{"id":21197,"date":"2025-10-28T02:56:32","date_gmt":"2025-10-28T02:56:32","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=21197"},"modified":"2025-10-28T02:56:32","modified_gmt":"2025-10-28T02:56:32","slug":"rails-7-1%e3%81%8b%e3%82%897-2%e3%81%b8%e3%81%ae%e3%82%a2%e3%83%83%e3%83%97%e3%82%b0%e3%83%ac%e3%83%bc%e3%83%89%e3%81%a7%e5%ad%a6%e3%82%93%e3%81%a0%e3%81%93%e3%81%a8-spacely-tech-blog","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/21197\/","title":{"rendered":"Rails 7.1\u304b\u30897.2\u3078\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3067\u5b66\u3093\u3060\u3053\u3068 &#8211; Spacely Tech Blog"},"content":{"rendered":"\n<br \/><img decoding=\"async\" src=\"https:\/\/ogimage.blog.st-hatena.com\/26006613498419207\/6802888565300830089\/1761613967\" \/><\/p>\n<div>\n<p>\u3053\u3093\u306b\u3061\u306f\u3001Tony Duong\u3067\u3059\u3002Spacely\u3067<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Rails\">Rails<\/a>\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u3057\u3066\u50cd\u3044\u3066\u304a\u308a\u3001Spacely\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306e\u958b\u767a\u306b\u7a4d\u6975\u7684\u306b\u53d6\u308a\u7d44\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306e\u958b\u767a\u3057\u3066\u3044\u308b\u30b9\u30da\u30fc\u30b9\u30ea\u30fc\u306e\u30b5\u30fc\u30d3\u30b9\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Ruby%20on%20Rails\">Ruby on Rails<\/a>\u306e\u30d0\u30fc\u30b8\u30e7\u30f37.1\u3067\u52d5\u4f5c\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u30017.1\u306eEOL\u306b\u4f34\u3063\u3066\u30d0\u30fc\u30b8\u30e7\u30f37.2\u3078\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3092\u5b9f\u65bd\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u306e\u30ea\u30ea\u30fc\u30b9\u306b\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u5f79\u7acb\u3064\u3044\u304f\u3064\u304b\u306e\u6539\u5584\u304c\u542b\u307e\u308c\u3066\u304a\u308a\u3001\u7279\u306b\u6b21\u306e2\u3064\u306e\u6a5f\u80fd\u306b\u671f\u5f85\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p><a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Rails\">Rails<\/a> 8.0\u306f\u3059\u3067\u306b\u5229\u7528\u53ef\u80fd\u3067\u3057\u305f\u304c\u3001\u30ea\u30b9\u30af\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3001\u4e92\u63db\u6027\u306e\u554f\u984c\u3092\u5207\u308a\u5206\u3051\u308b\u305f\u3081\u306b\u30017.2\u3078\u306e\u6bb5\u968e\u7684\u306a\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u30d1\u30b9\u3092\u9078\u629e\u3057\u307e\u3057\u305f\u3002\u79fb\u884c\u306f\u6bd4\u8f03\u7684\u30b9\u30e0\u30fc\u30ba\u306b\u9032\u3080\u3068\u4e88\u60f3\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u5b9f\u969b\u306b\u306f\u305d\u3046\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3053\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u306b\u3088\u308a\u30015,333\u500b\u306e\u30c6\u30b9\u30c8\u306e\u3046\u3061101\u500b\u304c\u5931\u6557\u3057\u3001\u305d\u306e\u4e2d\u306b\u306f\u8a3a\u65ad\u3068\u4fee\u6b63\u304c\u975e\u5e38\u306b\u56f0\u96e3\u306a\u3082\u306e\u3082\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<h2 id=\"Context\">Context<\/h2>\n<ul>\n<li>\u5404\u30c6\u30b9\u30c8\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u5185\u3067\u5b9f\u884c\u3055\u308c\u3001\u6700\u5f8c\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%ED%A1%BC%A5%EB%A5%D0%A5%C3%A5%AF\">\u30ed\u30fc\u30eb\u30d0\u30c3\u30af<\/a>\u3055\u308c\u308b\u3053\u3068\u3067\u3001\u5404\u30c6\u30b9\u30c8\u304c\u72ec\u7acb\u3057\u305f\u74b0\u5883\u3067\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u8a2d\u5b9a\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\uff1a<\/li>\n<\/ul>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\"><span