{"id":2578,"date":"2025-03-24T08:47:00","date_gmt":"2025-03-23T23:47:00","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2578"},"modified":"2025-03-24T08:47:29","modified_gmt":"2025-03-23T23:47:29","slug":"laravel%e3%81%aeexists%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e5%ae%9f%e8%b7%b5%e7%9a%84%e3%81%aa7%e3%81%a4%e3%81%ae%e4%bd%bf%e7%94%a8%e4%be%8b%e3%81%a8%e3%83%91%e3%83%95%e3%82%a9","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2578","title":{"rendered":"Laravel\u306eExists\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u5b9f\u8df5\u7684\u306a7\u3064\u306e\u4f7f\u7528\u4f8b\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316"},"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\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u3068\u52d5\u4f5c\u539f\u7406<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">Exists\u30e1\u30bd\u30c3\u30c9\u304c\u5185\u90e8\u3067\u5b9f\u884c\u3059\u308bSQL\u30af\u30a8\u30ea\u306e\u4ed5\u7d44\u307f<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">whereExists\u3068Exists\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-5\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-6\">\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u5b58\u5728\u78ba\u8a8d\u306b\u3088\u308b\u6761\u4ef6\u5206\u5c90<\/a>      <\/li>      <li>        <a href=\"#i-7\">\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u8907\u96d1\u306a\u6761\u4ef6\u691c\u7d22\u306e\u5b9f\u88c5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-8\">\u8907\u6570\u30c6\u30fc\u30d6\u30eb\u3092\u8de8\u3044\u3060\u30c7\u30fc\u30bf\u306e\u5b58\u5728\u78ba\u8a8d<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-9\">Exists\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-10\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u306b\u3088\u308bExists\u51e6\u7406\u306e\u9ad8\u901f\u5316<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">N+1\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306eExists\u306e\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u6539\u5584\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">\u907f\u3051\u308b\u3079\u304d\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u4ee3\u66ff\u30a2\u30d7\u30ed\u30fc\u30c1<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u4e00\u822c\u7684\u306a\u30df\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-21\">\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5b9f\u88c5\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-22\">EC\u30b5\u30a4\u30c8\u3067\u306e\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u9069\u7528<\/a>      <\/li>      <li>        <a href=\"#i-23\">\u4f1a\u54e1\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6a29\u9650\u30c1\u30a7\u30c3\u30af\u306e\u5b9f\u88c5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-24\">\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306e\u5b9f\u88c5<\/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\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u3068\u52d5\u4f5c\u539f\u7406<\/h2>\n\n\n\n<p>Laravel\u306eExists\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306b\u304a\u3044\u3066\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u5b58\u5728\u78ba\u8a8d\u3092\u884c\u3046\u305f\u3081\u306e\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7406\u89e3\u3057\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">Exists\u30e1\u30bd\u30c3\u30c9\u304c\u5185\u90e8\u3067\u5b9f\u884c\u3059\u308bSQL\u30af\u30a8\u30ea\u306e\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p>Exists\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5185\u90e8\u7684\u306bSQL EXISTS\u53e5\u3092\u4f7f\u7528\u3057\u3066\u30af\u30a8\u30ea\u3092\u69cb\u7bc9\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\u3068\u3001\u305d\u308c\u304c\u5909\u63db\u3055\u308c\u308bSQL\u3092\u793a\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=\"\">\/\/ Laravel\u3067\u306e\u5b9f\u88c5\u4f8b\n$hasPublishedPosts = User::whereHas('posts', function($query) {\n    $query-&gt;where('status', 'published');\n})-&gt;exists();\n\n\/\/ \u751f\u6210\u3055\u308c\u308bSQL\nSELECT EXISTS (\n    SELECT * FROM users\n    WHERE EXISTS (\n        SELECT * FROM posts\n        WHERE posts.user_id = users.id\n        AND posts.status = 'published'\n    )\n) AS exists_result<\/pre>\n\n\n\n<p>\u3053\u306eSQL\u306e\u5b9f\u884c\u30d7\u30ed\u30bb\u30b9\u306f\u4ee5\u4e0b\u306e\u6d41\u308c\u3067\u884c\u308f\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u5b9f\u884c\uff1a\u5185\u90e8\u306eSELECT\u6587\u304c\u6700\u521d\u306b\u8a55\u4fa1\u3055\u308c\u307e\u3059<\/li>\n\n\n\n<li>\u5b58\u5728\u78ba\u8a8d\uff1aEXISTS\u53e5\u306b\u3088\u3063\u3066\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u304c1\u3064\u4ee5\u4e0a\u306e\u7d50\u679c\u3092\u8fd4\u3059\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d<\/li>\n\n\n\n<li>\u7d50\u679c\u306e\u8fd4\u5374\uff1a\u771f\u507d\u5024\uff08boolean\uff09\u3068\u3057\u3066\u7d50\u679c\u3092\u8fd4\u5374<\/li>\n<\/ol>\n\n\n\n<p>\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3068\u3057\u3066\u3001EXISTS\u53e5\u306f\u4ee5\u4e0b\u306e\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b8c\u5168\u306a\u7d50\u679c\u30bb\u30c3\u30c8\u3067\u306f\u306a\u304f\u3001\u30ec\u30b3\u30fc\u30c9\u306e\u5b58\u5728\u306e\u307f\u3092\u78ba\u8a8d<\/li>\n\n\n\n<li>\u6700\u521d\u306b\u30de\u30c3\u30c1\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u898b\u3064\u304b\u3063\u305f\u6642\u70b9\u3067\u8a55\u4fa1\u3092\u7d42\u4e86<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u6bd4\u8f03\u7684\u5c11\u306a\u3044<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">whereExists\u3068Exists\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p>Laravel\u3067\u306fExists\u95a2\u9023\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u3001<code>exists()<\/code>\u3068<code>whereExists()<\/code>\u306e2\u3064\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u9055\u3044\u3068\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">exists()\u30e1\u30bd\u30c3\u30c9<\/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=\"\">\/\/ exists()\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\n$hasActiveUsers = User::where('status', 'active')-&gt;exists();\n\n\/\/ \u4e0a\u8a18\u306f\u4ee5\u4e0b\u306eSQL\u306b\u5909\u63db\u3055\u308c\u308b\nSELECT EXISTS (\n    SELECT * FROM users WHERE status = 'active'\n) AS exists_result<\/pre>\n\n\n\n<p><code>exists()<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30af\u30a8\u30ea\u30d3\u30eb\u30c0\u30c1\u30a7\u30fc\u30f3\u306e\u7d42\u7aef\u3067\u4f7f\u7528<\/li>\n\n\n\n<li>\u5373\u5ea7\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u3092\u5b9f\u884c<\/li>\n\n\n\n<li>\u771f\u507d\u5024\u3092\u76f4\u63a5\u8fd4\u5374<\/li>\n\n\n\n<li>\u5358\u7d14\u306a\u5b58\u5728\u78ba\u8a8d\u306b\u6700\u9069<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">whereExists()\u30e1\u30bd\u30c3\u30c9<\/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=\"\">\/\/ whereExists()\u306e\u4f7f\u7528\u4f8b\n$users = User::whereExists(function($query) {\n    $query-&gt;select('*')\n          -&gt;from('orders')\n          -&gt;whereColumn('orders.user_id', 'users.id')\n          -&gt;where('total', '&gt;', 1000);\n})-&gt;get();\n\n\/\/ \u751f\u6210\u3055\u308c\u308bSQL\nSELECT * FROM users\nWHERE EXISTS (\n    SELECT * FROM orders\n    WHERE orders.user_id = users.id\n    AND total &gt; 1000\n)<\/pre>\n\n\n\n<p><code>whereExists()<\/code>\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30af\u30a8\u30ea\u30d3\u30eb\u30c0\u30c1\u30a7\u30fc\u30f3\u306e\u9014\u4e2d\u3067\u4f7f\u7528\u53ef\u80fd<\/li>\n\n\n\n<li>\u4ed6\u306e\u6761\u4ef6\u3068\u7d44\u307f\u5408\u308f\u305b\u53ef\u80fd<\/li>\n\n\n\n<li>\u30af\u30a8\u30ea\u306e\u4e00\u90e8\u3068\u3057\u3066\u6a5f\u80fd<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u6761\u4ef6\u5206\u5c90\u306b\u9069\u3057\u3066\u3044\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u4f7f\u3044\u5206\u3051\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5358\u7d14\u306a\u5b58\u5728\u78ba\u8a8d\u306e\u5834\u5408<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>exists()<\/code>\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u4f8b\uff1a\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u304b\u306e\u78ba\u8a8d<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8907\u96d1\u306a\u30af\u30a8\u30ea\u306e\u4e00\u90e8\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u5834\u5408<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>whereExists()<\/code>\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u4f8b\uff1a\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u30ec\u30b3\u30fc\u30c9\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u91cd\u8996\u3059\u308b\u5834\u5408<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u80fd\u306a\u9650\u308a<code>exists()<\/code>\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u53d6\u5f97\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001Laravel\u306eExists\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u305d\u306e\u5185\u90e8\u52d5\u4f5c\u3092\u7406\u89e3\u3057\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u5b9f\u88c5\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-5\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/h2>\n\n\n\n<p>Exists\u30e1\u30bd\u30c3\u30c9\u306e\u771f\u4fa1\u306f\u3001\u5b9f\u969b\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306b\u304a\u3051\u308b\u5177\u4f53\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3067\u767a\u63ee\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u901a\u3058\u3066\u3001Exists\u30e1\u30bd\u30c3\u30c9\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u5b58\u5728\u78ba\u8a8d\u306b\u3088\u308b\u6761\u4ef6\u5206\u5c90<\/h3>\n\n\n\n<p>\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u30c7\u30fc\u30bf\u5b58\u5728\u78ba\u8a8d\u306f\u3001Exists\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u3082\u4e00\u822c\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\u306e1\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u793a\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=\"\">\/\/ \u5546\u54c1\u30e2\u30c7\u30eb\u306e\u5b9a\u7fa9\nclass Product extends Model\n{\n    public function reviews()\n    {\n        return $this-&gt;hasMany(Review::class);\n    }\n\n    public function scopeHasPositiveReviews($query)\n    {\n        return $query-&gt;whereHas('reviews', function($query) {\n            $query-&gt;where('rating', '&gt;=', 4);\n        });\n    }\n}\n\n\/\/ \u5b9f\u88c5\u4f8b1: \u30ec\u30d3\u30e5\u30fc\u4ed8\u304d\u5546\u54c1\u306e\u53d6\u5f97\n$productsWithReviews = Product::whereHas('reviews')-&gt;get();\n\n\/\/ \u5b9f\u88c5\u4f8b2: \u9ad8\u8a55\u4fa1\u30ec\u30d3\u30e5\u30fc\u306e\u3042\u308b\u5546\u54c1\u306e\u307f\u3092\u53d6\u5f97\n$topRatedProducts = Product::hasPositiveReviews()-&gt;get();\n\n\/\/ \u5b9f\u88c5\u4f8b3: \u30ec\u30d3\u30e5\u30fc\u304c\u7121\u3044\u5546\u54c1\u306e\u53d6\u5f97\uff08\u5426\u5b9a\u306e\u4f7f\u7528\u4f8b\uff09\n$productsWithoutReviews = Product::whereDoesntHave('reviews')-&gt;get();<\/pre>\n\n\n\n<p>\u3053\u306e\u5b9f\u88c5\u306e\u5229\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30af\u30a8\u30ea\u306e\u53ef\u8aad\u6027\u304c\u9ad8\u3044<\/li>\n\n\n\n<li>\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u30e2\u30c7\u30eb\u306b\u30ab\u30d7\u30bb\u30eb\u5316<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30b9\u30b3\u30fc\u30d7\u3068\u3057\u3066\u5b9a\u7fa9\u53ef\u80fd<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u8907\u96d1\u306a\u6761\u4ef6\u691c\u7d22\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u3088\u308a\u8907\u96d1\u306a\u691c\u7d22\u6761\u4ef6\u3092\u5b9f\u88c5\u3059\u308b\u5834\u5408\u3001Exists\u30e1\u30bd\u30c3\u30c9\u3068\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u67d4\u8edf\u306a\u691c\u7d22\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=\"\">\/\/ \u76f4\u8fd130\u65e5\u4ee5\u5185\u306b\u6ce8\u6587\u304c\u3042\u308b\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u9867\u5ba2\u3092\u691c\u7d22\n$activeCustomers = Customer::whereExists(function($query) {\n    $query-&gt;select('*')\n          -&gt;from('orders')\n          -&gt;whereColumn('orders.customer_id', 'customers.id')\n          -&gt;where('created_at', '&gt;=', now()-&gt;subDays(30));\n})-&gt;where('status', 'active')\n  -&gt;get();\n\n\/\/ \u7279\u5b9a\u306e\u30ab\u30c6\u30b4\u30ea\u30fc\u306e\u5546\u54c1\u3092\u8cfc\u5165\u3057\u305f\u3053\u3068\u304c\u3042\u308b\u9867\u5ba2\u3092\u691c\u7d22\n$customers = Customer::whereExists(function($query) use ($categoryId) {\n    $query-&gt;select('*')\n          -&gt;from('orders')\n          -&gt;join('order_items', 'orders.id', '=', 'order_items.order_id')\n          -&gt;join('products', 'order_items.product_id', '=', 'products.id')\n          -&gt;whereColumn('orders.customer_id', 'customers.id')\n          -&gt;where('products.category_id', $categoryId);\n})-&gt;get();<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b5\u30d6\u30af\u30a8\u30ea\u5185\u3067join\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>whereColumn\u3092\u4f7f\u7528\u3057\u3066\u9069\u5207\u306a\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u95a2\u9023\u4ed8\u3051\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u30af\u30a8\u30ea\u306f\u3001\u5c02\u7528\u306e\u30b9\u30b3\u30fc\u30d7\u3068\u3057\u3066\u5207\u308a\u51fa\u3059\u3053\u3068\u3092\u63a8\u5968<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u8907\u6570\u30c6\u30fc\u30d6\u30eb\u3092\u8de8\u3044\u3060\u30c7\u30fc\u30bf\u306e\u5b58\u5728\u78ba\u8a8d<\/h3>\n\n\n\n<p>\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u8de8\u3044\u3060\u5b58\u5728\u78ba\u8a8d\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u3068\u3057\u3066\u983b\u7e41\u306b\u767a\u751f\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u8cfc\u5165\u5c65\u6b74\u306e\u3042\u308b\u5546\u54c1\u3067\u3001\u304b\u3064\u5728\u5eab\u5207\u308c\u306e\u5546\u54c1\u3092\u691c\u7d22\n$products = Product::whereExists(function($query) {\n    $query-&gt;select('*')\n          -&gt;from('order_items')\n          -&gt;whereColumn('order_items.product_id', 'products.id');\n})-&gt;whereDoesntExist(function($query) {\n    $query-&gt;select('*')\n          -&gt;from('inventory')\n          -&gt;whereColumn('inventory.product_id', 'products.id')\n          -&gt;where('quantity', '&gt;', 0);\n})-&gt;get();\n\n\/\/ \u7279\u5b9a\u306e\u671f\u9593\u306b\u8907\u6570\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u6ce8\u6587\u3092\u691c\u7d22\nclass Order extends Model\n{\n    public function scopeHasVerifiedPayment($query)\n    {\n        return $query-&gt;whereExists(function($query) {\n            $query-&gt;select('*')\n                  -&gt;from('payments')\n                  -&gt;whereColumn('payments.order_id', 'orders.id')\n                  -&gt;where('status', 'verified');\n        });\n    }\n\n    public function scopeHasShipment($query)\n    {\n        return $query-&gt;whereExists(function($query) {\n            $query-&gt;select('*')\n                  -&gt;from('shipments')\n                  -&gt;whereColumn('shipments.order_id', 'orders.id');\n        });\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$completedOrders = Order::hasVerifiedPayment()\n    -&gt;hasShipment()\n    -&gt;whereBetween('created_at', [$startDate, $endDate])\n    -&gt;get();<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u6570\u306eExists\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u5834\u5408\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528\u304c\u91cd\u8981<\/li>\n\n\n\n<li>\u30b9\u30b3\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u30af\u30a8\u30ea\u306e\u518d\u5229\u7528\u6027\u3092\u9ad8\u3081\u308b<\/li>\n\n\n\n<li>\u53ef\u8aad\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u3001\u8907\u96d1\u306a\u30af\u30a8\u30ea\u306f\u9069\u5207\u306b\u5206\u5272\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001Exists\u30e1\u30bd\u30c3\u30c9\u306f\u69d8\u3005\u306a\u5b9f\u8df5\u7684\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u5b9f\u88c5\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u884c\u3046\u305f\u3081\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-9\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<p>Exists\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u969b\u306e\u30d7\u30ed\u30c0\u30af\u30b7\u30e7\u30f3\u74b0\u5883\u3067\u52b9\u7387\u7684\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u9069\u5207\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001Exists\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u305f\u3081\u306e\u5177\u4f53\u7684\u306a\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u306b\u3088\u308bExists\u51e6\u7406\u306e\u9ad8\u901f\u5316<\/h3>\n\n\n\n<p>Exists\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u3001\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u52b9\u679c\u7684\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u306e\u4f8b\u3092\u793a\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=\"\">\/\/ \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u5b9a\nclass CreateOrdersTable extends Migration\n{\n    public function up()\n    {\n        Schema::create('orders', function (Blueprint $table) {\n            $table-&gt;id();\n            $table-&gt;unsignedBigInteger('user_id');\n            $table-&gt;string('status');\n            $table-&gt;timestamps();\n\n            \/\/ \u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f5c\u6210\n            $table-&gt;index(['user_id', 'status']);\n            \/\/ \u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u691c\u7d22\u6761\u4ef6\u7528\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\n            $table-&gt;index(['status', 'created_at']);\n        });\n    }\n}\n\n\/\/ \u52b9\u7387\u7684\u306a\u30af\u30a8\u30ea\u306e\u4f8b\n$activeOrders = Order::whereExists(function($query) use ($userId) {\n    $query-&gt;select('id')  \/\/ \u5fc5\u8981\u306a\u5217\u306e\u307f\u3092\u9078\u629e\n          -&gt;from('orders')\n          -&gt;whereColumn('orders.user_id', 'users.id')\n          -&gt;where('status', 'active')\n          \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3057\u305f\u7bc4\u56f2\u6307\u5b9a\n          -&gt;whereBetween('created_at', [\n              now()-&gt;subDays(30),\n              now()\n          ]);\n})-&gt;get();<\/pre>\n\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u691c\u7d22\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u57fa\u3065\u304f\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f5c\u6210<\/li>\n\n\n\n<li>\u30af\u30a8\u30ea\u30d7\u30e9\u30f3\u306e\u5b9a\u671f\u7684\u306a\u78ba\u8a8d\u3068\u5206\u6790<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664\u306b\u3088\u308b\u66f4\u65b0\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u7dad\u6301<\/li>\n<\/ol>\n\n\n\n<p>\u5b9f\u884c\u30d7\u30e9\u30f3\u306e\u5206\u6790\u4f8b\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=\"\">-- \u30af\u30a8\u30ea\u30d7\u30e9\u30f3\u306e\u78ba\u8a8d\nEXPLAIN SELECT EXISTS (\n    SELECT id FROM orders \n    WHERE user_id = 1 AND status = 'active'\n    AND created_at &gt;= '2024-01-01'\n) AS exists_result;<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">N+1\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306eExists\u306e\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>Exists\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u3001\u7279\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u306e\u304cN+1\u554f\u984c\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001N+1\u554f\u984c\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306e\u5b9f\u88c5\u4f8b\u3092\u793a\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=\"\">\/\/ \u60aa\u3044\u4f8b\uff1aN+1\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\n$users = User::all();\nforeach ($users as $user) {\n    if ($user-&gt;orders()-&gt;exists()) {\n        \/\/ \u5404\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u3066\u500b\u5225\u306eexists\u30af\u30a8\u30ea\u304c\u5b9f\u884c\u3055\u308c\u308b\n    }\n}\n\n\/\/ \u826f\u3044\u4f8b\uff1a\u4e00\u62ec\u3067exists\u5224\u5b9a\u3092\u884c\u3046\n$usersWithOrders = User::whereExists(function($query) {\n    $query-&gt;select('id')\n          -&gt;from('orders')\n          -&gt;whereColumn('orders.user_id', 'users.id');\n})-&gt;get();\n\n\/\/ \u3088\u308a\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u6700\u9069\u5316\u4f8b\nclass User extends Model\n{\n    public function scopeWithOrderStatus($query, $status)\n    {\n        return $query-&gt;addSelect([\n            'has_active_orders' =&gt; Order::select('id')\n                -&gt;whereColumn('user_id', 'users.id')\n                -&gt;where('status', $status)\n                -&gt;limit(1)\n        ]);\n    }\n}\n\n\/\/ \u6700\u9069\u5316\u3055\u308c\u305f\u30af\u30a8\u30ea\u306e\u4f7f\u7528\u4f8b\n$users = User::withOrderStatus('active')-&gt;get();<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u5217\u306e\u307f\u3092\u9078\u629e\uff08<code>select('id')<\/code>\u306e\u4f7f\u7528\uff09<\/li>\n\n\n\n<li>limit(1)\u306b\u3088\u308b\u65e9\u671f\u7d42\u4e86<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5<\/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=\"\">\/\/ \u5927\u91cf\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u306e\u30c1\u30e3\u30f3\u30af\u51e6\u7406\nUser::chunk(1000, function($users) {\n    $userIds = $users-&gt;pluck('id');\n\n    \/\/ \u4e00\u62ec\u3067exists\u5224\u5b9a\n    $usersWithOrders = User::whereIn('id', $userIds)\n        -&gt;whereExists(function($query) {\n            $query-&gt;select('id')\n                  -&gt;from('orders')\n                  -&gt;whereColumn('orders.user_id', 'users.id');\n        })-&gt;get();\n});<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u5b58\u5728\u78ba\u8a8d\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\n$hasActiveOrders = Cache::remember(\n    'user.'.$userId.'.has_active_orders',\n    now()-&gt;addMinutes(30),\n    function() use ($userId) {\n        return Order::where('user_id', $userId)\n                   -&gt;where('status', 'active')\n                   -&gt;exists();\n    }\n);<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30af\u30a8\u30ea\u30ed\u30b0\u306e\u76e3\u8996<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30c7\u30d0\u30c3\u30b0\u30e2\u30fc\u30c9\u3067\u306e\u30af\u30a8\u30ea\u30ed\u30b0\u53d6\u5f97\n\\DB::enableQueryLog();\n\/\/ \u30af\u30a8\u30ea\u5b9f\u884c\n$result = User::whereExists(...)