n\n<li>\u3088\u304f\u3042\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u7b56<\/li>\n\n\n\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30b9\u30ad\u30eb\u5411\u4e0a\u306e\u305f\u3081\u306e\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9\u3068\u30b3\u30df\u30e5\u30cb\u30c6\u30a3<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">1. Ruby on Rails\u306eDB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u91cd\u8981\u6027\u3068\u57fa\u672c\u6982\u5ff5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u3082\u305f\u3089\u3059\u958b\u767a\u52b9\u7387\u306e\u5411\u4e0a<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">2. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210\uff1astep by step\u3067\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">rails generate\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u751f\u6210<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u69cb\u9020\u3068\u4e3b\u8981\u30e1\u30bd\u30c3\u30c9<\/a>      <\/li>      <li>        <a href=\"#i-16\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u306e\u5177\u4f53\u7684\u306a\u624b\u9806<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-21\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u6642\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-27\">3. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3092\u5b9f\u88c5\u3059\u308b\uff1a\u3088\u304f\u4f7f\u3046\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u64cd\u4f5c<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-28\">\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210\u3068\u524a\u9664<\/a>      <\/li>      <li>        <a href=\"#i-31\">\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0\u3001\u5909\u66f4\u3001\u524a\u9664<\/a>      <\/li>      <li>        <a href=\"#i-35\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u5916\u90e8\u30ad\u30fc\u306e\u64cd\u4f5c<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-40\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u64cd\u4f5c\u306e\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-41\">4. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3068\u7ba1\u7406\uff1a\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-42\">rake db:migrate\u306e\u4f7f\u3044\u65b9\u3068\u6ce8\u610f\u70b9<\/a>      <\/li>      <li>        <a href=\"#i-45\">\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3068\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-50\">\u305d\u306e\u4ed6\u306e\u6709\u7528\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u95a2\u9023\u30b3\u30de\u30f3\u30c9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-55\">\u74b0\u5883\u5225\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-59\">5. \u9ad8\u5ea6\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30c6\u30af\u30cb\u30c3\u30af\uff1a\u8907\u96d1\u306a\u5909\u66f4\u3092\u52b9\u7387\u7684\u306b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-60\">\u30c7\u30fc\u30bf\u79fb\u884c\u3092\u542b\u3080\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-61\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>      <\/li>      <li>        <a href=\"#i-65\">\u8907\u96d1\u306a\u30b9\u30ad\u30fc\u30de\u5909\u66f4\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-66\">\u6761\u4ef6\u4ed8\u304d\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4f5c\u6210<\/a>      <\/li>      <li>        <a href=\"#i-67\">\u30ea\u30d0\u30fc\u30b7\u30d6\u30eb\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u91cd\u8981\u6027<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-68\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5185\u3067\u306eRuby\u30b3\u30fc\u30c9\u5b9f\u884c<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-72\">6. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a\u30c1\u30fc\u30e0\u958b\u767a\u3067\u5f79\u7acb\u3064Tips<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-73\">\u547d\u540d\u898f\u5247\u3068\u4e00\u8cab\u6027\u306e\u7dad\u6301<\/a>      <\/li>      <li>        <a href=\"#i-76\">\u53ef\u9006\u7684\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4f5c\u6210<\/a>      <\/li>      <li>        <a href=\"#i-77\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c6\u30b9\u30c8<\/a>      <\/li>      <li>        <a href=\"#i-81\">\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u7ba1\u7406\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-82\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-86\">7. \u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\uff1a\u3088\u304f\u3042\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-87\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-91\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\u306e\u4e88\u9632\u7b56<\/a>      <\/li>      <li>        <a href=\"#i-92\">\u672c\u756a\u74b0\u5883\u3067\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u6642\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>      <li>        <a href=\"#i-93\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u65b9\u6cd5\u3068\u305d\u306e\u969b\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-94\">\u8907\u96d1\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-99\">8. \u307e\u3068\u3081\uff1aDB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30de\u30b9\u30bf\u30fc\u3078\u306e\u9053<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-100\">\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u304c\u3082\u305f\u3089\u3059\u30e1\u30ea\u30c3\u30c8<\/a>      <\/li>      <li>        <a href=\"#i-101\">\u7d99\u7d9a\u7684\u306a\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9\u3068\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u53c2\u52a0\u306e\u91cd\u8981\u6027<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-104\">Ruby on Rails\u3068ActiveRecord\u306e\u672a\u6765<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-sgb-headings sgb-heading\" id=\"i-0\"><span class=\"sgb-heading__inner sgb-heading--type1 with-icon\" style=\"background-color:transparent;border-color:transparent;font-size:1.2em\"><i class=\"fa fa-check\" style=\"color:var(--wp--preset--color--sango-main)\"><\/i><span class=\"sgb-heading__text\" style=\"color:#333\">1. Ruby on Rails\u306eDB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u89e3\u8aac<\/span><\/span><\/h2>\n\n\n\n<p>Ruby on Rails\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6210\u9577\u306b\u5408\u308f\u305b\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u9032\u5316\u3055\u305b\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002<br>\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u5c65\u6b74\u3092\u7ba1\u7406\u3059\u308b\u300c\u30bf\u30a4\u30e0\u30de\u30b7\u30f3\u300d\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u91cd\u8981\u6027\u3068\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u5909\u66f4\u3092\u8ffd\u8de1\u53ef\u80fd\u3067\u518d\u73fe\u53ef\u80fd\u306a\u65b9\u6cd5\u3067\u7ba1\u7406\u3059\u308b\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u306f\u3001\u4ee5\u4e0b\u306e\u57fa\u672c\u6982\u5ff5\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\uff1a\u5404\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304c\u4ed8\u4e0e\u3055\u308c\u3001\u9806\u5e8f\u4ed8\u3051\u3089\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30b9\u30ad\u30fc\u30de\u5909\u66f4\u306e\u81ea\u52d5\u5316\uff1aRuby \u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u74b0\u5883\u9593\u306e\u4e00\u8cab\u6027\uff1a\u958b\u767a\u3001\u30c6\u30b9\u30c8\u3001\u672c\u756a\u74b0\u5883\u3067\u540c\u3058\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a3\u3064\u306e\u7528\u8a9e<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\">\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u3092\u5b9a\u7fa9\u3059\u308b Ruby \u30b9\u30af\u30ea\u30d7\u30c8<\/li>\n\n\n\n<li>up\/down \u30e1\u30bd\u30c3\u30c9\uff1a\u5909\u66f4\u3092\u9069\u7528\/\u53d6\u308a\u6d88\u3059\u305f\u3081\u306e\u65b9\u6cd5\u3092\u5b9a\u7fa9<\/li>\n\n\n\n<li>\u30b9\u30ad\u30fc\u30de\u30d0\u30fc\u30b8\u30e7\u30f3\uff1a\u73fe\u5728\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u8ffd\u8de1<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u3082\u305f\u3089\u3059\u958b\u767a\u52b9\u7387\u306e\u5411\u4e0a<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5c0e\u5165\u306b\u3088\u308a\u3001\u958b\u767a\u30d7\u30ed\u30bb\u30b9\u306f\u5927\u304d\u304f\u6539\u5584\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u5354\u8abf\u4f5c\u696d\u306e\u6539\u5584<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5168\u3066\u306e\u958b\u767a\u8005\u304c\u540c\u3058\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3067\u4f5c\u696d\u3067\u304d\u308b<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d5\u30ea\u30af\u30c8\u306e\u65e9\u671f\u767a\u898b\u3068\u89e3\u6c7a\u304c\u53ef\u80fd<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u30d7\u30ed\u30bb\u30b9\u306e\u7c21\u7d20\u5316<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3092\u81ea\u52d5\u5316\u3057\u3001\u4eba\u7684\u30df\u30b9\u3092\u524a\u6e1b<\/li>\n\n\n\n<li>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u5bb9\u6613\u306b\u306a\u308a\u3001\u30ea\u30b9\u30af\u3092\u8efd\u6e1b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u306e\u5c65\u6b74\u7ba1\u7406<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5404\u5909\u66f4\u306e\u7406\u7531\u3068\u5185\u5bb9\u3092\u8ffd\u8de1\u53ef\u80fd<\/li>\n\n\n\n<li>\u554f\u984c\u767a\u751f\u6642\u306e\u539f\u56e0\u7279\u5b9a\u304c\u5bb9\u6613\u306b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-6\">\u30c6\u30b9\u30c8\u74b0\u5883\u306e\u8fc5\u901f\u306a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u65b0\u3057\u3044\u74b0\u5883\u3092\u7d20\u65e9\u304f\u3001\u6b63\u78ba\u306b\u69cb\u7bc9\u53ef\u80fd<\/li>\n\n\n\n<li>\u7d99\u7d9a\u7684\u30a4\u30f3\u30c6\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\/\u30c7\u30ea\u30d0\u30ea\u30fc\uff08CI\/CD\uff09\u306e\u30b5\u30dd\u30fc\u30c8<\/li>\n<\/ul>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a2\u30b8\u30e3\u30a4\u30eb\u958b\u767a\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u306e\u7ba1\u7406<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u9032\u5316\u306b\u67d4\u8edf\u306b\u5bfe\u5fdc<\/li>\n\n\n\n<li>\u672c\u756a\u74b0\u5883\u3078\u306e\u5b89\u5168\u306a\u30c7\u30d7\u30ed\u30a4\u3092\u5b9f\u73fe<\/li>\n<\/ul>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u3092\u30b3\u30fc\u30c9\u3067\u884c\u3046\u300cDatabase