{"id":1513,"date":"2025-03-24T08:50:32","date_gmt":"2025-03-23T23:50:32","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1513"},"modified":"2025-03-24T08:50:32","modified_gmt":"2025-03-23T23:50:32","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91ruby%e3%81%aeselect%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%82%92%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e5%ae%9f%e8%b7%b5%e7%9a%84","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1513","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Ruby\u306eselect\u30e1\u30bd\u30c3\u30c9\u3092\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u30685\u3064\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\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\">select\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u914d\u5217\u304b\u3089\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u62bd\u51fa\u3059\u308b\u4ed5\u7d44\u307f<\/a>      <\/li>      <li>        <a href=\"#i-2\">select\u3068select\u306e\u30d6\u30ed\u30c3\u30af\u5f62\u5f0f\u306e\u9055\u3044<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u623b\u308a\u5024\u306e\u7279\u5fb4\u3068\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">\u5b9f\u8df5\u7684\u306aselect\u306e\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u8907\u6570\u306e\u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u9ad8\u5ea6\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u30cd\u30b9\u30c8\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">select\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u30b3\u30c4<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u610f\u8b58\u3057\u305f\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">select\u3068find_all\u306e\u4f7f\u3044\u5206\u3051<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">ActiveRecord\u3067\u306eselect\u6d3b\u7528\u8853<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8ca0\u8377\u306e\u6700\u9069\u5316\u624b\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-14\">N+1\u554f\u984c\u3092\u56de\u907f\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u30b9\u30b3\u30fc\u30d7\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">\u5b9f\u52d9\u3067\u3088\u304f\u3042\u308b\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u30d0\u30c3\u30c1\u51e6\u7406\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u30c7\u30fc\u30bf\u51e6\u7406\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-20\">select\u30e1\u30bd\u30c3\u30c9\u306e\u30c6\u30b9\u30c8\u624b\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">\u5358\u4f53\u30c6\u30b9\u30c8\u306e\u66f8\u304d\u65b9\u3068\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-22\">\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u30c6\u30b9\u30c8\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-23\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5\u65b9\u6cd5<\/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-heading\" id=\"i-0\">select\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u914d\u5217\u304b\u3089\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u62bd\u51fa\u3059\u308b\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p>Ruby\u306eselect\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u304b\u3089\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u62bd\u51fa\u3059\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u5185\u90e8\u7684\u306b\u306f\u3001\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u30d6\u30ed\u30c3\u30af\u3092\u8a55\u4fa1\u3057\u3001\u305d\u306e\u7d50\u679c\u304c\u771f\u3068\u306a\u308b\u8981\u7d20\u306e\u307f\u3092\u542b\u3080\u65b0\u3057\u3044\u914d\u5217\u3092\u8fd4\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=\"\"># \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\uff1a\u5076\u6570\u306e\u307f\u3092\u62bd\u51fa\nnumbers = [1, 2, 3, 4, 5]\neven_numbers = numbers.select { |n| n.even? }\n# =&gt; [2, 4]\n\n# \u8907\u6570\u306e\u6761\u4ef6\uff1a3\u3088\u308a\u5927\u304d\u3044\u5076\u6570\u3092\u62bd\u51fa\nnumbers = [1, 2, 3, 4, 5, 6]\nresult = numbers.select { |n| n &gt; 3 &amp;&amp; n.even? }\n# =&gt; [4, 6]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">select\u3068select\u306e\u30d6\u30ed\u30c3\u30af\u5f62\u5f0f\u306e\u9055\u3044<\/h3>\n\n\n\n<p>select\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001\u30d6\u30ed\u30c3\u30af\u5f62\u5f0f\u3068\u30b7\u30f3\u30dc\u30eb\u5f62\u5f0f\u306e2\u3064\u306e\u8a18\u6cd5\u304c\u3042\u308a\u307e\u3059\uff1a<\/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=\"\"># 1. \u30d6\u30ed\u30c3\u30af\u5f62\u5f0f\nusers = ['Alice', 'Bob', 'Charlie']\nlong_names = users.select { |name| name.length &gt; 4 }\n# =&gt; [\"Alice\", \"Charlie\"]\n\n# 2. \u30b7\u30f3\u30dc\u30eb\u5f62\u5f0f\uff08\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\uff09\nnumbers = [0, 1, 2, 3, 4]\npositive_numbers = numbers.select(&amp;:positive?)