-&gt;get();\n\/\/ \u30ed\u30b0\u306e\u78ba\u8a8d\ndd(\\DB::getQueryLog());<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u5b9f\u884c\u6642\u9593\u306e\u8a08\u6e2c<\/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=\"\">$startTime = microtime(true);\n\/\/ \u30af\u30a8\u30ea\u5b9f\u884c\n$result = User::whereExists(...)-&gt;get();\n$executionTime = microtime(true) - $startTime;\nLog::info(\"Query execution time: {$executionTime} seconds\");<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001Exists\u30e1\u30bd\u30c3\u30c9\u3092\u52b9\u7387\u7684\u306b\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u88c5\u6642\u306b\u907f\u3051\u308b\u3079\u304d\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">Exists\u30e1\u30bd\u30c3\u30c9\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u6539\u5584\u65b9\u6cd5<\/h2>\n\n\n\n<p>Exists\u30e1\u30bd\u30c3\u30c9\u306f\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u304c\u3001\u9069\u5207\u306b\u4f7f\u7528\u3057\u306a\u3044\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u3084\u4fdd\u5b88\u6027\u306e\u60aa\u5316\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u304f\u898b\u3089\u308c\u308b\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u305d\u306e\u6539\u5584\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u907f\u3051\u308b\u3079\u304d\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u4ee3\u66ff\u30a2\u30d7\u30ed\u30fc\u30c1<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-14\">1. \u4e0d\u5fc5\u8981\u306a\u30ab\u30e9\u30e0\u53d6\u5f97<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u4e0d\u5fc5\u8981\u306a\u30ab\u30e9\u30e0\u3092\u5168\u3066\u53d6\u5f97\n$hasOrders = Order::whereExists(function($query) use ($userId) {\n    $query-&gt;select('*')  \/\/ \u5168\u30ab\u30e9\u30e0\u3092\u9078\u629e\n          -&gt;from('orders')\n          -&gt;where('user_id', $userId);\n})-&gt;exists();\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u5fc5\u8981\u306a\u30ab\u30e9\u30e0\u306e\u307f\u3092\u6307\u5b9a\n$hasOrders = Order::whereExists(function($query) use ($userId) {\n    $query-&gt;select('id')  \/\/ \u4e3b\u30ad\u30fc\u306e\u307f\u3092\u9078\u629e\n          -&gt;from('orders')\n          -&gt;where('user_id', $userId);\n})-&gt;exists();<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\">2. \u975e\u52b9\u7387\u306a\u30eb\u30fc\u30d7\u5185\u3067\u306eExists\u4f7f\u7528<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u30eb\u30fc\u30d7\u5185\u3067\u306e\u500b\u5225\u30af\u30a8\u30ea\nforeach ($users as $user) {\n    $hasActiveSubscription = Subscription::where('user_id', $user-&gt;id)\n        -&gt;where('status', 'active')\n        -&gt;exists();\n    \/\/ \u51e6\u7406...\n}\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u4e00\u62ec\u51e6\u7406\n$usersWithSubscription = User::addSelect([\n    'has_active_subscription' =&gt; Subscription::select(1)\n        -&gt;whereColumn('user_id', 'users.id')\n        -&gt;where('status', 'active')\n        -&gt;limit(1)\n])-&gt;get();<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-16\">3. \u4e0d\u9069\u5207\u306a\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9a\u7fa9<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u5b58\u5728\u78ba\u8a8d\u306e\u305f\u3073\u306b\u30af\u30a8\u30ea\u3092\u5b9f\u884c\nclass User extends Model\n{\n    public function hasActiveOrders()\n    {\n        return $this-&gt;orders()-&gt;where('status', 'active')-&gt;exists();\n    }\n}\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u30a2\u30af\u30bb\u30b5\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528\nclass User extends Model\n{\n    protected $appends = ['has_active_orders'];\n\n    public function getHasActiveOrdersAttribute()\n    {\n        return Cache::remember(\n            \"user.{$this-&gt;id}.has_active_orders\",\n            now()-&gt;addMinutes(30),\n            fn() =&gt; $this-&gt;orders()-&gt;where('status', 'active')-&gt;exists()\n        );\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-17\">4. \u8907\u96d1\u3059\u304e\u308bExists\u30af\u30a8\u30ea<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a1\u3064\u306eExists\u30af\u30a8\u30ea\u306b\u8907\u96d1\u306a\u6761\u4ef6\u3092\u8a70\u3081\u8fbc\u3080\n$users = User::whereExists(function($query) {\n    $query-&gt;select('*')\n          -&gt;from('orders')\n          -&gt;join('products', 'orders.product_id', '=', 'products.id')\n          -&gt;join('categories', 'products.category_id', '=', 'categories.id')\n          -&gt;whereColumn('orders.user_id', 'users.id')\n          -&gt;where('categories.type', 'premium')\n          -&gt;where('orders.status', 'completed');\n})-&gt;get();\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u30b9\u30b3\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u8907\u96d1\u3055\u3092\u5206\u5272\nclass User extends Model\n{\n    public function scopeHasCompletedPremiumOrders($query)\n    {\n        return $query-&gt;whereExists(function($subquery) {\n            $subquery-&gt;select('id')\n                    -&gt;from('orders')\n                    -&gt;whereColumn('user_id', 'users.id')\n                    -&gt;where('status', 'completed')\n                    -&gt;whereExists(function($productQuery) {\n                        $productQuery-&gt;select('id')\n                                   -&gt;from('products')\n                                   -&gt;whereColumn('id', 'orders.product_id')\n                                   -&gt;whereExists(function($categoryQuery) {\n                                       $categoryQuery-&gt;select('id')\n                                                   -&gt;from('categories')\n                                                   -&gt;whereColumn('id', 