class=\"synType\">RSpec<\/span>.configure <span class=\"synStatement\">do<\/span> |config|\n  config.use_transactional_fixtures = <span class=\"synConstant\">true<\/span>\n<span class=\"synStatement\">end<\/span>\n<\/pre>\n<ul>\n<li>\u79c1\u305f\u3061\u306eWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u8907\u6570\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u63a5\u7d9a\u3057\u3066\u304a\u308a\u3001\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u3084\u66f4\u65b0\u306e\u305f\u3081\u306b\u305d\u308c\u3089\u306e\u9593\u3067JOIN\u64cd\u4f5c\u3092\u983b\u7e41\u306b\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\"><span class=\"synPreProc\">class<\/span> <span class=\"synType\">RealEstate<\/span> ApplicationRecord\n  connects_to <span class=\"synConstant\">database<\/span>: { <span class=\"synConstant\">writing<\/span>: <span class=\"synConstant\">:real_estates<\/span>, <span class=\"synConstant\">reading<\/span>: <span class=\"synConstant\">:real_estates_replica<\/span> }\n\n  has_many <span class=\"synConstant\">:projects<\/span>, <span class=\"synConstant\">dependent<\/span>: <span class=\"synConstant\">:destroy<\/span>\n<span class=\"synPreProc\">end<\/span>\n\n<span class=\"synPreProc\">class<\/span> <span class=\"synType\">Project<\/span> ApplicationRecord\n  connects_to <span class=\"synConstant\">database<\/span>: { <span class=\"synConstant\">writing<\/span>: <span class=\"synConstant\">:default<\/span>, <span class=\"synConstant\">reading<\/span>: <span class=\"synConstant\">:default_replica<\/span> }\n\n  belongs_to <span class=\"synConstant\">:real_estate<\/span>\n<span class=\"synPreProc\">end<\/span>\n<\/pre>\n<h2 id=\"-ActiveRecordLockWaitTimeout-\u4f8b\u5916\">\u2460 <code>ActiveRecord::LockWaitTimeout<\/code> \u4f8b\u5916<\/h2>\n<p>\u4f55\u3089\u304b\u306e\u7406\u7531\u3067\u3001\u4e00\u90e8\u306e\u30c6\u30b9\u30c8\u3067\u4ee5\u4e0b\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\uff1a<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">ActiveRecord::LockWaitTimeout:\n  Mysql2::Error::TimeoutError: Lock wait timeout exceeded; try restarting transaction<\/pre>\n<p><code>ActiveRecord::LockWaitTimeout<\/code>\u30a8\u30e9\u30fc\u306f\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u304c\u30c6\u30fc\u30d6\u30eb\u3084\u884c\u306e\u30ed\u30c3\u30af\u3092\u53d6\u5f97\u3057\u3088\u3046\u3068\u5f85\u6a5f\u3057\u3066\u3044\u308b\u304c\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%BF%A5%A4%A5%E0%A5%A2%A5%A6%A5%C8\">\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8<\/a>\u671f\u9593\u3092\u8d85\u3048\u305f\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u30c6\u30b9\u30c8\u3068\u30b3\u30fc\u30c9\u3092\u8abf\u67fb\u3057\u305f\u7d50\u679c\u3001\u3044\u304f\u3064\u304b\u306e\u5171\u901a\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u3064\u3051\u307e\u3057\u305f\uff1a<\/p>\n<ul>\n<li>\u30af\u30ed\u30b9\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9JOIN\u304c\u5b58\u5728\u3057\u3066\u3044\u305f<\/li>\n<li>\u4e00\u62ec\u66f4\u65b0\uff08<code>update_all<\/code>\u3084<code>import<\/code>\u3092\u4f7f\u7528\uff09\u6642\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f<\/li>\n<\/ul>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\">\n<span class=\"synPreProc\">require<\/span> <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">rails_helper<\/span><span class=\"synSpecial\">\"<\/span>\n\n<span class=\"synType\">RSpec<\/span>.describe <span class=\"synType\">UpdateProjectsService<\/span>, <span class=\"synConstant\">type<\/span>: <span class=\"synConstant\">:service<\/span> <span class=\"synStatement\">do<\/span>\n  describe <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">#perform<\/span><span class=\"synSpecial\">\"<\/span> <span class=\"synStatement\">do<\/span>\n    let!