\n# =&gt; [1, 2, 3, 4]\n\n# 3. do...end\u5f62\u5f0f\uff08\u8907\u6570\u884c\u306e\u51e6\u7406\uff09\nusers = [\n  { name: 'Alice', age: 25 },\n  { name: 'Bob', age: 30 },\n  { name: 'Charlie', age: 35 }\n]\nadult_users = users.select do |user|\n  user[:age] &gt;= 30\nend\n# =&gt; [{:name=&gt;\"Bob\", :age=&gt;30}, {:name=&gt;\"Charlie\", :age=&gt;35}]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u623b\u308a\u5024\u306e\u7279\u5fb4\u3068\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>select\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u91cd\u8981\u306a\u7279\u5fb4\u3068\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u65b0\u3057\u3044\u914d\u5217\u306e\u751f\u6210<\/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=\"\"># \u5143\u306e\u914d\u5217\u306f\u5909\u66f4\u3055\u308c\u306a\u3044\noriginal = [1, 2, 3, 4, 5]\nfiltered = original.select { |n| n.even? }\nputs original  # =&gt; [1, 2, 3, 4, 5]\nputs filtered  # =&gt; [2, 4]<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u304c\u306a\u3044\u5834\u5408<\/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=\"\"># \u7a7a\u914d\u5217\u304c\u8fd4\u3055\u308c\u308b\nnumbers = [1, 3, 5]\neven_numbers = numbers.select { |n| n.even? }\n# =&gt; []<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>select\u3068select!\u306e\u9055\u3044<\/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=\"\"># select!\u306f\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\nnumbers = [1, 2, 3, 4, 5]\nresult = numbers.select! { |n| n.even? }\nputs numbers  # =&gt; [2, 4]\nputs result   # =&gt; [2, 4]\n\n# \u5909\u66f4\u304c\u306a\u3044\u5834\u5408\u306fnil\u3092\u8fd4\u3059\nnumbers = [2, 4, 6]\nresult = numbers.select! { |n| n.even? }\nputs result   # =&gt; nil<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u5229\u7528<\/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=\"\"># \u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u53ef\u80fd\nresult = [1, 2, 3, 4, 5]\n  .select { |n| n.even? }\n  .map { |n| n * 2 }\n# =&gt; [4, 8]<\/pre>\n\n\n\n<p>select\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u3053\u308c\u3089\u306e\u7279\u5fb4\u3092\u7406\u89e3\u3057\u3001\u76ee\u7684\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u4f7f\u3044\u65b9\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u3001\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e<code>select!<\/code>\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u5143\u306e\u914d\u5217\u304c\u5909\u66f4\u3055\u308c\u308b\u3053\u3068\u3092\u610f\u8b58\u3057\u3066\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">\u5b9f\u8df5\u7684\u306aselect\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u8907\u6570\u306e\u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u9ad8\u5ea6\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306f\u3001\u8907\u6570\u306e\u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u8907\u96d1\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3092\u884c\u3046\u3053\u3068\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u3067\u306f\u3001\u69d8\u3005\u306a\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9\u3092\u89e3\u8aac\u3057\u307e\u3059\uff1a<\/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=\"\"># \u8907\u6570\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\nusers = [\n  { name: 'Alice', age: 25, active: true },\n  { name: 'Bob', age: 30, active: false },\n  { name: 'Charlie', age: 35, active: true }\n]\n\n# AND\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\nactive_adults = users.select do |user|\n  user[:age] &gt;= 30 &amp;&amp; user[:active]\nend\n# =&gt; [{:name=&gt;\"Charlie\", :age=&gt;35, :active=&gt;true}]\n\n# OR\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\ntarget_users = users.select do |user|\n  user[:age] &lt; 30 || !user[:active]\nend\n# =&gt; [{:name=&gt;\"Alice\", :age=&gt;25, :active=&gt;true}, \n#     {:name=&gt;\"Bob\", :age=&gt;30, :active=&gt;false}]\n\n# \u6b63\u898f\u8868\u73fe\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\nusers_with_a = users.select { |user| user[:name] =~ \/^A\/ }\n# =&gt; [{:name=&gt;\"Alice\", :age=&gt;25, :active=&gt;true}]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>select\u30e1\u30bd\u30c3\u30c9\u306f\u4ed6\u306eEnumerable\u30e1\u30bd\u30c3\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\uff1a<\/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=\"\">data = [\n  { id: 1, value: 10 },\n  { id: 2, value: 20 },\n  { id: 3, value: 30 },\n  { id: 4, value: 40 }\n]\n\n# select \u2192 map\u306e\u7d44\u307f\u5408\u308f\u305b\nresult = data\n  .select { |item| item[:value] &gt; 20 }  # \u6761\u4ef6\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n  .map { |item| item[:value] * 2 }      # \u5024\u30922\u500d\u306b\n# =&gt; [60, 80]\n\n# select \u2192 each_with_object\u306e\u7d44\u307f\u5408\u308f\u305b\nsummary = data\n  .select { |item| item[:value] &gt;= 20 }\n  .each_with_object({}) do |item, hash|\n    hash[item[:id]] = item[:value]\n  end\n# =&gt; {2=&gt;20, 3=&gt;30, 4=&gt;40}\n\n# select \u2192 reduce(inject)\u306e\u7d44\u307f\u5408\u308f\u305b\ntotal = data\n  .select { |item| item[:value] &gt; 20 }\n  .reduce(0) { |sum, item| sum + item[:value] }\n# =&gt; 70<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u30cd\u30b9\u30c8\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u306e\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306f\u3001\u8907\u96d1\u306b\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u6271\u3046\u3053\u3068\u3082\u591a\u304f\u3042\u308a\u307e\u3059\uff1a<\/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=\"\"># \u30cd\u30b9\u30c8\u3055\u308c\u305f\u914d\u5217\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nteams = [\n  {\n    name: 'Team A',\n    members: [\n      { name: 'Alice', role: 'developer' },\n      { name: 'Bob', role: 'designer' }\n    ]\n  },\n  {\n    name: 'Team B',\n    members: [\n      { name: 'Charlie', role: 'developer' },\n      { name: 'David', role: 'manager' }\n    ]\n  }\n]\n\n# \u958b\u767a\u8005\u304c\u3044\u308b\u30c1\u30fc\u30e0\u3092\u62bd\u51fa\ndev_teams = teams.select do |team|\n  team[:members].any? { |member| member[:role] == 'developer' }\nend\n\n# \u30cd\u30b9\u30c8\u3055\u308c\u305f\u30cf\u30c3\u30b7\u30e5\u306e\u6761\u4ef6\u4ed8\u304d\u62bd\u51fa\ncomplex_data = [\n  {\n    id: 1,\n    details: {\n      category: 'A',\n      status: { active: true, priority: 'high' }\n    }\n  },\n  {\n    id: 2,\n    details: {\n      category: 'B',\n      status: { active: false, priority: 'low' }\n    }\n  }\n]\n\n# \u6df1\u3044\u30cd\u30b9\u30c8\u306e\u6761\u4ef6\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nactive_high_priority = complex_data.select do |item|\n  item.dig(:details, :status, :active) &amp;&amp; \n  item.dig(:details, :status, :priority) == 'high'\nend\n# =&gt; [{:id=&gt;1, :details=&gt;{:category=&gt;\"A\", :status=&gt;{:active=&gt;true, :priority=&gt;\"high\"}}}]<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u8981\u4ef6\u306b\u3082\u67d4\u8edf\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5b9f\u52d9\u3067\u306f\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u8003\u616e\u3057\u306a\u304c\u3089\u3001\u9069\u5207\u306a\u65b9\u6cd5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">select\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u30b3\u30c4<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u6271\u3046\u969b\u306f\u3001select\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3088\u3063\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5927\u304d\u304f\u5909\u308f\u3063\u3066\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u8981\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/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 'benchmark'\n\n# \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u4f5c\u6210\nlarge_array = (1..1000000).to_a\nusers = large_array.map { |i| { id: i, active: i.even? } }\n\n# 1. \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u306e\u6d3b\u7528\ndef slow_filter(users)\n  users.select do |user|\n    complex_calculation1(user) &amp;&amp;\n    complex_calculation2(user) &amp;&amp;\n    complex_calculation3(user)\n  end\nend\n\ndef optimized_filter(users)\n  users.select do |user|\n    # \u8efd\u3044\u51e6\u7406\u3092\u5148\u306b\u5b9f\u884c\n    return false unless user[:active]\n    # \u91cd\u3044\u51e6\u7406\u306f\u5fc5\u8981\u306a\u6642\u3060\u3051\u5b9f\u884c\n    complex_calculation1(user) &amp;&amp;\n    complex_calculation2(user)\n  end\nend\n\n# 2. \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u6d3b\u7528\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\ndef index_based_filter(users)\n  lookup = users.each_with_object({}) do |user, hash|\n    hash[user[:id]] = user\n  