'products.category_id')\n                                                   -&gt;where('type', 'premium');\n                                   });\n                    });\n        });\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u4e00\u822c\u7684\u306a\u30df\u30b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-19\">1. \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4e0d\u9069\u5207\u306a\u4f7f\u7528<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u304b\u306a\u3044WHERE\u53e5\u306e\u9806\u5e8f\nclass CreateProductsTable extends Migration\n{\n    public function up()\n    {\n        Schema::create('products', function (Blueprint $table) {\n            $table-&gt;id();\n            $table-&gt;string('status');\n            $table-&gt;decimal('price');\n            \/\/ \u500b\u5225\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\n            $table-&gt;index('status');\n            $table-&gt;index('price');\n        });\n    }\n}\n\n\/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u304b\u306a\u3044\u30af\u30a8\u30ea\n$products = Product::whereExists(function($query) {\n    $query-&gt;select('id')\n          -&gt;from('products')\n          -&gt;where('price', '&gt;', 1000)  \/\/ \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u304c\u9ad8\u3044\u6761\u4ef6\u3092\u5148\u306b\n          -&gt;where('status', 'active'); \/\/ \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u304c\u4f4e\u3044\u6761\u4ef6\u3092\u5f8c\u306b\n})-&gt;get();\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u9069\u5207\u306a\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u6761\u4ef6\u306e\u9806\u5e8f\nclass CreateProductsTable extends Migration\n{\n    public function up()\n    {\n        Schema::create('products', function (Blueprint $table) {\n            $table-&gt;id();\n            $table-&gt;string('status');\n            $table-&gt;decimal('price');\n            \/\/ \u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306e\u4f4e\u3044\u5217\u3092\u5148\u306b\uff09\n            $table-&gt;index(['status', 'price']);\n        });\n    }\n}\n\n\/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u30af\u30a8\u30ea\n$products = Product::whereExists(function($query) {\n    $query-&gt;select('id')\n          -&gt;from('products')\n          -&gt;where('status', 'active')  \/\/ \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u304c\u4f4e\u3044\u6761\u4ef6\u3092\u5148\u306b\n          -&gt;where('price', '&gt;', 1000); \/\/ \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u304c\u9ad8\u3044\u6761\u4ef6\u3092\u5f8c\u306b\n})-&gt;get();<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-20\">2. \u4e0d\u9069\u5207\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u983b\u7e41\u306b\u5909\u66f4\u3055\u308c\u308b\u30c7\u30fc\u30bf\u306e\u4e0d\u9069\u5207\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\n$hasRecentOrders = Cache::remember(\n    \"user.{$userId}.has_recent_orders\",\n    now()-&gt;addHours(24),  \/\/ \u9577\u3059\u304e\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u671f\u9593\n    fn() =&gt; Order::where('user_id', $userId)\n                 -&gt;where('created_at', '&gt;=', now()-&gt;subMinutes(30))\n                 -&gt;exists()\n);\n\n\/\/ \u6539\u5584\u4f8b\uff1a\u30c7\u30fc\u30bf\u306e\u7279\u6027\u306b\u5408\u308f\u305b\u305f\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\n$hasRecentOrders = Cache::remember(\n    \"user.{$userId}.has_recent_orders\",\n    now()-&gt;addMinutes(5),  \/\/ \u3088\u308a\u9069\u5207\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u671f\u9593\n    fn() =&gt; Order::where('user_id', $userId)\n                 -&gt;where('created_at', '&gt;=', now()-&gt;subMinutes(30))\n                 -&gt;exists()\n);\n\n\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u81ea\u52d5\u66f4\u65b0\u30c8\u30ea\u30ac\u30fc\u306e\u5b9f\u88c5\nclass Order extends Model\n{\n    protected static function booted()\n    {\n        static::created(function ($order) {\n            Cache::forget(\"user.{$order-&gt;user_id}.has_recent_orders\");\n        });\n    }\n}<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306a\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3092\u907f\u3051\u3001\u9069\u5207\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u63a1\u7528\u3059\u308b\u3053\u3068\u3067\u3001Exists\u30e1\u30bd\u30c3\u30c9\u306e\u52b9\u7387\u7684\u306a\u6d3b\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u307e\u3067\u306e\u77e5\u8b58\u3092\u6d3b\u304b\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5b9f\u88c5\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-21\">\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<p>\u3053\u308c\u307e\u3067\u306b\u5b66\u3093\u3060Exists\u30e1\u30bd\u30c3\u30c9\u306e\u77e5\u8b58\u3092\u3001\u5b9f\u969b\u306e\u30d3\u30b8\u30cd\u30b9\u30b7\u30fc\u30f3\u3067\u6d3b\u7528\u3059\u308b\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u4fdd\u5b88\u6027\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u65b9\u6cd5\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">EC\u30b5\u30a4\u30c8\u3067\u306e\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3078\u306e\u9069\u7528<\/h3>\n\n\n\n<p>EC\u30b5\u30a4\u30c8\u306b\u304a\u3051\u308b\u5728\u5eab\u7ba1\u7406\u3067\u306f\u3001\u5546\u54c1\u306e\u53ef\u7528\u6027\u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u628a\u63e1\u3057\u3001\u9069\u5207\u306a\u5728\u5eab\u72b6\u614b\u306e\u7ba1\u7406\u3068\u8868\u793a\u304c\u6c42\u3081\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=\"\">\/\/ \u5728\u5eab\u7ba1\u7406\u7528\u306e\u30e2\u30c7\u30eb\u5b9a\u7fa9\nclass Product extends Model\n{\n    \/\/ \u5728\u5eab\u60c5\u5831\u3068\u306e\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\n    public function inventory()\n    {\n        return $this-&gt;hasOne(Inventory::class);\n    }\n\n    \/\/ \u6ce8\u6587\u60c5\u5831\u3068\u306e\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\n    public function orderItems()\n    {\n        return $this-&gt;hasMany(OrderItem::class);\n    }\n\n    \/\/ \u5728\u5eab\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u306e\u30b9\u30b3\u30fc\u30d7\n    public function scopeAvailable($query)\n    {\n        return $query-&gt;whereExists(function($query) {\n            $query-&gt;select('id')\n                  -&gt;from('inventories')\n                  -&gt;whereColumn('product_id', 'products.id')\n                  -&gt;where('quantity', '&gt;', 0)\n                  -&gt;where('status', 'active');\n        });\n    }\n\n    \/\/ \u6700\u8fd1\u58f2\u308c\u305f\u5546\u54c1\u306e\u30b9\u30b3\u30fc\u30d7\n    public function scopeRecentlySold($query, $days = 7)\n    {\n        return $query-&gt;whereExists(function($query) use ($days) {\n            $query-&gt;select('id')\n                  -&gt;from('order_items')\n                  -&gt;join('orders', 'orders.id', '=', 'order_items.order_id')\n                  -&gt;whereColumn('product_id', 'products.id')\n                  -&gt;where('orders.created_at', '&gt;=', now()-&gt;subDays($days))\n                  -&gt;where('orders.status', 'completed');\n        });\n    }\n}\n\n\/\/ \u5728\u5eab\u7ba1\u7406\u30b5\u30fc\u30d3\u30b9\u306e\u5b9f\u88c5\nclass InventoryService\n{\n    public function updateStockStatus()\n    {\n        \/\/ \u5728\u5eab\u5207\u308c\u5546\u54c1\u306e\u66f4\u65b0\n        Product::whereDoesntExist(function($query) {\n            $query-&gt;select('id')\n                  -&gt;from('inventories')\n                  -&gt;whereColumn('product_id', 'products.id')\n                  -&gt;where('quantity', '&gt;', 0);\n        })-&gt;update([\n            'stock_status' =&gt; 'out_of_stock',\n            'available_for_sale' =&gt; false\n        ]);\n\n        \/\/ \u5728\u5eab\u50c5\u5c11\u5546\u54c1\u306e\u30a2\u30e9\u30fc\u30c8\n        $lowStockProducts = Product::whereExists(function($query) {\n            $query-&gt;select('id')\n                  -&gt;from('inventories')\n                  -&gt;whereColumn('product_id', 'products.id')\n                  -&gt;where('quantity', '&lt;=', 5)\n                  -&gt;where('quantity', '&gt;', 0);\n        })-&gt;get();\n\n        event(new LowStockAlert($lowStockProducts));\n    }\n\n    \/\/ \u5728\u5eab\u5f15\u304d\u5f53\u3066\u306e\u691c\u8a3c\n    public function validateStockAllocation(array $items)\n    {\n        return Product::whereIn('id', array_column($items, 'product_id'))\n            -&gt;whereExists(function($query) use ($items) {\n                $query-&gt;select('id')\n                      -&gt;from('inventories')\n                      -&gt;whereColumn('product_id', 'products.id')\n                      -&gt;whereRaw('quantity &gt;= ?', [array_sum(array_column($items, 'quantity'))]);\n            })-&gt;count() === count($items);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-23\">\u4f1a\u54e1\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6a29\u9650\u30c1\u30a7\u30c3\u30af\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u4f1a\u54e1\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u6a29\u9650\u3084\u72b6\u614b\u306b\u57fa\u3065\u3044\u3066\u6a5f\u80fd\u3078\u306e\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Exists\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u6a29\u9650\u30c1\u30a7\u30c3\u30af\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class User extends Model\n{\n    \/\/ \u6a29\u9650\u30c1\u30a7\u30c3\u30af\u7528\u306e\u30b9\u30b3\u30fc\u30d7\n    public function scopeWithPermission($query, $permissionSlug)\n    {\n        return $query-&gt;whereExists(function($query) use ($permissionSlug) {\n            $query-&gt;select('id')\n                  -&gt;from('role_user')\n                  -&gt;join('role_permission', 'role_user.role_id', '=', 'role_permission.role_id')\n                  -&gt;join('permissions', 'role_permission.permission_id', '=', 'permissions.id')\n                  -&gt;whereColumn('role_user.user_id', 'users.id')\n                  -&gt;where('permissions.slug', $permissionSlug);\n        });\n    }\n\n    \/\/ \u30a2\u30af\u30c6\u30a3\u30d6\u306a\u4f1a\u54e1\u306e\u30b9\u30b3\u30fc\u30d7\n    public function scopeActiveSubscription($query)\n    {\n        return $query-&gt;whereExists(function($query) {\n            $query-&gt;select('id')\n                  -&gt;from('subscriptions')\n                  -&gt;whereColumn('user_id', 'users.id')\n                  -&gt;where('status', 'active')\n                  -&gt;where('expires_at', '&gt;', now());\n        });\n    }\n}\n\n\/\/ \u6a29\u9650\u30c1\u30a7\u30c3\u30af\u30b5\u30fc\u30d3\u30b9\u306e\u5b9f\u88c5\nclass PermissionService\n{\n    public function checkAccess(User $user, string $permission): bool\n    {\n        return Cache::remember(\n            \"user.{$user-&gt;id}.permission.