(<span class=\"synConstant\">:project<\/span>) { create(<span class=\"synConstant\">:project<\/span>) }\n    let!(<span class=\"synConstant\">:real_estate<\/span>) { create(<span class=\"synConstant\">:real_estate<\/span>, <span class=\"synConstant\">available<\/span>: <span class=\"synConstant\">1<\/span>) }\n\n    before <span class=\"synStatement\">do<\/span>\n      project.real_estate = real_estate\n      project.save!\n    <span class=\"synStatement\">end<\/span>\n\n    it <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">runs successfully<\/span><span class=\"synSpecial\">\"<\/span> <span class=\"synStatement\">do<\/span>\n      projects = <span class=\"synType\">Project<\/span>.all.joins(<span class=\"synConstant\">:real_estate<\/span>).where(<span class=\"synConstant\">real_estate<\/span>: { <span class=\"synConstant\">available<\/span>: <span class=\"synConstant\">1<\/span> })\n      projects.update_all(<span class=\"synConstant\">title<\/span>: <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">test<\/span><span class=\"synSpecial\">\"<\/span>) \n    <span class=\"synStatement\">end<\/span>\n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n<\/pre>\n<h3 id=\"\u79c1\u305f\u3061\u306e\u4eee\u8aac-\">\u79c1\u305f\u3061\u306e\u4eee\u8aac \ud83d\udd75<\/h3>\n<p>\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u3057\u3066\u3001\u30c6\u30b9\u30c8\u304c\u3059\u3067\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u5185\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u4eee\u8aac\u3092\u7acb\u3066\u307e\u3057\u305f\u3002<code>update_all<\/code>\u3068<code>import<\/code>\u306f\u66f8\u304d\u8fbc\u307f\u306e\u305f\u3081\u306b\u884c\u3092\u30ed\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u6b63\u78ba\u306a\u539f\u56e0\u306f\u5224\u660e\u3057\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u7c21\u6613\u7684\u306a\u30c6\u30b9\u30c8\u3068\u3057\u3066\u3001<code>use_transactional_fixtures<\/code>\u3092\u7121\u52b9\u306b\u3057\u3066\u307f\u307e\u3057\u305f\uff1a<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\">config.use_transactional_fixtures = <span class=\"synConstant\">false<\/span>\n<\/pre>\n<p>\u30c6\u30b9\u30c8\u304c\u901a\u308a\u307e\u3057\u305f\uff01<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u304c\u539f\u56e0\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u72b6\u614b\u3092\u7dad\u6301\u3057\u305f\u304f\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u306a\u305c\u306a\u3089\u3001\u30c6\u30b9\u30c8\u304c\u72ec\u7acb\u3057\u306a\u304f\u306a\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306e\u8a2d\u5b9a\u3067\u3001\u6761\u4ef6\u4ed8\u304d\u3067<code>use_transactional_fixtures<\/code>\u3092\u7121\u52b9\u306b\u3057\u3088\u3046\u3068\u3057\u307e\u3057\u305f\uff1a<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\">config.before <span class=\"synStatement\">do<\/span> |example|\n  <span class=\"synStatement\">if<\/span> example.metadata[<span class=\"synConstant\">:use_truncation<\/span>]\n    config.use_transactional_fixtures = <span class=\"synConstant\">false<\/span>\n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n\nconfig.after <span class=\"synStatement\">do<\/span> |example|\n  <span class=\"synStatement\">if<\/span> example.metadata[<span class=\"synConstant\">:use_truncation<\/span>]\n    \n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n<\/pre>\n<p>\u3057\u304b\u3057\u3001\u3046\u307e\u304f\u3044\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u4e00\u5ea6<code>use_transactional_fixtures<\/code>\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u30c6\u30b9\u30c8\u5b9f\u884c\u4e2d\u306b\u52d5\u7684\u306b\u5909\u66f4\u3067\u304d\u306a\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\">\n<span class=\"synPreProc\">require<\/span> <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">rails_helper<\/span><span class=\"synSpecial\">\"<\/span>\n\n<span class=\"synType\">RSpec<\/span>.describe <span class=\"synType\">UpdateProjectsService<\/span>, <span class=\"synConstant\">type<\/span>: <span class=\"synConstant\">:service<\/span> <span class=\"synStatement\">do<\/span>\n  describe <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">#perform<\/span><span class=\"synSpecial\">\"<\/span> <span class=\"synStatement\">do<\/span>\n    ...\n    it <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">runs successfully<\/span><span class=\"synSpecial\">\"<\/span>, <span class=\"synConstant\">:use_truncation<\/span> <span class=\"synStatement\">do<\/span>\n      ...\n    <span class=\"synStatement\">end<\/span>\n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n<\/pre>\n<h3 id=\"\u89e3\u6c7a\u7b56-\">\u89e3\u6c7a\u7b56 \u2705<\/h3>\n<p>\u89e3\u6c7a\u7b56\u3068\u3057\u3066\u30c6\u30b9\u30c8\u5b9f\u884c\u524d\u306b\u958b\u3044\u3066\u3044\u308b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u3092\u624b\u52d5\u3067\u30b3\u30df\u30c3\u30c8\u3057\u3066\u9589\u3058\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\">config.before <span class=\"synStatement\">do<\/span> |example|\n  <span class=\"synStatement\">if<\/span> example.metadata[<span class=\"synConstant\">:use_truncation<\/span>]\n    \n    <span class=\"synType\">ActiveRecord<\/span>::<span class=\"synType\">Base<\/span>.connection_handler.connection_pool_list.each <span class=\"synStatement\">do<\/span> |pool|\n      connection = pool.lease_connection\n      transaction_count = connection.open_transactions\n\n      \n      \n      transaction_count.times <span class=\"synStatement\">do<\/span>\n        connection.execute(<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">COMMIT<\/span><span class=\"synSpecial\">\"<\/span>)\n      <span class=\"synStatement\">rescue<\/span> <span class=\"synType\">StandardError<\/span>\n        \n        <span class=\"synStatement\">begin<\/span>\n          connection.execute(<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">ROLLBACK<\/span><span class=\"synSpecial\">\"<\/span>)\n        <span class=\"synStatement\">rescue<\/span> <span class=\"synType\">StandardError<\/span>\n          <span class=\"synConstant\">nil<\/span>\n        <span class=\"synStatement\">end<\/span>\n      <span class=\"synStatement\">end<\/span>\n\n      \n      \n      connection.instance_variable_set(<span class=\"synConstant\">:@transaction_manager<\/span>, <span class=\"synType\">ActiveRecord<\/span>::<span class=\"synType\">ConnectionAdapters<\/span>::<span class=\"synType\">TransactionManager<\/span>.new(connection))\n    <span class=\"synStatement\">end<\/span>\n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n\nconfig.after <span class=\"synStatement\">do<\/span> |example|\n  <span class=\"synStatement\">if<\/span> example.metadata[<span class=\"synConstant\">:use_truncation<\/span>]\n    \n    <span class=\"synType\">ActiveRecord<\/span>::<span class=\"synType\">Base<\/span>.connection_handler.connection_pool_list.each <span class=\"synStatement\">do<\/span> |pool|\n      connection = pool.lease_connection\n\n      \n      <span class=\"synStatement\">begin<\/span>\n        connection.execute(<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">COMMIT<\/span><span class=\"synSpecial\">\"<\/span>) <span class=\"synStatement\">if<\/span> connection.open_transactions.positive?