end\n\n  target_ids = [1, 100, 1000]\n  target_ids.map { |id| lookup[id] }.compact\nend\n\n# 3. \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6d3b\u7528\ndef batch_processing(users, batch_size = 1000)\n  result = []\n  users.each_slice(batch_size) do |batch|\n    result.concat(\n      batch.select { |user| user[:active] }\n    )\n  end\n  result\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u610f\u8b58\u3057\u305f\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6291\u3048\u308b\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/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=\"\"># 1. Enumerator\u306e\u6d3b\u7528\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\ndef memory_efficient_select(enumerable)\n  Enumerator.new do |yielder|\n    enumerable.each do |element|\n      yielder &lt;&lt; element if element.even?\n    end\n  end\nend\n\n# 2. find_each\u306e\u6d3b\u7528\uff08ActiveRecord\u306e\u5834\u5408\uff09\ndef process_large_dataset\n  User.find_each(batch_size: 1000) do |user|\n    # \u5404\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3059\u308b\u51e6\u7406\n  end\nend\n\n# 3. \u5fc5\u8981\u306a\u5c5e\u6027\u306e\u307f\u9078\u629e\nclass User &lt; ApplicationRecord\n  def self.active_users_optimized\n    select(:id, :name, :active)\n      .where(active: true)\n  end\nend<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\uff1a<\/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 'benchmark'\n\narray = (1..1000000).to_a\n\nBenchmark.bm do |x|\n  x.report(\"\u901a\u5e38\u306eselect:\") do\n    array.select { |n| n.even? }\n  end\n\n  x.report(\"Enumerator\u4f7f\u7528:\") do\n    memory_efficient_select(array).force\n  end\n\n  x.report(\"\u30d0\u30c3\u30c1\u51e6\u7406:\") do\n    batch_processing(array)\n  end\nend\n\n# \u5b9f\u884c\u7d50\u679c\u4f8b\uff1a\n#                    user     system      total        real\n# \u901a\u5e38\u306eselect:      0.120000   0.010000   0.130000 (  0.131424)\n# Enumerator\u4f7f\u7528:    0.100000   0.000000   0.100000 (  0.103301)\n# \u30d0\u30c3\u30c1\u51e6\u7406:        0.150000   0.010000   0.160000 (  0.158712)<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">select\u3068find_all\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p>select\u3068find_all\u306e\u7279\u5fb4\u3068\u4f7f\u3044\u5206\u3051\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\uff1a<\/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=\"\"># select\u306e\u5834\u5408\n# \u30e1\u30e2\u30ea\u4e0a\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nusers = [\n  { name: 'Alice', age: 25 },\n  { name: 'Bob', age: 30 }\n]\n\nyoung_users = users.select { |u| u[:age] &lt; 30 }\n# \u30e1\u30e2\u30ea\u4e0a\u3067\u5168\u4ef6\u53d6\u5f97\u3057\u3066\u304b\u3089\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n\n# find_all\uff08ActiveRecord\uff09\u306e\u5834\u5408\n# DB\u30ec\u30d9\u30eb\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nyoung_users = User.find_all { |u| u.age &lt; 30 }\n# SQL\u3067WHERE\u53e5\u304c\u751f\u6210\u3055\u308c\u308b\n\n# \u4f7f\u3044\u5206\u3051\u306e\u6307\u91dd\n# 1. \u30e1\u30e2\u30ea\u4e0a\u306e\u914d\u5217\u64cd\u4f5c \u2192 select\narray_result = [1, 2, 3, 4, 5].select(&amp;:even?)\n\n# 2. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea \u2192 where + find_each\nUser.where(active: true).find_each do |user|\n  # \u51e6\u7406\nend<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u306e\u7279\u6027\u3092\u7406\u89e3\u3059\u308b<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba<\/li>\n\n\n\n<li>\u30a2\u30af\u30bb\u30b9\u983b\u5ea6<\/li>\n\n\n\n<li>\u66f4\u65b0\u983b\u5ea6<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u5b9f\u88c5\u65b9\u6cd5\u306e\u9078\u629e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u5236\u7d04\u304c\u3042\u308b\u5834\u5408\u306fEnumerator\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306f\u30d0\u30c3\u30c1\u51e6\u7406\u3092\u691c\u8a0e<\/li>\n\n\n\n<li>DB\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\u306a\u5834\u5408\u306ffind_each\u3092\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u5b9a\u671f\u7684\u306b\u5b9f\u65bd<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996<\/li>\n\n\n\n<li>\u5b9f\u884c\u6642\u9593\u306e\u8a08\u6e2c<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">ActiveRecord\u3067\u306eselect\u6d3b\u7528\u8853<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8ca0\u8377\u306e\u6700\u9069\u5316\u624b\u6cd5<\/h3>\n\n\n\n<p>ActiveRecord\u3067select\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6700\u9069\u5316\u624b\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\uff1a<\/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 User &lt; ApplicationRecord\n  has_many :posts\n  has_many :comments\n\n  # 1. \u5fc5\u8981\u306a\u30ab\u30e9\u30e0\u306e\u307f\u3092\u9078\u629e\n  def self.active_users_summary\n    select(:id, :name, :email)\n      .where(active: true)\n  end\n\n  # 2. \u30ab\u30a6\u30f3\u30c8\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u30af\u30a8\u30ea\n  def self.popular_authors\n    select('users.