as Code\u300d\u306e\u8003\u3048\u65b9\u3092\u4f53\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u306b\u3088\u308a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6210\u9577\u306b\u4f34\u3046\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u9032\u5316\u3092\u3001\u5b89\u5168\u304b\u3064\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u969b\u306b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3001\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-sgb-headings sgb-heading\" id=\"i-7\"><span class=\"sgb-heading__inner sgb-heading--type1 with-icon\" style=\"background-color:transparent;border-color:transparent;font-size:1.2em\"><i class=\"fa fa-check\" style=\"color:var(--wp--preset--color--sango-main)\"><\/i><span class=\"sgb-heading__text\" style=\"color:#333\">2. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210\uff1astep by step\u3067\u89e3\u8aac<\/span><\/span><\/h2>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u3092\u5b9a\u7fa9\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002<br>\u3053\u3053\u3067\u306f\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210\u65b9\u6cd5\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">rails generate\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u751f\u6210<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3059\u308b\u306b\u306f\u3001Rails\u306e<code>generate<\/code>\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">rails generate migration \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u540d<\/pre>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b\u5834\u5408<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">rails generate migration CreateUsers<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001<code>db\/migrate<\/code>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u65b0\u3057\u3044\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u69cb\u9020\u3068\u4e3b\u8981\u30e1\u30bd\u30c3\u30c9<\/h3>\n\n\n\n<p>\u751f\u6210\u3055\u308c\u305f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u9020\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class CreateUsers &lt; ActiveRecord::Migration[6.1]\n  def change\n    # \u3053\u3053\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u3092\u8a18\u8ff0\n  end\nend<\/pre>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30eb\u540d\u3068\u69cb\u9020\u306e\u7279\u5fb4<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d5\u30a1\u30a4\u30eb\u540d\u306e\u5148\u982d\u306b\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u304c\u4ed8\u4e0e\u3055\u308c\u308b\uff08\u4f8b\uff1a<code>20230905123456_create_users.rb<\/code>\uff09<\/li>\n\n\n\n<li>\u30af\u30e9\u30b9\u540d\u306f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u540d\u3092CamelCase\u306b\u5909\u63db\u3057\u305f\u3082\u306e<\/li>\n\n\n\n<li>\u89aa\u30af\u30e9\u30b9\u306f<code>ActiveRecord::Migration[\u30d0\u30fc\u30b8\u30e7\u30f3]<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4e3b\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3068\u305d\u306e\u4f7f\u7528\u4f8b\u306f\u4ee5\u4e0b\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-10\"><code>create_table<\/code><\/h4>\n\n\n\n<p>\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   create_table :users do |t|\n     t.string :name\n     t.string :email\n     t.timestamps\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-11\"><code>add_column<\/code><\/h4>\n\n\n\n<p>\u65e2\u5b58\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u65b0\u3057\u3044\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   add_column :users, :age, :integer<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-12\"><code>remove_column<\/code><\/h4>\n\n\n\n<p>\u65e2\u5b58\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   remove_column :users, :age<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-13\"><code>change_column<\/code><\/h4>\n\n\n\n<p>\u65e2\u5b58\u306e\u30ab\u30e9\u30e0\u306e\u5b9a\u7fa9\u3092\u5909\u66f4\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   change_column :users, :email, :string, null: false<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-14\"><code>add_index<\/code><\/h4>\n\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   add_index :users, :email, unique: true<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\"><code>remove_index<\/code><\/h4>\n\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u524a\u9664\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   remove_index :users, :email<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3082\u8868\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u306e\u5177\u4f53\u7684\u306a\u624b\u9806<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-17\">1. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u540d\u3092\u6c7a\u3081\u308b<\/h4>\n\n\n\n<p>\u5909\u66f4\u5185\u5bb9\u3092\u7c21\u6f54\u306b\u8868\u3059\u540d\u524d\u3092\u9078\u3073\u307e\u3059\u3002\uff08\u4f8b\uff1a<code>AddEmailToUsers<\/code>\uff09<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-18\">2. rails generate migration\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   rails generate migration AddEmailToUsers<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-19\">3. \u751f\u6210\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u7de8\u96c6<\/h4>\n\n\n\n<p><code>db\/migrate<\/code>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u5185\u306e\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-20\">4. up\/down\u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306fchange\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5<\/h4>\n\n\n\n<p><code>change<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u81ea\u52d5\u7684\u306b\u9006\u64cd\u4f5c\u3092\u751f\u6210\u3067\u304d\u308b\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<br>\u8907\u96d1\u306a\u5909\u66f4\u306e\u5834\u5408\u306f<code>up<\/code>\u3068<code>down<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u500b\u5225\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u30c6\u30fc\u30d6\u30eb\u306bemail\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AddEmailToUsers &lt; ActiveRecord::Migration[6.1]\n  def change\n    add_column :users, :email, :string\n    add_index :users, :email, unique: true\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001<code>change<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<br>Rails\u306f\u81ea\u52d5\u7684\u306b<code>remove_column<\/code>\u3068<code>remove_index<\/code>\u3092\u9006\u64cd\u4f5c\u3068\u3057\u3066\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u6642\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-22\">\u30fb\u547d\u540d\u898f\u5247\u306b\u5f93\u3046<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u540d\u306f\u5909\u66f4\u5185\u5bb9\u3092\u660e\u78ba\u306b\u8868\u3059\u3082\u306e\u306b\u3057\u307e\u3057\u3087\u3046<\/li>\n\n\n\n<li>\u8907\u6570\u306e\u5358\u8a9e\u3092\u4f7f\u3046\u5834\u5408\u306fCamelCase\u3092\u4f7f\u7528\u3057\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">\u30fb\u53ef\u9006\u7684\u306a\u5909\u66f4\u3092\u5fc3\u304c\u3051\u308b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>change<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u81ea\u52d5\u7684\u306b\u9006\u64cd\u4f5c\u304c\u751f\u6210\u3067\u304d\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u5909\u66f4\u306e\u5834\u5408\u306f<code>up<\/code>\u3068<code>down<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u660e\u793a\u7684\u306b\u5b9a\u7fa9\u3057\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-24\">\u30fb\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u79fb\u884c\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u91cf\u304c\u591a\u3044\u5834\u5408\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u30d0\u30c3\u30c1\u51e6\u7406\u3084\u975e\u540c\u671f\u51e6\u7406\