\n      <span class=\"synStatement\">rescue<\/span> <span class=\"synType\">StandardError<\/span>\n        <span class=\"synConstant\">nil<\/span>\n      <span class=\"synStatement\">end<\/span>\n\n      tables_to_truncate = connection.tables - [<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">schema_migrations<\/span><span class=\"synSpecial\">\"<\/span>, <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">ar_internal_metadata<\/span><span class=\"synSpecial\">\"<\/span>]\n      <span class=\"synStatement\">next<\/span> <span class=\"synStatement\">if<\/span> tables_to_truncate.empty?\n\n      connection.execute(<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">SET FOREIGN_KEY_CHECKS = 0<\/span><span class=\"synSpecial\">\"<\/span>)\n      tables_to_truncate.each <span class=\"synStatement\">do<\/span> |table|\n        connection.execute(<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">TRUNCATE TABLE <\/span><span class=\"synSpecial\">#{<\/span>table<span class=\"synSpecial\">}\"<\/span>)\n      <span class=\"synStatement\">end<\/span>\n      connection.execute(<span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">SET FOREIGN_KEY_CHECKS = 1<\/span><span class=\"synSpecial\">\"<\/span>)\n    <span class=\"synStatement\">end<\/span>\n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n<\/pre>\n<p>\u7f8e\u3057\u304f\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3046\u307e\u304f\u3044\u304d\u307e\u3057\u305f\uff01\u5fc5\u8981\u306a\u30c6\u30b9\u30c8\u306b<code>use_truncation<\/code><a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%E1%A5%BF%A5%C7%A1%BC%A5%BF\">\u30e1\u30bf\u30c7\u30fc\u30bf<\/a>\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u30c6\u30b9\u30c8\u304c\u901a\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\">\n<span class=\"synPreProc\">require<\/span> <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">rails_helper<\/span><span class=\"synSpecial\">\"<\/span>\n\n<span class=\"synType\">RSpec<\/span>.describe <span class=\"synType\">UpdateProjectsService<\/span>, <span class=\"synConstant\">type<\/span>: <span class=\"synConstant\">:service<\/span> <span class=\"synStatement\">do<\/span>\n  describe <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">#perform<\/span><span class=\"synSpecial\">\"<\/span> <span class=\"synStatement\">do<\/span>\n    ...\n    it <span class=\"synSpecial\">\"<\/span><span class=\"synConstant\">runs successfully<\/span><span class=\"synSpecial\">\"<\/span>, <span class=\"synConstant\">:use_truncation<\/span> <span class=\"synStatement\">do<\/span>\n      ...\n    <span class=\"synStatement\">end<\/span>\n  <span class=\"synStatement\">end<\/span>\n<span class=\"synStatement\">end<\/span>\n<\/pre>\n<h2 id=\"-\u30af\u30ed\u30b9\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9JOIN\u304c\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u306a\u3044\">\u2461 \u30af\u30ed\u30b9\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9JOIN\u304c\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u306a\u3044<\/h2>\n<p>\u4e00\u90e8\u306e\u30c6\u30b9\u30c8\u3067\u306f\u3001\u30ec\u30b3\u30fc\u30c9\u304c\u4f5c\u6210\u3055\u308c\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u8907\u6570\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u7d50\u5408\u3059\u308b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/SQL\">SQL<\/a>\u30af\u30a8\u30ea\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\"><span