*, COUNT(posts.id) as posts_count')\n      .joins(:posts)\n      .group('users.id')\n      .having('COUNT(posts.id) &gt; ?', 5)\n  end\n\n  # 3. \u6761\u4ef6\u306b\u5fdc\u3058\u305f\u52d5\u7684\u306aselect\n  def self.filtered_attributes(attributes = [])\n    select(attributes.presence || '*')\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">N+1\u554f\u984c\u3092\u56de\u907f\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>N+1\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306e\u52b9\u679c\u7684\u306a\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/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=\"\"># \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\ndef bad_example\n  users = User.all\n  users.each do |user|\n    puts user.posts.count  # N+1\u30af\u30a8\u30ea\u304c\u767a\u751f\n  end\nend\n\n# includes \u3092\u4f7f\u7528\u3057\u305f\u6700\u9069\u5316\ndef good_example\n  users = User.includes(:posts)\n  users.each do |user|\n    puts user.posts.size  # \u8ffd\u52a0\u306e\u30af\u30a8\u30ea\u304c\u767a\u751f\u3057\u306a\u3044\n  end\nend\n\n# joins \u3068 select \u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u6700\u9069\u5316\nclass Post &lt; ApplicationRecord\n  belongs_to :user\n\n  def self.with_user_details\n    select('posts.*, users.name as author_name')\n      .joins(:user)\n  end\nend\n\n# preload \u3068 select \u306e\u7d44\u307f\u5408\u308f\u305b\nclass User &lt; ApplicationRecord\n  def self.with_post_stats\n    preload(:posts)\n      .select('users.*, ' \\\n              '(SELECT COUNT(*) FROM posts WHERE posts.user_id = users.id) as posts_count')\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30b9\u30b3\u30fc\u30d7\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/h3>\n\n\n\n<p>select\u30e1\u30bd\u30c3\u30c9\u3068\u30b9\u30b3\u30fc\u30d7\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u30af\u30a8\u30ea\u306e\u66f8\u304d\u65b9\uff1a<\/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 Article &lt; ApplicationRecord\n  belongs_to :user\n  has_many :comments\n\n  # \u57fa\u672c\u7684\u306a\u30b9\u30b3\u30fc\u30d7\n  scope :published, -&gt; { where(published: true) }\n  scope :recent, -&gt; { where('created_at &gt; ?', 1.week.ago) }\n\n  # select\u3092\u542b\u3080\u30b9\u30b3\u30fc\u30d7\n  scope :with_basics, -&gt; { \n    select(:id, :title, :published_at) \n  }\n\n  # \u52d5\u7684\u306aselect\n  scope :with_custom_select, -&gt;(fields) { \n    select(fields) \n  }\n\n  # \u8907\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u4f8b\n  def self.recent_published_articles\n    published\n      .recent\n      .with_basics\n      .includes(:user)\n      .select('articles.*, users.name as author_name')\n      .joins(:user)\n  end\n\n  # \u96c6\u8a08\u3092\u542b\u3080\u30b9\u30b3\u30fc\u30d7\n  scope :with_comments_count, -&gt; {\n    select('articles.*, COUNT(comments.id) as comments_count')\n      .left_joins(:comments)\n      .group('articles.id')\n  }\nend\n\n# \u4f7f\u7528\u4f8b\ndef index\n  @articles = Article\n    .with_comments_count\n    .published\n    .recent\n    .limit(10)\nend<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30af\u30a8\u30ea\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u30ab\u30e9\u30e0\u306e\u307f\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u4e0d\u8981\u306aJOIN\u306e\u56de\u907f<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>N+1\u554f\u984c\u3078\u306e\u5bfe\u7b56<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>includes\/preload\/eager_load\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>\u30ab\u30a6\u30f3\u30c8\u30af\u30a8\u30ea\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u306e\u53d6\u5f97<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b9\u30b3\u30fc\u30d7\u306e\u8a2d\u8a08<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u5358\u4f4d\u3067\u30b9\u30b3\u30fc\u30d7\u3092\u5b9a\u7fa9<\/li>\n\n\n\n<li>\u67d4\u8edf\u306a\u7d44\u307f\u5408\u308f\u305b\u304c\u53ef\u80fd\u306a\u8a2d\u8a08<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u30b9\u30b3\u30fc\u30d7\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u5b9f\u52d9\u3067\u3088\u304f\u3042\u308b\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/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 UserFilter\n  def initialize(users)\n    @users = users\n  end\n\n  # \u8907\u6570\u6761\u4ef6\u3067\u306e\u7d5e\u308a\u8fbc\u307f\n  def filter(params)\n    result = @users\n\n    # \u5e74\u9f62\u306b\u3088\u308b\u7d5e\u308a\u8fbc\u307f\n    if params[:age_range]\n      min_age, max_age = params[:age_range].split('-').map(&amp;:to_i)\n      result = result.select { |user| user.age.between?