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-25\">\u30fb\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u3078\u306e\u5f71\u97ff\u3092\u8003\u616e\u3059\u308b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u3092\u78ba\u8a8d\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30c6\u30b9\u30c8\u3092\u66f4\u65b0\u3057\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-26\">\u30fb\u672c\u756a\u74b0\u5883\u3067\u306e\u5b9f\u884c\u3092\u60f3\u5b9a\u3059\u308b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u672c\u756a\u74b0\u5883\u3067\u5b89\u5168\u306b\u5b9f\u884c\u3067\u304d\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u6226\u7565\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046<\/li>\n<\/ul>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u6210\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3092\u7ba1\u7406\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u30b9\u30ad\u30eb\u3067\u3059\u3002<br>\u9069\u5207\u306b\u4f5c\u6210\u3055\u308c\u305f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u9032\u5316\u3068\u30c1\u30fc\u30e0\u958b\u767a\u306e\u52b9\u7387\u5316\u306b\u5927\u304d\u304f\u8ca2\u732e\u3057\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u969b\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3092\u5b9f\u88c5\u3059\u308b\u5177\u4f53\u7684\u306a\u64cd\u4f5c\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-sgb-headings sgb-heading\" id=\"i-27\"><span class=\"sgb-heading__inner sgb-heading--type1 with-icon\" style=\"background-color:transparent;border-color:transparent;font-size:1.2em\"><i class=\"fa fa-check\" style=\"color:var(--wp--preset--color--sango-main)\"><\/i><span class=\"sgb-heading__text\" style=\"color:#333\">3. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3092\u5b9f\u88c5\u3059\u308b\uff1a\u3088\u304f\u4f7f\u3046\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u64cd\u4f5c<\/span><\/span><\/h2>\n\n\n\n<p>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u3092\u5b9f\u88c5\u3059\u308b\u969b\u3001\u69d8\u3005\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u64cd\u4f5c\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br>\u3053\u3053\u3067\u306f\u3001\u3088\u304f\u4f7f\u3046\u64cd\u4f5c\u3068\u305d\u306e\u5b9f\u88c5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210\u3068\u524a\u9664<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-29\">\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210\uff08<code>create_table<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">create_table :products do |t|\n  t.string :name, null: false\n  t.text :description\n  t.decimal :price, precision: 10, scale: 2\n  t.references :category, foreign_key: true\n  t.timestamps\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u7279\u5fb4\u3092\u6301\u3064<code>products<\/code>\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>name<\/code>\uff08\u6587\u5b57\u5217\u578b\u3001NOT NULL\u5236\u7d04\uff09<\/li>\n\n\n\n<li><code>description<\/code>\uff08\u30c6\u30ad\u30b9\u30c8\u578b\uff09<\/li>\n\n\n\n<li><code>price<\/code>\uff0810\u6841\u306e\u7cbe\u5ea6\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b2\u6841\u306e\u5c0f\u6570\u578b\uff09<\/li>\n\n\n\n<li><code>category_id<\/code>\uff08\u5916\u90e8\u30ad\u30fc\uff09<\/li>\n\n\n\n<li><code>created_at<\/code>\u3068<code>updated_at<\/code>\uff08\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\uff09<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-30\">\u30c6\u30fc\u30d6\u30eb\u306e\u524a\u9664\uff08<code>drop_table<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">drop_table :products<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#f88080;color:#FFF\" class=\"sgb-box-simple__title\"><i class=\"fas fa-exclamation-circle\"><\/i> <code>drop_table<\/code>\u306e\u6ce8\u610f\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#f88080;background-color:#ffebeb\">\n<p><code>drop_table<\/code>\u306f\u4e0d\u53ef\u9006\u306a\u64cd\u4f5c\u3067\u3059\u3002\u4f7f\u7528\u3059\u308b\u969b\u306f\u5341\u5206\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-31\">\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0\u3001\u5909\u66f4\u3001\u524a\u9664<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-32\">\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0\uff08<code>add_column<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">add_column :users, :age, :integer, default: 0<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f<code>users<\/code>\u30c6\u30fc\u30d6\u30eb\u306b<code>age<\/code>\u3068\u3044\u3046\u6574\u6570\u578b\u306e\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3057\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u30920\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-33\">\u30ab\u30e9\u30e0\u306e\u5909\u66f4\uff08<code>change_column<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">change_column :products, :price, :float<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f<code>products<\/code>\u30c6\u30fc\u30d6\u30eb\u306e<code>price<\/code>\u30ab\u30e9\u30e0\u306e\u30c7\u30fc\u30bf\u578b\u3092<code>decimal<\/code>\u304b\u3089<code>float<\/code>\u306b\u5909\u66f4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-34\">\u30ab\u30e9\u30e0\u306e\u524a\u9664\uff08<code>remove_column<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">remove_column :users, :age, :integer<\/pre>\n\n\n\n<p><code>users<\/code>\u30c6\u30fc\u30d6\u30eb\u304b\u3089<code>age<\/code>\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3057\u307e\u3059\u3002<br>\u30c7\u30fc\u30bf\u578b\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u8aa4\u3063\u305f\u30ab\u30e9\u30e0\u306e\u524a\u9664\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-35\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u5916\u90e8\u30ad\u30fc\u306e\u64cd\u4f5c<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-36\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8ffd\u52a0\uff08<code>add_index<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">add_index :users, :email, unique: true<\/pre>\n\n\n\n<p>\u3053\u306e\u64cd\u4f5c\u306f<code>users<\/code>\u30c6\u30fc\u30d6\u30eb\u306e<code>email<\/code>\u30ab\u30e9\u30e0\u306b\u4e00\u610f\u6027\u5236\u7d04\u4ed8\u304d\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-37\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664\uff08<code>remove_index<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">remove_index :users, :email<\/pre>\n\n\n\n<p><code>users<\/code>\u30c6\u30fc\u30d6\u30eb\u306e<code>email<\/code>\u30ab\u30e9\u30e0\u304b\u3089\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u524a\u9664\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-38\">\u5916\u90e8\u30ad\u30fc\u306e\u8ffd\u52a0\uff08<code>add_foreign_key<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">add_foreign_key :products, :categories<\/pre>\n\n\n\n<p>\u3053\u306e\u64cd\u4f5c\u306f<code>products<\/code>\u30c6\u30fc\u30d6\u30eb\u306b<code>categories<\/code>\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u5916\u90e8\u30ad\u30fc\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-39\">\u5916\u90e8\u30ad\u30fc\u306e\u524a\u9664\uff08<code>remove_foreign_key<\/code>\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">remove_foreign_key :products, :categories<\/pre>\n\n\n\n<p><code>products<\/code>\u30c6\u30fc\u30d6\u30eb\u304b\u3089<code>categories<\/code>\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u5916\u90e8\u30ad\u30fc\u3092\u524a\u9664\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-40\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u64cd\u4f5c\u306e\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u30107STEP\u3011<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u578b\u306e\u9078\u629e\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30c7\u30fc\u30bf\u578b\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u52b9\u7387\u5316\u3068\u30af\u30a8\u30ea\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u304c\u56f3\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4f8b\uff1a\u77ed\u3044\u6587\u5b57\u5217\u306b\u306f<code>string<\/code>\u3001\u9577\u3044\u6587\u5b57\u5217\u306b\u306f<code>text<\/code>\u3092\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>NOT NULL\u5236\u7d04\u306e\u4f7f\u7528\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u9808\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f<code>null: false<\/code>\u3092\u6307\u5b9a\u3057\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u4fdd\u3061\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b89\u5b9a\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4f8b\uff1a<code>default: 0<\/code>\u3084<code>default: -&gt; { 'CURRENT_TIMESTAMP' }<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u4e00\u610f\u6027\u5236\u7d04\u306e\u8ffd\u52a0\n<ul class=\"wp-block-list\">\n<li>\u91cd\u8907\u3092\u8a31\u3055\u306a\u3044\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f\u4e00\u610f\u6027\u5236\u7d04\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4f8b\uff1a<code>add_index :users, :email, unique: true<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u30c6\u30fc\u30d6\u30eb\u3067\u306e\u64cd\u4f5c\u6642\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8003\u616e\n<ul class=\"wp-block-list\">\n<li>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u542b\u3080\u30c6\u30fc\u30d6\u30eb\u3067\u306e\u30ab\u30e9\u30e0\u8ffd\u52a0\u3084\u524a\u9664\u306f\u3001\u9577\u6642\u9593\u306e\u30ed\u30c3\u30af\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u30b8\u30e7\u30d6\u3084\u30d0\u30c3\u30c1\u51e6\u7406\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u53ef\u9006\u7684\u306a\u5909\u66f4\u3092\u5fc3\u304c\u3051\u308b\n<ul class=\"wp-block-list\">\n<li><code>change<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u81ea\u52d5\u7684\u306b\u9006\u64cd\u4f5c\u304c\u751f\u6210\u3067\u304d\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u5909\u66f4\u306e\u5834\u5408\u306f<code>up<\/code>\u3068<code>down<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u660e\u793a\u7684\u306b\u5b9a\u7fa9\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30b3\u30e1\u30f3\u30c8\u306e\u8ffd\u52a0\n<ul class=\"wp-block-list\">\n<li>\u8907\u96d1\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u3001\u305d\u306e\u76ee\u7684\u3084\u5f71\u97ff\u3092\u8aac\u660e\u3059\u308b\u30b3\u30e1\u30f3\u30c8\u3092\u8ffd\u52a0\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AddEmailToUsers &lt; ActiveRecord::Migration[6.1]\n  def change\n    # \u30e6\u30fc\u30b6\u30fc\u8a8d\u8a3c\u306e\u305f\u3081\u306eemail\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\n    add_column :users, :email, :string, null: false\n    add_index :users, :email, unique: true\n  end\nend<\/pre>\n<\/div><\/div>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u64cd\u4f5c\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u9020\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u9032\u5316\u3092\u30b9\u30e0\u30fc\u30ba\u306b\u9032\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u969b\u306b\u5b9f\u884c\u3057\u3001\u7ba1\u7406\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-sgb-headings sgb-heading\" id=\"i-41\"><span class=\"sgb-heading__inner sgb-heading--type1 with-icon\" style=\"background-color:transparent;border-color:transparent;font-size:1.2em\"><i class=\"fa fa-check\" style=\"color:var(--wp--preset--color--sango-main)\"><\/i><span class=\"sgb-heading__text\" style=\"color:#333\">4. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3068\u7ba1\u7406\uff1a\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c6\u30af\u30cb\u30c3\u30af<\/span><\/span><\/h2>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u305f\u3089\u3001\u6b21\u306f\u305d\u308c\u3092\u5b9f\u884c\u3057\u3066\u5b9f\u969b\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5909\u66f4\u3092\u9069\u7528\u3057\u307e\u3059\u3002<br>\u3053\u3053\u3067\u306f\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3068\u7ba1\u7406\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-42\">rake db:migrate\u306e\u4f7f\u3044\u65b9\u3068\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-43\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h4>\n\n\n\n<p>\u6700\u3082\u57fa\u672c\u7684\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u30b3\u30de\u30f3\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">rake db:migrate<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001\u307e\u3060\u9069\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u3059\u3079\u3066\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u9806\u756a\u306b\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-44\">\u7279\u5b9a\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u307e\u3067\u5b9f\u884c<\/h4>\n\n\n\n<p>\u7279\u5b9a\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u307e\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bVERSION\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">rake db:migrate VERSION=20230905000000<\/pre>\n\n\n\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u6307\u5b9a\u3057\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\uff08\u3053\u306e\u4f8b\u3067\u306f2023\u5e749\u67085\u65e5\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\uff09\u307e\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#f88080;color:#FFF\" class=\"sgb-box-simple__title\"><i class=\"fas fa-exclamation-circle\"><\/i> \u6ce8\u610f\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#f88080;background-color:#ffebeb\">\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u884c\u9806\u5e8f\u306f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u306b\u57fa\u3065\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u65e2\u306b\u9069\u7528\u3055\u308c\u305f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u81ea\u52d5\u7684\u306b\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3001\u305d\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u51e6\u7406\u304c\u505c\u6b62\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-45\">\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u3068\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-46\">\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406<\/h4>\n\n\n\n<p>Rails\u306f<code>schema_migrations<\/code>\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001\u3069\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u9069\u7528\u3055\u308c\u305f\u304b\u3092\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u306b\u3088\u308a\u3001\u8907\u6570\u306e\u958b\u767a\u8005\u9593\u3067\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u72b6\u614b\u306e\u4e00\u8cab\u6027\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-47\">\u30ed\u30fc\u30eb\u30d0\u30c3\u30af<\/h4>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5143\u306b\u623b\u3059\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"i-48\">\u76f4\u524d\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30921\u3064\u623b\u3059<\/h5>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">  rake db:rollback<\/pre>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"i-49\">\u8907\u6570\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u623b\u3059<\/h5>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">  rake db:rollback STEP=3<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u76f4\u8fd1\u306e3\u3064\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u623b\u3057\u307e\u3059\u3002<br>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u76f4\u524d\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u30a8\u30e9\u30fc\u304c\u3042\u308a\u3001\u4fee\u6b63\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u9069\u7528\u3057\u305f\u5909\u66f4\u304c\u4e0d\u8981\u3060\u3068\u5224\u65ad\u3057\u305f\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-50\">\u305d\u306e\u4ed6\u306e\u6709\u7528\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u95a2\u9023\u30b3\u30de\u30f3\u30c9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-51\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u72b6\u614b\u78ba\u8a8d<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   rake db:migrate:status<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001\u3069\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u9069\u7528\u6e08\u307f\u3067\u3001\u3069\u308c\u304c\u30da\u30f3\u30c7\u30a3\u30f3\u30b0\u72b6\u614b\u304b\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-52\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u8a2d\u5b9a\u3068\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   rake db:setup<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u4f5c\u6210\u3001\u30b9\u30ad\u30fc\u30de\u306e\u8aad\u307f\u8fbc\u307f\u3001\u521d\u671f\u30c7\u30fc\u30bf\u306e\u6295\u5165\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-53\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30ea\u30bb\u30c3\u30c8<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   rake db:reset<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u524a\u9664\u3057\u3001\u518d\u4f5c\u6210\u3057\u305f\u5f8c\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u518d\u9069\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-54\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u3084\u308a\u76f4\u3057<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   rake db:migrate:redo<\/pre>\n\n\n\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001\u76f4\u524d\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3057\u3001\u518d\u5ea6\u9069\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-55\">\u74b0\u5883\u5225\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u65b9\u6cd5<\/h3>\n\n\n\n<p>Rails\u306e\u7570\u306a\u308b\u74b0\u5883\uff08\u958b\u767a\u3001\u30c6\u30b9\u30c8\u3001\u672c\u756a\uff09\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-56\">\u958b\u767a\u74b0\u5883<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">  rake db:migrate RAILS_ENV=development<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-57\">\u30c6\u30b9\u30c8\u74b0\u5883<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">  rake db:migrate RAILS_ENV=test<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-58\">\u672c\u756a\u74b0\u5883<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">  rake db:migrate