class=\"synType\">RealEstate<\/span>.joins(<span class=\"synConstant\">:company<\/span>).count\n=&gt; <span class=\"synConstant\">0<\/span>\n\n<span class=\"synType\">RealEstate<\/span>.first.company\n=&gt; <\/pre>\n<h3 id=\"\u79c1\u305f\u3061\u306e\u4eee\u8aac--1\">\u79c1\u305f\u3061\u306e\u4eee\u8aac\ud83d\udd75<\/h3>\n<p>\u5404\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u72ec\u81ea\u306e<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u3092\u958b\u59cb\u3057\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5909\u66f4\u304c\u30b3\u30df\u30c3\u30c8\u3055\u308c\u307e\u305b\u3093\u3002\u5404\u30c6\u30b9\u30c8\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u5185\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%AB%A5%D7%A5%BB%A5%EB%B2%BD\">\u30ab\u30d7\u30bb\u30eb\u5316<\/a>\u3055\u308c\u3066\u3044\u307e\u3059\uff08\u5b9f\u969b\u306b\u306f\u8907\u6570\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u3042\u308b\u305f\u3081\u3001\u79c1\u305f\u3061\u306e\u5834\u5408\u306f\u8907\u6570\u306e<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u3067\u3059\uff09\u3002<\/p>\n<p><code\/>\u306e\u306e\u30c6\u30fc\u30d6\u30eb\u3068<code\/>\u306e\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3057\u3066\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3068\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u305d\u308c\u305e\u308c\u4f5c\u6210\u3057\u3066\u3082\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u5206\u96e2\u306b\u3088\u308a\u4f55\u3082\u53d6\u5f97\u3067\u304d\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3 id=\"\u89e3\u6c7a\u7b56--1\">\u89e3\u6c7a\u7b56\u2705<\/h3>\n<p>\u8abf\u67fb\u306e\u7d50\u679c\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u5185\u3067\u30b3\u30df\u30c3\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u5909\u66f4\u3092\u8aad\u307f\u53d6\u308b\u3053\u3068\u3092\u53ef\u80fd\u306b\u3059\u308b\u305f\u3081\u306b\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u5206\u96e2\u30ec\u30d9\u30eb\u3092\u8abf\u6574\u3067\u304d\u308b\u3053\u3068\u3092\u767a\u898b\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3064\u306e\u5206\u96e2\u30ec\u30d9\u30eb\u304c\u3042\u308a\u307e\u3059\uff1a<a target=\"_blank\" href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.4\/en\/innodb-transaction-isolation-levels.html#isolevel_read-uncommitted\"><code\/><\/a>\u3001<a target=\"_blank\" href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.4\/en\/innodb-transaction-isolation-levels.html#isolevel_read-committed\"><code\/><\/a>\u3001<a target=\"_blank\" href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.4\/en\/innodb-transaction-isolation-levels.html#isolevel_repeatable-read\"><code\/><\/a>\u3001<a target=\"_blank\" href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.4\/en\/innodb-transaction-isolation-levels.html#isolevel_serializable\"><code\/><\/a>\u3002<\/p>\n<p>\u53c2\u8003\uff1a<a target=\"_blank\" href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.4\/en\/innodb-transaction-isolation-levels.html\"\/><\/p>\n<p>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5206\u96e2\u30ec\u30d9\u30eb\u306f<code\/>\u3067\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u306f\u4ed6\u306e<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u306b\u3088\u3063\u3066\u30b3\u30df\u30c3\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u307f\u3092\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5206\u96e2\u30ec\u30d9\u30eb\u3092<code\/>\u306b\u5909\u66f4\u3057\u307e\u3057\u305f\u3002<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Rails\"\/>\u306f<code\/>\u30d5\u30a1\u30a4\u30eb\u3067\u3053\u308c\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\uff1a<\/p>\n<pre