(min_age, max_age) }\n    end\n\n    # \u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u3088\u308b\u7d5e\u308a\u8fbc\u307f\n    if params[:status]\n      result = result.select { |user| user.status == params[:status] }\n    end\n\n    # \u691c\u7d22\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3088\u308b\u7d5e\u308a\u8fbc\u307f\n    if params[:keyword]\n      keyword = params[:keyword].downcase\n      result = result.select do |user|\n        user.name.downcase.include?(keyword) ||\n        user.email.downcase.include?(keyword)\n      end\n    end\n\n    result\n  end\n\n  # \u6a29\u9650\u306b\u57fa\u3065\u304f\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n  def filter_by_permission(current_user)\n    case current_user.role\n    when 'admin'\n      @users  # \u5168\u30e6\u30fc\u30b6\u30fc\u3092\u8868\u793a\n    when 'manager'\n      @users.select { |user| user.department == current_user.department }\n    else\n      @users.select { |user| user.id == current_user.id }\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nfilter = UserFilter.new(User.all)\nfiltered_users = filter.filter(\n  age_range: '20-30',\n  status: 'active',\n  keyword: 'tech'\n)<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30d0\u30c3\u30c1\u51e6\u7406\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u306a\u30d0\u30c3\u30c1\u51e6\u7406\u3067\u306eselect\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\uff1a<\/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 DataProcessor\n  def self.process_large_dataset(batch_size: 1000)\n    processed_count = 0\n\n    # \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5\n    User.find_each(batch_size: batch_size) do |user|\n      user_data = user.data_entries.select do |entry|\n        entry.processed_at.nil? &amp;&amp; entry.valid_for_processing?\n      end\n\n      process_entries(user_data)\n      processed_count += user_data.size\n    end\n\n    processed_count\n  end\n\n  # CSV\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u51e6\u7406\n  def self.export_filtered_data(conditions)\n    require 'csv'\n\n    CSV.generate do |csv|\n      csv &lt;&lt; ['ID', 'Name', 'Email', 'Status']\n\n      User.find_each do |user|\n        next unless matches_conditions?(user, conditions)\n\n        csv &lt;&lt; [\n          user.id,\n          user.name,\n          user.email,\n          user.status\n        ]\n      end\n    end\n  end\n\n  private\n\n  def self.matches_conditions?(user, conditions)\n    conditions.all? do |key, value|\n      case key\n      when :status\n        user.status == value\n      when :age_range\n        min, max = value.split('-').map(&amp;:to_i)\n        user.age.between?(min, max)\n      when :department\n        user.department == value\n      else\n        true\n      end\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u30c7\u30fc\u30bf\u51e6\u7406\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>API\u958b\u767a\u3067\u3088\u304f\u4f7f\u7528\u3059\u308b\u30c7\u30fc\u30bf\u51e6\u7406\u30d1\u30bf\u30fc\u30f3\uff1a<\/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 ApiDataProcessor\n  # \u30ec\u30b9\u30dd\u30f3\u30b9\u30c7\u30fc\u30bf\u306e\u6574\u5f62\n  def self.format_user_response(users)\n    users.select { |user| user.active? }.map do |user|\n      {\n        id: user.id,\n        name: user.name,\n        email: user.email,\n        role: user.role,\n        last_login: user.last_login_at&amp;.iso8601\n      }\n    end\n  end\n\n  # \u30cd\u30b9\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u51e6\u7406\n  def self.process_nested_data(data)\n    data.select { |item| item[:status] == 'active' }\n      .map do |item|\n        children = item[:children].select { |child| child[:valid] }\n        item.merge(children: children)\n      end\n  end\n\n  # \u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u4ed8\u304d\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\n  