RAILS_ENV=production<\/pre>\n\n\n\n<p>\u672c\u756a\u74b0\u5883\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u969b\u306f\u3001\u7279\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<br>\u30c7\u30fc\u30bf\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u53d6\u308a\u3001\u5341\u5206\u306a\u30c6\u30b9\u30c8\u3092\u884c\u3063\u305f\u5f8c\u306b\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3068\u7ba1\u7406\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u6398\u308a\u4e0b\u3052\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-sgb-headings sgb-heading\" id=\"i-59\"><span class=\"sgb-heading__inner sgb-heading--type1 with-icon\" style=\"background-color:transparent;border-color:transparent;font-size:1.2em\"><i class=\"fa fa-check\" style=\"color:var(--wp--preset--color--sango-main)\"><\/i><span class=\"sgb-heading__text\" style=\"color:#333\">5. \u9ad8\u5ea6\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30c6\u30af\u30cb\u30c3\u30af\uff1a\u8907\u96d1\u306a\u5909\u66f4\u3092\u52b9\u7387\u7684\u306b<\/span><\/span><\/h2>\n\n\n\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u6210\u9577\u3059\u308b\u306b\u3064\u308c\u3066\u3001\u3088\u308a\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<br>\u3053\u3053\u3067\u306f\u3001\u305d\u306e\u3088\u3046\u306a\u8907\u96d1\u306a\u5909\u66f4\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u305f\u3081\u306e\u9ad8\u5ea6\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-60\">\u30c7\u30fc\u30bf\u79fb\u884c\u3092\u542b\u3080\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u5909\u66f4\u306b\u4f34\u3044\u3001\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u3092\u65b0\u3057\u3044\u69cb\u9020\u306b\u79fb\u884c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5185\u3067SQL\u3084ActiveRecord\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u79fb\u884c\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001<code>users<\/code>\u30c6\u30fc\u30d6\u30eb\u304b\u3089<code>name<\/code>\u30ab\u30e9\u30e0\u3092\u5206\u5272\u3057\u3066<code>first_name<\/code>\u3068<code>last_name<\/code>\u306b\u3059\u308b\u5834\u5408<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SplitNameInUsers &lt; ActiveRecord::Migration[6.1]\n  def up\n    add_column :users, :first_name, :string\n    add_column :users, :last_name, :string\n\n    User.reset_column_information\n    User.find_each do |user|\n      name_parts = user.name.split(' ', 2)\n      user.update_columns(\n        first_name: name_parts[0],\n        last_name: name_parts[1] || ''\n      )\n    end\n\n    remove_column :users, :name\n  end\n\n  def down\n    add_column :users, :name, :string\n\n    User.reset_column_information\n    User.find_each do |user|\n      user.update_column(:name, \"#{user.first_name} #{user.last_name}\".strip)\n    end\n\n    remove_column :users, :first_name\n    remove_column :users, :last_name\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001<code>up<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u540d\u524d\u306e\u5206\u5272\u3092\u884c\u3044\u3001<code>down<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u5143\u306e\u72b6\u614b\u306b\u623b\u3059\u51e6\u7406\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-61\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u5834\u5408\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u306a\u8ab2\u984c\u3068\u306a\u308a\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u6d3b\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-62\">1. \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5229\u7528<\/h4>\n\n\n\n<p>\u5927\u91cf\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u51e6\u7406\u3059\u308b\u969b\u306f\u3001\u4e00\u5ea6\u306b\u3059\u3079\u3066\u3092\u51e6\u7406\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30d0\u30c3\u30c1\u306b\u5206\u3051\u3066\u51e6\u7406\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     User.find_in_batches(batch_size: 1000) do |group|\n       group.each { |user| user.do_something }\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-63\">2. \u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u306e\u4f7f\u7528<\/h4>\n\n\n\n<p>\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u79fb\u884c\u3092\u884c\u3046\u969b\u3001\u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u672c\u756a\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u5f71\u97ff\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     create_table :temp_users, temporary: true do |t|\n       t.string :email\n       t.string :hashed_password\n     end\n\n     execute &lt;&lt;-SQL\n       INSERT INTO temp_users (email, hashed_password)\n       SELECT email, MD5(password) FROM users\n     SQL\n\n     add_column :users, :hashed_password, :string\n     execute \"UPDATE users SET hashed_password = temp_users.hashed_password FROM temp_users WHERE users.email = temp_users.email\"\n     remove_column :users, :password\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-64\">3. \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4e00\u6642\u7684\u306a\u524a\u9664\u3068\u518d\u4f5c\u6210<\/h4>\n\n\n\n<p>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u633f\u5165\u3059\u308b\u969b\u306f\u3001\u4e00\u6642\u7684\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u524a\u9664\u3057\u3001\u30c7\u30fc\u30bf\u633f\u5165\u5f8c\u306b\u518d\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     remove_index :users, :email\n     # \u5927\u91cf\u306e\u30c7\u30fc\u30bf\u633f\u5165\u51e6\u7406\n     add_index :users, :email, unique: true\n   end<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-65\">\u8907\u96d1\u306a\u30b9\u30ad\u30fc\u30de\u5909\u66f4\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u8907\u96d1\u306a\u30b9\u30ad\u30fc\u30de\u5909\u66f4\u3092\u884c\u3046\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8907\u6570\u306e\u30b9\u30c6\u30c3\u30d7\u306b\u5206\u5272<br>\u5927\u304d\u306a\u5909\u66f4\u306f\u3001\u8907\u6570\u306e\u5c0f\u3055\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u5206\u5272\u3059\u308b\u3053\u3068\u3067\u3001\u30ea\u30b9\u30af\u3092\u8efd\u6e1b\u3057\u7ba1\u7406\u3092\u5bb9\u6613\u306b\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u306e\u5229\u7528<br>\u5927\u898f\u6a21\u306a\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u306e\u5909\u66f4\u3092\u884c\u3046\u969b\u3001\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u6d3b\u7528<br>\u95a2\u9023\u3059\u308b\u8907\u6570\u306e\u5909\u66f4\u3092\u30a2\u30c8\u30df\u30c3\u30af\u306b\u884c\u3046\u305f\u3081\u306b\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     transaction do\n       create_table :new_users do |t|\n         # \u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\n       end\n\n       execute &lt;&lt;-SQL\n         INSERT INTO new_users SELECT * FROM users\n       SQL\n\n       rename_table :users, :old_users\n       rename_table :new_users, :users\n     end\n   end<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-66\">\u6761\u4ef6\u4ed8\u304d\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4f5c\u6210<\/h3>\n\n\n\n<p>\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u3067\u306e\u307f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u3001\u6761\u4ef6\u5206\u5c90\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def change\n  if Rails.env.production?\n    add_index :users, :email, unique: true, algorithm: :concurrently\n  else\n    add_index :users, :email, unique: true\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u672c\u756a\u74b0\u5883\u3067\u306e\u307f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u540c\u6642\u5b9f\u884c\uff08<code>CONCURRENTLY<\/code>\uff09\u3067\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-67\">\u30ea\u30d0\u30fc\u30b7\u30d6\u30eb\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u91cd\u8981\u6027<\/h3>\n\n\n\n<p>\u30ea\u30d0\u30fc\u30b7\u30d6\u30eb\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u306a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<br><code>change<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u81ea\u52d5\u7684\u306b\u9006\u64cd\u4f5c\u304c\u751f\u6210\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u3001<code>up<\/code>\u3068<code>down<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u660e\u793a\u7684\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AddProductPriceHistory &lt; ActiveRecord::Migration[6.1]\n  def up\n    create_table :product_price_histories do |t|\n      t.references :product, foreign_key: true\n      t.decimal :price, precision: 10, scale: 2\n      t.datetime :changed_at\n    end\n\n    execute &lt;&lt;-SQL\n      INSERT INTO product_price_histories (product_id, price, changed_at)\n      SELECT id, price, updated_at FROM products\n    SQL\n  end\n\n  def down\n    drop_table :product_price_histories\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u3001\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u3092\u79fb\u884c\u3059\u308b<code>up<\/code>\u30e1\u30bd\u30c3\u30c9\u3068\u3001\u305d\u308c\u3092\u5143\u306b\u623b\u3059<code>down<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-68\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5185\u3067\u306eRuby\u30b3\u30fc\u30c9\u5b9f\u884c<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5185\u3067Ruby\u30b3\u30fc\u30c9\u3092\u76f4\u63a5\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u64cd\u4f5c\u3084\u6761\u4ef6\u5206\u5c90\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-69\">\u30e2\u30c7\u30eb\u306e\u5909\u66f4\u306b\u6ce8\u610f<\/h4>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u6642\u306e\u30e2\u30c7\u30eb\u306e\u72b6\u614b\u3068\u3001\u73fe\u5728\u306e\u30e2\u30c7\u30eb\u306e\u72b6\u614b\u304c\u7570\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<br><code>reset_column_information<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u6700\u65b0\u306e\u30b9\u30ad\u30fc\u30de\u60c5\u5831\u3092\u53cd\u6620\u3055\u305b\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     add_column :users, :full_name, :string\n\n     User.reset_column_information\n     User.find_each do |user|\n       user.update(full_name: \"#{user.first_name} #{user.last_name}\")\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-70\">\u9577\u6642\u9593\u5b9f\u884c\u306b\u6ce8\u610f<\/h4>\n\n\n\n<p>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u3001\u5b9f\u884c\u6642\u9593\u304c\u9577\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<br>\u30d0\u30c3\u30c1\u51e6\u7406\u3084\u975e\u540c\u671f\u51e6\u7406\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-71\">\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u91cd\u8981\u6027<\/h4>\n\n\n\n<p>\u30c7\u30fc\u30bf\u51e6\u7406\u4e2d\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306e\u5bfe\u51e6\u65b9\u6cd5\u3092\u8003\u616e\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     User.find_each do |user|\n       begin\n         user.complex_operation!\n       rescue =&gt; e\n         puts \"Error processing user #{user.id}: #{e.message}\"\n       end\n     end\n   end<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u3082\u52b9\u7387\u7684\u304b\u3064\u5b89\u5168\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u305f\u3060\u3057\u3001\u672c\u756a\u74b0\u5883\u3067\u306e\u5b9f\u884c\u306b\u306f\u5341\u5206\u306a\u6ce8\u610f\u3068\u4e8b\u524d\u306e\u30c6\u30b9\u30c8\u304c\u5fc5\u8981\u3067\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-sgb-headings sgb-heading\" id=\"i-72\"><span class=\"sgb-heading__inner sgb-heading--type1 with-icon\" style=\"background-color:transparent;border-color:transparent;font-size:1.2em\"><i class=\"fa fa-check\" style=\"color:var(--wp--preset--color--sango-main)\"><\/i><span class=\"sgb-heading__text\" style=\"color:#333\">6. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a\u30c1\u30fc\u30e0\u958b\u767a\u3067\u5f79\u7acb\u3064Tips<\/span><\/span><\/h2>\n\n\n\n<p>\u30c1\u30fc\u30e0\u958b\u767a\u306b\u304a\u3044\u3066\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u4e00\u8cab\u6027\u306e\u3042\u308b\u65b9\u6cd5\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306e\u9075\u5b88\u304c\u91cd\u8981\u3067\u3059\u3002<br>\u3053\u3053\u3067\u306f\u3001\u30c1\u30fc\u30e0\u958b\u767a\u3067\u7279\u306b\u5f79\u7acb\u3064\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306eTips\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-73\">\u547d\u540d\u898f\u5247\u3068\u4e00\u8cab\u6027\u306e\u7dad\u6301<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-74\">1. \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u547d\u540d\u898f\u5247<\/h4>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u547d\u540d\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u898f\u5247\u3092\u63a1\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">[\u52d5\u8a5e]_[\u540d\u8a5e]_to_[\u30c6\u30fc\u30d6\u30eb\u540d]<\/pre>\n\n\n\n<p>\u4ee5\u4e0b\u306b\u4f8b\u3092\u8a18\u8f09\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>add_email_to_users<\/code><\/li>\n\n\n\n<li><code>remove_password_from_accounts<\/code><\/li>\n\n\n\n<li><code>change_product_price_to_decimal<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u3053\u306e\u547d\u540d\u898f\u5247\u3092\u63a1\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u76ee\u7684\u304c\u4e00\u76ee\u3067\u5206\u304b\u308a\u3001\u30c1\u30fc\u30e0\u30e1\u30f3\u30d0\u30fc\u9593\u3067\u306e\u7406\u89e3\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-75\">2. \u4e00\u8cab\u6027\u306e\u7dad\u6301<\/h4>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4e00\u8cab\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u65b9\u6cd5\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b9\u30bf\u30a4\u30eb\u30ac\u30a4\u30c9\u306e\u4f5c\u6210\u3068\u9075\u5b88\uff1a\u30c1\u30fc\u30e0\u72ec\u81ea\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u4f5c\u6210\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u8a2d\u3051\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u5b9f\u65bd\uff1a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3082\u30ec\u30d3\u30e5\u30fc\u5bfe\u8c61\u3068\u3057\u3001\u54c1\u8cea\u3068\u4e00\u8cab\u6027\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u81ea\u52d5\u5316\u30c4\u30fc\u30eb\u306e\u4f7f\u7528\uff1aRuboCop\u306a\u3069\u306e\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3092\u7d71\u4e00\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-76\">\u53ef\u9006\u7684\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4f5c\u6210<\/h3>\n\n\n\n<p>\u53ef\u9006\u7684\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\uff08\u30ea\u30d0\u30fc\u30b7\u30d6\u30eb\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\uff09\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306f\u3001\u5b89\u5168\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u306e\u305f\u3081\u306b\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AddEmailToUsers &lt; ActiveRecord::Migration[6.1]\n  def up\n    add_column :users, :email, :string\n    add_index :users, :email, unique: true\n  end\n\n  def down\n    remove_index :users, :email\n    remove_column :users, :email\n  end\nend<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u53ef\u9006\u7684\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30e1\u30ea\u30c3\u30c83\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\">\n<li>\u5b89\u5168\u306a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\uff1a\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u3001\u7c21\u5358\u306b\u524d\u306e\u72b6\u614b\u306b\u623b\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u7dad\u6301\uff1a\u5909\u66f4\u3068\u305d\u306e\u53d6\u308a\u6d88\u3057\u304c\u660e\u78ba\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30c7\u30fc\u30bf\u306e\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u958b\u767a\u306e\u67d4\u8edf\u6027\u5411\u4e0a\uff1a\u8a66\u884c\u932f\u8aa4\u304c\u5bb9\u6613\u306b\u306a\u308a\u3001\u958b\u767a\u30d7\u30ed\u30bb\u30b9\u304c\u67d4\u8edf\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-77\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c6\u30b9\u30c8<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c6\u30b9\u30c8\u306f\u3001\u5b89\u5168\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u306e\u305f\u3081\u306b\u6b20\u304b\u305b\u307e\u305b\u3093\u3002<br>\u4ee5\u4e0b\u306e\u30c6\u30b9\u30c8\u65b9\u6cd5\u3092\u8003\u616e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-78\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u4f5c\u6210<\/h4>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u81ea\u4f53\u306e\u30ed\u30b8\u30c3\u30af\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   require 'test_helper'\n\n   class AddEmailToUsersTest &lt; ActiveSupport::TestCase\n     def setup\n       @migration = AddEmailToUsers.new\n     end\n\n     test \"migration adds email column to users\" do\n       @migration.up\n       assert_includes User.column_names, \"email\"\n     end\n\n     test \"migration removes email column from users\" do\n       @migration.down\n       refute_includes