class=\"code lang-ruby\" data-lang=\"ruby\" data-unlink=\"\"><span class=\"synConstant\"\/><span class=\"synType\"\/><span class=\"synConstant\"\/><span class=\"synConstant\"\/><span class=\"synConstant\"\/><span class=\"synSpecial\"\/><span class=\"synConstant\"\/><span class=\"synSpecial\"\/><span class=\"synConstant\"\/><span class=\"synType\"\/><span class=\"synConstant\"\/><span class=\"synConstant\"\/><span class=\"synConstant\"\/><span class=\"synSpecial\"\/><span class=\"synConstant\"\/><span class=\"synSpecial\"\/><\/pre>\n<p>\u554f\u984c\u306e\u3042\u3063\u305f\u30c6\u30b9\u30c8\u3092\u518d\u5ea6\u5b9f\u884c\u3059\u308b\u3068\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u3068\u304d\u3068\u540c\u3058\u3088\u3046\u306b\u901a\u308a\u307e\u3057\u305f\uff01\ud83c\udf89<\/p>\n<p>\u3053\u308c\u306f\u9069\u5207\u306a\u4fee\u6b63\u3068\u3044\u3046\u3088\u308a\u3082\u56de\u907f\u7b56\u306e\u3088\u3046\u306b\u611f\u3058\u3089\u308c\u307e\u3059\u3002\u4ed6\u306e\u89e3\u6c7a\u7b56\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001\u554f\u984c\u306f\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u306e\u307f\u767a\u751f\u3059\u308b\u305f\u3081\u3001\u3068\u308a\u3042\u3048\u305a\u3053\u308c\u3067\u9032\u3081\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2 id=\"\u3053\u308c\u3089\u306e\u554f\u984c\u306e\u539f\u56e0\u306f\u4f55\u304b\">\u3053\u308c\u3089\u306e\u554f\u984c\u306e\u539f\u56e0\u306f\u4f55\u304b\uff1f<\/h2>\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306e\u539f\u56e0\u3068\u306a\u3063\u305f\u6b63\u78ba\u306a\u30b3\u30fc\u30c9\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p><a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Rails\"\/>\u3067\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C8%A5%E9%A5%F3%A5%B6%A5%AF%A5%B7%A5%E7%A5%F3\">\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/a>\u51e6\u7406\u306b\u95a2\u3059\u308b\u3044\u304f\u3064\u304b\u306e\u5909\u66f4\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\uff1a<\/p>\n<p>\u3053\u308c\u3089\u306e\u5909\u66f4\u304c\u3001\u8907\u6570\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u74b0\u5883\u306b\u304a\u3044\u3066\u7834\u58ca\u7684\u306a\u52d5\u4f5c\u3092\u5f15\u304d\u8d77\u3053\u3057\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u6839\u672c\u539f\u56e0\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001\u3055\u3089\u306a\u308b\u8abf\u67fb\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2 id=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/h2>\n<p>\u4e3b\u8981\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u306f\u3001\u7279\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Rails\"\/>\u306e\u3088\u3046\u306a\u5927\u898f\u6a21\u306a<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%D5%A5%EC%A1%BC%A5%E0%A5%EF%A1%BC%A5%AF\">\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af<\/a>\u3067\u306f\u56f0\u96e3\u3092\u4f34\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u3068\u3001\u554f\u984c\u3068\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3092\u3088\u308a\u6df1\u304f\u6398\u308a\u4e0b\u3052\u308b\u3053\u3068\u3092\u4f59\u5100\u306a\u304f\u3055\u308c\u3001\u305d\u308c\u304c\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u3057\u3066\u306e\u6210\u9577\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<p>\u3064\u3044\u306b<a target=\"_blank\" class=\"keyword\" 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