def self.paginated_response(items, page: 1, per_page: 20)\n    start_index = (page - 1) * per_page\n    end_index = start_index + per_page\n\n    filtered_items = items.select { |item| item[:visible] }\n\n    {\n      items: filtered_items[start_index...end_index],\n      total: filtered_items.size,\n      page: page,\n      per_page: per_page,\n      total_pages: (filtered_items.size.to_f \/ per_page).ceil\n    }\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nclass Api::V1::UsersController &lt; ApplicationController\n  def index\n    users = User.includes(:profile, :preferences)\n\n    # \u30af\u30a8\u30ea\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u57fa\u3065\u304f\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n    if params[:role]\n      users = users.select { |u| u.role == params[:role] }\n    end\n\n    # \u30c7\u30fc\u30bf\u306e\u6574\u5f62\u3068\u8fd4\u5374\n    render json: ApiDataProcessor.format_user_response(users)\n  end\n\n  def search\n    users = User.search(params[:q])\n    paginated_data = ApiDataProcessor.paginated_response(\n      users,\n      page: params[:page].to_i,\n      per_page: params[:per_page].to_i\n    )\n\n    render json: paginated_data\n  end\nend<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u30ed\u30b8\u30c3\u30af\u306e\u6574\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30af\u30e9\u30b9\u3068\u3057\u3066\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u5bfe\u3059\u308b\u67d4\u8edf\u306a\u5bfe\u5fdc<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30d0\u30c3\u30c1\u30b5\u30a4\u30ba\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5236\u5fa1<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u8a2d\u8a08<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u306e\u9078\u629e<\/li>\n\n\n\n<li>\u4e00\u8cab\u6027\u306e\u3042\u308b\u30ec\u30b9\u30dd\u30f3\u30b9\u5f62\u5f0f<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3092\u53c2\u8003\u306b\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u305f\u5b9f\u88c5\u3092\u691c\u8a0e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">select\u30e1\u30bd\u30c3\u30c9\u306e\u30c6\u30b9\u30c8\u624b\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u5358\u4f53\u30c6\u30b9\u30c8\u306e\u66f8\u304d\u65b9\u3068\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<p>RSpec\u3092\u4f7f\u7528\u3057\u305fselect\u30e1\u30bd\u30c3\u30c9\u306e\u30c6\u30b9\u30c8\u5b9f\u88c5\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/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 'rspec'\n\nRSpec.describe 'SelectMethod' do\n  # \u57fa\u672c\u7684\u306a\u30c6\u30b9\u30c8\n  describe '\u57fa\u672c\u7684\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0' do\n    let(:numbers) { [1, 2, 3, 4, 5] }\n\n    it '\u5076\u6570\u306e\u307f\u3092\u62bd\u51fa\u3067\u304d\u308b\u3053\u3068' do\n      result = numbers.select(&amp;:even?)\n      expect(result).to eq([2, 4])\n    end\n\n    it '\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u304c\u306a\u3044\u5834\u5408\u306f\u7a7a\u914d\u5217\u3092\u8fd4\u3059\u3053\u3068' do\n      result = numbers.select { |n| n &gt; 10 }\n      expect(result).to be_empty\n    end\n  end\n\n  # \u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30c6\u30b9\u30c8\n  describe '\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0' do\n    let(:users) do\n      [\n        { name: 'Alice', age: 25, active: true },\n        { name: 'Bob', age: 30, active: false },\n        { name: 'Charlie', age: 35, active: true }\n      ]\n    end\n\n    it '\u8907\u6570\u6761\u4ef6\u3067\u306e\u7d5e\u308a\u8fbc\u307f\u304c\u3067\u304d\u308b\u3053\u3068' do\n      result = users.select { |user| user[:age] &gt;= 30 &amp;&amp; user[:active] }\n      expect(result).to contain_exactly(\n        { name: 'Charlie', age: 35, active: true }\n      )\n    end\n\n    it '\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u7d5e\u308a\u8fbc\u307f\u304c\u3067\u304d\u308b\u3053\u3068' do\n      nested_data = users.map { |u| { user: u, metadata: { created_at: Time.now } } }\n      result = nested_data.select { |d| d[:user][:active] }\n      expect(result.size).to eq(2)\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u30c6\u30b9\u30c8\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3084\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u306e\u30c6\u30b9\u30c8\u5b9f\u88c5\uff1a<\/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=\"\">RSpec.describe 'SelectMethodEdgeCases' do\n  describe '\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u51e6\u7406' do\n    