User.column_names, \"email\"\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-79\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u524d\u5f8c\u306e\u30c7\u30fc\u30bf\u691c\u8a3c<\/h4>\n\n\n\n<p>\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u304c\u6b63\u3057\u304f\u79fb\u884c\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-80\">\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u306e\u4e8b\u524d\u5b9f\u884c<\/h4>\n\n\n\n<p>\u672c\u756a\u74b0\u5883\u306b\u9069\u7528\u3059\u308b\u524d\u306b\u3001\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u5341\u5206\u306b\u30c6\u30b9\u30c8\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-81\">\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u7ba1\u7406\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u30104STEP\u3011<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\">\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5206\u5272<br>\u5927\u898f\u6a21\u306a\u5909\u66f4\u306f\u8907\u6570\u306e\u5c0f\u3055\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u5206\u5272\u3057\u3001\u7ba1\u7406\u3068\u30ec\u30d3\u30e5\u30fc\u3092\u5bb9\u6613\u306b\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u91cd\u8996<br>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u306e\u8a08\u753b\u3068\u5b9f\u884c\u306b\u3064\u3044\u3066\u3001\u30c1\u30fc\u30e0\u5185\u3067\u983b\u7e41\u306b\u60c5\u5831\u3092\u5171\u6709\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u306e\u5fb9\u5e95<br>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\uff08Git\u7b49\uff09\u3067\u9069\u5207\u306b\u7ba1\u7406\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u5b9a\u671f\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u540c\u671f<br>\u958b\u767a\u74b0\u5883\u3068\u30b9\u30c6\u30fc\u30b8\u30f3\u30b0\u74b0\u5883\u306e\u30b9\u30ad\u30fc\u30de\u3092\u5b9a\u671f\u7684\u306b\u672c\u756a\u74b0\u5883\u3068\u540c\u671f\u3055\u305b\u3001\u4e0d\u6574\u5408\u3092\u9632\u304e\u307e\u3059\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-82\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u306f\u3001\u30c1\u30fc\u30e0\u306e\u7406\u89e3\u4fc3\u9032\u3068\u5c06\u6765\u306e\u4fdd\u5b88\u6027\u5411\u4e0a\u306e\u305f\u3081\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-83\">\u30b3\u30e1\u30f3\u30c8\u306e\u6d3b\u7528<\/h4>\n\n\n\n<p>\u8907\u96d1\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u3001\u305d\u306e\u76ee\u7684\u3084\u5f71\u97ff\u3092\u8aac\u660e\u3059\u308b\u30b3\u30e1\u30f3\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   class AddUserRoles &lt; ActiveRecord::Migration[6.1]\n     def change\n       # \u30e6\u30fc\u30b6\u30fc\u306e\u6a29\u9650\u7ba1\u7406\u306e\u305f\u3081\u306eroles\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\n       # \u5024\u306f\u914d\u5217\u3068\u3057\u3066\u4fdd\u5b58\u3055\u308c\u3001\u8907\u6570\u306e\u5f79\u5272\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u308b\n       add_column :users, :roles, :string, array: true, default: []\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-84\">README\u30d5\u30a1\u30a4\u30eb\u306e\u66f4\u65b0<\/h4>\n\n\n\n<p>\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5909\u66f4\u306b\u3064\u3044\u3066\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306eREADME\u30d5\u30a1\u30a4\u30eb\u306b\u8a18\u8f09\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-85\">ER\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u306e\u7dad\u6301<\/h4>\n\n\n\n<p>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u306e\u5909\u66f4\u3092\u53cd\u6620\u3057\u305fER\u30c0\u30a4\u30a2\u30b0\u30e9\u30e0\u3092\u5b9a\u671f\u7684\u306b\u66f4\u65b0\u3057\u3001\u6700\u65b0\u306e\u72b6\u614b\u3092\u4fdd\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9075\u5b88\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u958b\u767a\u306b\u304a\u3051\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u7ba1\u7406\u304c\u30b9\u30e0\u30fc\u30ba\u306b\u306a\u308a\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u54c1\u8cea\u3068\u52b9\u7387\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u95a2\u9023\u3059\u308b\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u7b56\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-86\">7. \u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\uff1a\u3088\u304f\u3042\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u4e2d\u306b\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u306f\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u3088\u304f\u3042\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u554f\u984c\u3068\u305d\u306e\u89e3\u6c7a\u7b56\u3001\u3055\u3089\u306b\u554f\u984c\u3092\u4e88\u9632\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-87\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-88\">Table already exists\uff08\u30c6\u30fc\u30d6\u30eb\u304c\u65e2\u306b\u5b58\u5728\u3059\u308b\uff09<\/h4>\n\n\n\n<p>\u539f\u56e0\uff1a\u540c\u540d\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u65e2\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5b58\u5728\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5bfe\u51e6\u6cd5\uff1a<code>create_table<\/code>\u30e1\u30bd\u30c3\u30c9\u306b<code>if_not_exists: true<\/code>\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">create_table :users, if_not_exists: true do |t|\n  # \u30c6\u30fc\u30d6\u30eb\u5b9a\u7fa9\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-89\">Column already exists\uff08\u30ab\u30e9\u30e0\u304c\u65e2\u306b\u5b58\u5728\u3059\u308b\uff09<\/h4>\n\n\n\n<p>\u539f\u56e0\uff1a\u540c\u540d\u306e\u30ab\u30e9\u30e0\u304c\u65e2\u306b\u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5bfe\u51e6\u6cd5\uff1a<code>add_column<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def change\n  unless column_exists?(:users, :email)\n    add_column :users, :email, :string\n  end\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-90\">Mysql2::Error: Specified key was too long\uff08\u6307\u5b9a\u3055\u308c\u305f\u30ad\u30fc\u304c\u9577\u3059\u304e\u308b\uff09<\/h4>\n\n\n\n<p>\u539f\u56e0\uff1aMySQL\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ad\u30fc\u304c\u9577\u3059\u304e\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5bfe\u51e6\u6cd5\uff1a\u30ab\u30e9\u30e0\u306e\u9577\u3055\u3092\u5236\u9650\u3059\u308b\u304b\u3001\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">add_column :users, :email, :string, limit: 255\nadd_index :users, :email, length: 191<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-91\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\u306e\u4e88\u9632\u7b56<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u306e\u4e8b\u524d\u5b9f\u884c<br>\u672c\u756a\u74b0\u5883\u306b\u9069\u7528\u3059\u308b\u524d\u306b\u3001\u5fc5\u305a\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3057\u3001\u554f\u984c\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u306e\u5fb9\u5e95<br>\u3059\u3079\u3066\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u9069\u5207\u306b\u7ba1\u7406\u3057\u3001\u30c1\u30fc\u30e0\u5185\u3067\u6700\u65b0\u306e\u72b6\u614b\u3092\u5171\u6709\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u5b9f\u65bd<br>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3082\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u5bfe\u8c61\u3068\u3057\u3001\u6f5c\u5728\u7684\u306a\u554f\u984c\u3092\u65e9\u671f\u306b\u767a\u898b\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-92\">\u672c\u756a\u74b0\u5883\u3067\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u6642\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u4f5c\u6210<br>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u524d\u306b\u3001\u5fc5\u305a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30d5\u30eb\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u30e2\u30fc\u30c9\u306e\u4f7f\u7528<br>\u30c7\u30fc\u30bf\u6574\u5408\u6027\u3092\u4fdd\u3064\u305f\u3081\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u4e2d\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u30e2\u30fc\u30c9\u306b\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u6bb5\u968e\u7684\u306a\u9069\u7528<br>\u5927\u898f\u6a21\u306a\u5909\u66f4\u306e\u5834\u5408\u3001\u8907\u6570\u306e\u5c0f\u3055\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u5206\u5272\u3057\u3066\u6bb5\u968e\u7684\u306b\u9069\u7528\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u5b9f\u884c\u6642\u9593\u306e\u8003\u616e<br>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5834\u5408\u3001\u5b9f\u884c\u6642\u9593\u3092\u898b\u7a4d\u3082\u308a\u3001\u9069\u5207\u306a\u5b9f\u884c\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-93\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u65b9\u6cd5\u3068\u305d\u306e\u969b\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>\u57fa\u672c\u7684\u306a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">rake db:rollback<\/pre>\n\n\n\n<p>\u8907\u6570\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u623b\u3059\u5834\u5408<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">rake db:rollback STEP=n<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:#f88080;color:#FFF\" class=\"sgb-box-simple__title\"><i class=\"fas fa-exclamation-circle\"><\/i> \u6ce8\u610f\u70b9<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:#f88080;background-color:#ffebeb\">\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u640d\u5931\u306e\u53ef\u80fd\u6027\uff1a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306b\u3088\u3063\u3066\u30c7\u30fc\u30bf\u304c\u5931\u308f\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u53d6\u3063\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/li>\n\n\n\n<li>\u95a2\u9023\u3059\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u9806\u5e8f\uff1a\u8907\u6570\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u76f8\u4e92\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u9806\u5e8f\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-94\">\u8907\u96d1\u306a\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-95\">puts\u6587\u306e\u4f7f\u7528<\/h4>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5185\u3067<code>puts<\/code>\u6587\u3092\u4f7f\u7528\u3057\u3066\u3001\u51e6\u7406\u306e\u9032\u884c\u72b6\u6cc1\u3084\u5909\u6570\u306e\u5024\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     User.find_each do |user|\n       puts \"Processing user: #{user.id}\"\n       # \u51e6\u7406\u5185\u5bb9\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-96\">logger.debug\u306e\u6d3b\u7528<\/h4>\n\n\n\n<p>Rails\u306e\u30ed\u30ac\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3001\u3088\u308a\u8a73\u7d30\u306a\u30c7\u30d0\u30c3\u30b0\u60c5\u5831\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   def change\n     User.find_each do |user|\n       logger.debug \"Updating user: #{user.attributes}\"\n       # \u51e6\u7406\u5185\u5bb9\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-97\">binding.pry\u306e\u633f\u5165<\/h4>\n\n\n\n<p><code>pry<\/code>gem\u3092\u4f7f\u7528\u3057\u3066\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u4e2d\u306b\u5bfe\u8a71\u7684\u30c7\u30d0\u30c3\u30b0\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   require 'pry'\n\n   def change\n     User.find_each do |user|\n       binding.pry\n       # \u51e6\u7406\u5185\u5bb9\n     end\n   end<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-98\">\u30b9\u30ad\u30fc\u30de\u60c5\u5831\u306e\u78ba\u8a8d<\/h4>\n\n\n\n<p><code>db\/schema.rb<\/code>\u30d5\u30a1\u30a4\u30eb\u3092\u78ba\u8a8d\u3057\u3066\u3001\u73fe\u5728\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u628a\u63e1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u6280\u8853\u3092\u8eab\u306b\u3064\u3051\u308b\u3053\u3068\u3067\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u95a2\u3059\u308b\u554f\u984c\u3092\u52b9\u7387\u7684\u306b\u89e3\u6c7a\u3057\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u3092\u3088\u308a\u5b89\u5168\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u307e\u3067\u306e\u5185\u5bb9\u3092\u307e\u3068\u3081\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30de\u30b9\u30bf\u30fc\u306b\u306a\u308b\u305f\u3081\u306e\u9053\u7b4b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-99\">8. \u307e\u3068\u3081\uff1aDB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30de\u30b9\u30bf\u30fc\u3078\u306e\u9053<\/h2>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Ruby on Rails\u306eDB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u3001\u57fa\u672c\u304b\u3089\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u5e45\u5e83\u304f\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002<br>\u3053\u3053\u3067\u6539\u3081\u3066\u4e3b\u8981\u30dd\u30a4\u30f3\u30c8\u3092\u632f\u308a\u8fd4\u308a\u3001\u4eca\u5f8c\u306e\u5b66\u7fd2\u306e\u9053\u7b4b\u3092\u793a\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-100\">\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u304c\u3082\u305f\u3089\u3059\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n\n\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u7ba1\u7406\u306e\u30e1\u30ea\u30c3\u30c84\u9078<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\">\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b89\u5b9a\u6027\u5411\u4e0a\uff1a\u30b9\u30ad\u30fc\u30de\u306e\u5909\u66f4\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u3067\u3001\u4e88\u671f\u305b\u306c\u30a8\u30e9\u30fc\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u958b\u767a\u52b9\u7387\u306e\u6539\u5584\uff1a\u30c1\u30fc\u30e0\u5168\u4f53\u3067\u4e00\u8cab\u3057\u305f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u5354\u50cd\u306e\u4fc3\u9032\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5909\u66f4\u5c65\u6b74\u304c\u660e\u78ba\u306b\u306a\u308a\u3001\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u5186\u6ed1\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306e\u78ba\u4fdd\uff1a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6210\u9577\u306b\u5408\u308f\u305b\u3066\u3001\u67d4\u8edf\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u9032\u5316\u3055\u305b\u3089\u308c\u307e\u3059\u3002<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-101\">\u7d99\u7d9a\u7684\u306a\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9\u3068\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u53c2\u52a0\u306e\u91cd\u8981\u6027<\/h3>\n\n\n\n<p>DB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30b9\u30ad\u30eb\u3092\u78e8\u304d\u7d9a\u3051\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u30ea\u30bd\u30fc\u30b9\u3068\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u6d3b\u52d5\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-102\">\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ruby on Rails\u516c\u5f0f\u30ac\u30a4\u30c9\uff1a\u5e38\u306b\u6700\u65b0\u306e\u60c5\u5831\u304c\u63b2\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n\n\n\n<li>RailsConf\u8b1b\u6f14\u52d5\u753b\uff1a\u30a8\u30ad\u30b9\u30d1\u30fc\u30c8\u306e\u77e5\u898b\u3092\u5b66\u3079\u307e\u3059\u3002<\/li>\n\n\n\n<li>Ruby on Rails\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30d6\u30ed\u30b0\uff1a\u5b9f\u8df5\u7684\u306aTips\u304c\u8c4a\u5bcc\u3067\u3059\u3002<\/li>\n\n\n\n<li>\u30aa\u30f3\u30e9\u30a4\u30f3\u30b3\u30fc\u30b9\uff08Udemy, Coursera\u7b49\uff09\uff1a\u4f53\u7cfb\u7684\u306b\u5b66\u7fd2\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-103\">\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u53c2\u52a0<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>GitHub\u3067\u306e\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3078\u306e\u8ca2\u732e\uff1a\u5b9f\u8df5\u7684\u306a\u30b9\u30ad\u30eb\u304c\u8eab\u306b\u3064\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li>Stack Overflow\u3067\u306e\u8cea\u554f\u3068\u56de\u7b54\uff1a\u69d8\u3005\u306a\u554f\u984c\u89e3\u6c7a\u65b9\u6cd5\u3092\u5b66\u3079\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u5730\u57df\u306eRuby on Rails Meetup\u3078\u306e\u53c2\u52a0\uff1a\u76f4\u63a5\u30a8\u30ad\u30b9\u30d1\u30fc\u30c8\u3068\u4ea4\u6d41\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306b\u53c2\u52a0\u3059\u308b\u3053\u3068\u3067\u3001\u6700\u65b0\u60c5\u5831\u306e\u5165\u624b\u3001\u554f\u984c\u89e3\u6c7a\u306e\u652f\u63f4\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30ad\u30f3\u30b0\u306a\u3069\u3001\u591a\u304f\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-104\">Ruby on Rails\u3068ActiveRecord\u306e\u672a\u6765<\/h3>\n\n\n\n<p>Ruby on Rails\u3068ActiveRecord\u306f\u5e38\u306b\u9032\u5316\u3092\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002\u4eca\u5f8c\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u767a\u5c55\u304c\u671f\u5f85\u3055\u308c\u307e\u3059<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u9032\u5316\uff1a\u3088\u308a\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u6539\u5584\u304c\u9032\u3080\u3067\u3057\u3087\u3046\u3002<\/li>\n\n\n\n<li>NoSQL\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u7d71\u5408\u5f37\u5316\uff1a\u591a\u69d8\u306a\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306b\u67d4\u8edf\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/li>\n\n\n\n<li>AI\u3092\u6d3b\u7528\u3057\u305f\u30b9\u30ad\u30fc\u30de\u8a2d\u8a08\u652f\u63f4\uff1a\u6700\u9069\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u63d0\u6848\u3057\u3066\u304f\u308c\u308b\u6a5f\u80fd\u304c\u767b\u5834\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n\n\n\n<p>DB\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001Ruby on Rails\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306e\u91cd\u8981\u306a\u4e00\u90e8\u3067\u3059\u3002<br>\u3053\u306e\u8a18\u4e8b\u3067\u5b66\u3093\u3060\u77e5\u8b58\u3092\u6d3b\u304b\u3057\u3001\u5b9f\u8df5\u3092\u91cd\u306d\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u67d4\u8edf\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<br>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30de\u30b9\u30bf\u30fc\u3078\u306e\u9053\u306f\u3001\u65e5\u3005\u306e\u5c0f\u3055\u306a\u7a4d\u307f\u91cd\u306d\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002<br>\u3055\u3042\u3001\u3042\u306a\u305f\u3082\u4eca\u65e5\u304b\u3089\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u65c5\u3092\u59cb\u3081\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ruby on Rails\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6210\u9577\u306b\u5408\u308f\u305b\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u521d\u5fc3\u8005\u304b\u3089\u4e0a\u7d1a\u8005\u307e\u3067\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u57fa\u790e\u304b\u3089\u9ad8\u5ea6\u306a\u30c6\u30af &#8230; <\/p>\n","protected":false},"author":1,"featured_media":3167,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,44],"tags":[],"class_list":{"0":"post-59","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-ruby","8":"category-ruby-rails"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/59","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=59"}],"version-history":[{"count":4,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/59\/revisions"}],"predecessor-version":[{"id":93,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/59\/revisions\/93"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/media\/3167"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=59"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=59"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=59"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}