{$permission}\",\n            now()-&gt;addMinutes(30),\n            function() use ($user, $permission) {\n                return User::where('id', $user-&gt;id)\n                          -&gt;withPermission($permission)\n                          -&gt;exists();\n            }\n        );\n    }\n\n    \/\/ \u8907\u6570\u306e\u6a29\u9650\u3092\u4e00\u62ec\u30c1\u30a7\u30c3\u30af\n    public function checkMultiplePermissions(User $user, array $permissions): array\n    {\n        $results = [];\n        foreach ($permissions as $permission) {\n            $results[$permission] = $this-&gt;checkAccess($user, $permission);\n        }\n        return $results;\n    }\n}\n\n\/\/ \u6a29\u9650\u30c1\u30a7\u30c3\u30af\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\nclass PermissionMiddleware\n{\n    public function handle($request, Closure $next, $permission)\n    {\n        if (!app(PermissionService::class)-&gt;checkAccess($request-&gt;user(), $permission)) {\n            throw new AccessDeniedHttpException('\u6a29\u9650\u304c\u3042\u308a\u307e\u305b\u3093');\n        }\n        return $next($request);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u4e88\u7d04\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u540c\u4e00\u6642\u9593\u67a0\u3067\u306e\u91cd\u8907\u4e88\u7d04\u3092\u9632\u3050\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Exists\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u304c\u53ef\u80fd\u306b\u306a\u308a\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 Reservation extends Model\n{\n    protected $casts = [\n        'start_datetime' =&gt; 'datetime',\n        'end_datetime' =&gt; 'datetime',\n    ];\n\n    \/\/ \u91cd\u8907\u4e88\u7d04\u30c1\u30a7\u30c3\u30af\u7528\u306e\u30b9\u30b3\u30fc\u30d7\n    public function scopeOverlapping($query, $start, $end, $resourceId)\n    {\n        return $query-&gt;whereExists(function($query) use ($start, $end, $resourceId) {\n            $query-&gt;select('id')\n                  -&gt;from('reservations')\n                  -&gt;where('resource_id', $resourceId)\n                  -&gt;where(function($q) use ($start, $end) {\n                      $q-&gt;whereBetween('start_datetime', [$start, $end])\n                        -&gt;orWhereBetween('end_datetime', [$start, $end])\n                        -&gt;orWhere(function($q) use ($start, $end) {\n                            $q-&gt;where('start_datetime', '&lt;=', $start)\n                              -&gt;where('end_datetime', '&gt;=', $end);\n                        });\n                  });\n        });\n    }\n}\n\n\/\/ \u4e88\u7d04\u7ba1\u7406\u30b5\u30fc\u30d3\u30b9\u306e\u5b9f\u88c5\nclass ReservationService\n{\n    \/\/ \u4e88\u7d04\u53ef\u80fd\u6642\u9593\u67a0\u306e\u78ba\u8a8d\n    public function isTimeSlotAvailable(\n        Carbon $start,\n        Carbon $end,\n        int $resourceId,\n        ?int $excludeReservationId = null\n    ): bool {\n        $query = Reservation::where('resource_id', $resourceId)\n            -&gt;overlapping($start, $end, $resourceId);\n\n        if ($excludeReservationId) {\n            $query-&gt;where('id', '!=', $excludeReservationId);\n        }\n\n        return !$query-&gt;exists();\n    }\n\n    \/\/ \u4e88\u7d04\u4f5c\u6210\u6642\u306e\u691c\u8a3c\n    public function validateAndCreate(array $data): Reservation\n    {\n        if (!$this-&gt;isTimeSlotAvailable(\n            Carbon::parse($data['start_datetime']),\n            Carbon::parse($data['end_datetime']),\n            $data['resource_id']\n        )) {\n            throw new ValidationException('\u6307\u5b9a\u3055\u308c\u305f\u6642\u9593\u67a0\u306f\u65e2\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002');\n        }\n\n        return Reservation::create($data);\n    }\n\n    \/\/ \u5229\u7528\u53ef\u80fd\u306a\u30ea\u30bd\u30fc\u30b9\u306e\u53d6\u5f97\n    public function getAvailableResources(Carbon $start, Carbon $end)\n    {\n        return Resource::whereDoesntExist(function($query) use ($start, $end) {\n            $query-&gt;select('id')\n                  -&gt;from('reservations')\n                  -&gt;whereColumn('resource_id', 'resources.id')\n                  -&gt;where(function($q) use ($start, $end) {\n                      $q-&gt;whereBetween('start_datetime', [$start, $end])\n                        -&gt;orWhereBetween('end_datetime', [$start, $end])\n                        -&gt;orWhere(function($q) use ($start, $end) {\n                            $q-&gt;where('start_datetime', '&lt;=', $start)\n                              -&gt;where('end_datetime', '&gt;=', $end);\n                        });\n                  });\n        })-&gt;get();\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u30d3\u30b8\u30cd\u30b9\u30b7\u30fc\u30f3\u3067\u767a\u751f\u3059\u308b\u8981\u4ef6\u306b\u5bfe\u3057\u3066\u3001Exists\u30e1\u30bd\u30c3\u30c9\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u5404\u5b9f\u88c5\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul 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class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u4f8b\u5916\u51e6\u7406<\/li>\n\n\n\n<li>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7ba1\u7406<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u3092\u53c2\u8003\u306b\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066Exists\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u304b\u3064\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068\u304c\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":[12],"tags":[],"class_list":{"0":"post-2578","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-php","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2578","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=2578"}],"version-history":[{"count":2,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2578\/revisions"}],"predecessor-version":[{"id":2580,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2578\/revisions\/2580"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2578"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2578"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2578"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}