it 'nil\u3092\u542b\u3080\u914d\u5217\u3092\u6b63\u3057\u304f\u51e6\u7406\u3067\u304d\u308b\u3053\u3068' do\n      array = [1, nil, 3, nil, 5]\n      result = array.select { |n| n.nil? }\n      expect(result).to eq([nil, nil])\n    end\n\n    it '\u7a7a\u306e\u914d\u5217\u306b\u5bfe\u3057\u3066\u6b63\u3057\u304f\u52d5\u4f5c\u3059\u308b\u3053\u3068' do\n      result = [].select { |n| n.even? }\n      expect(result).to be_empty\n    end\n\n    it '\u5927\u304d\u306a\u6570\u5024\u3092\u542b\u3080\u30b1\u30fc\u30b9\u3092\u51e6\u7406\u3067\u304d\u308b\u3053\u3068' do\n      large_numbers = [10**9, 10**10, 10**11]\n      result = large_numbers.select { |n| n &gt; 10**10 }\n      expect(result).to eq([10**11])\n    end\n  end\n\n  describe '\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u30c6\u30b9\u30c8' do\n    it 'select!\u3067\u914d\u5217\u304c\u5909\u66f4\u3055\u308c\u308b\u3053\u3068' do\n      array = [1, 2, 3, 4, 5]\n      array.select! { |n| n.even? }\n      expect(array).to eq([2, 4])\n    end\n\n    it '\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u304c\u306a\u3044\u5834\u5408\u306fnil\u3092\u8fd4\u3059\u3053\u3068' do\n      array = [1, 2, 3]\n      result = array.select! { |n| n &gt; 10 }\n      expect(result).to be_nil\n      expect(array).to eq([1, 2, 3])\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-23\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306e\u30c6\u30b9\u30c8\u5b9f\u88c5\uff1a<\/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 'benchmark'\n\nRSpec.describe 'SelectMethodPerformance' do\n  describe '\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u691c\u8a3c' do\n    let(:large_array) { (1..100000).to_a }\n\n    it '\u5b9f\u884c\u6642\u9593\u304c\u8a31\u5bb9\u7bc4\u56f2\u5185\u3067\u3042\u308b\u3053\u3068' do\n      execution_time = Benchmark.realtime do\n        large_array.select(&amp;:even?)\n      end\n      expect(execution_time).to be &lt; 0.1  # 100ms\u4ee5\u5185\n    end\n\n    it '\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u8a31\u5bb9\u7bc4\u56f2\u5185\u3067\u3042\u308b\u3053\u3068' do\n      memory_before = GetProcessMem.new.mb\n      result = large_array.select(&amp;:even?)\n      memory_after = GetProcessMem.new.mb\n\n      memory_increase = memory_after - memory_before\n      expect(memory_increase).to be &lt; 10  # 10MB\u4ee5\u5185\n    end\n  end\n\n  describe '\u6700\u9069\u5316\u624b\u6cd5\u306e\u691c\u8a3c' do\n    let(:data) { (1..10000).map { |i| { id: i, value: i * 2 } } }\n\n    it '\u30d0\u30c3\u30c1\u51e6\u7406\u304c\u52b9\u7387\u7684\u306b\u52d5\u4f5c\u3059\u308b\u3053\u3068' do\n      batch_size = 1000\n      processed = []\n\n      execution_time = Benchmark.realtime do\n        data.each_slice(batch_size) do |batch|\n          processed.concat(\n            batch.select { |item| item[:value] &gt; 15000 }\n          )\n        end\n      end\n\n      expect(execution_time).to be &lt; 0.2  # 200ms\u4ee5\u5185\n      expect(processed).not_to be_empty\n    end\n  end\nend<\/pre>\n\n\n\n<p>\u30c6\u30b9\u30c8\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u57fa\u672c\u7684\u306a\u30c6\u30b9\u30c8\u8a2d\u8a08<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u671f\u5f85\u3055\u308c\u308b\u52d5\u4f5c\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u8003\u616e<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u6e96\u5099<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u7db2\u7f85\u6027<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6b63\u5e38\u7cfb\u3068\u7570\u5e38\u7cfb\u306e\u4e21\u65b9\u3092\u30ab\u30d0\u30fc<\/li>\n\n\n\n<li>\u5883\u754c\u5024\u306e\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u306e\u8003\u616e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u884c\u6642\u9593\u306e\u8a08\u6e2c<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u3067\u306e\u52d5\u4f5c\u78ba\u8a8d<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30b9\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001select\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u4fe1\u983c\u6027\u3092\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":{"0":"post-1513","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ruby","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1513","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=1513"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1513\/revisions"}],"predecessor-version":[{"id":1514,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1513\/revisions\/1514"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}