{"id":18387,"date":"2022-10-30T17:27:43","date_gmt":"2022-10-30T08:27:43","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=18387"},"modified":"2023-05-27T17:38:53","modified_gmt":"2023-05-27T08:38:53","slug":"%e3%80%90rails%e3%80%91%e3%80%8crubocop%e3%80%8d%e3%81%ae%e5%b0%8e%e5%85%a5","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=18387","title":{"rendered":"\u3010Rails\u3011\u300crubocop\u300d\u306e\u5c0e\u5165\u3001\u30bd\u30fc\u30b9\u30ec\u30d3\u30e5\u30fc\u306e\u30dd\u30a4\u30f3\u30c8\u306a\u3069"},"content":{"rendered":"<p>Gemfile\u306b\u4ee5\u4e0b\u3092\u8ffd\u52a0<\/p>\n<pre class=\"lang:default decode:true \">group :development, :test do\r\n  gem 'rubocop-rails', require: false\r\nend<\/pre>\n<p>\u6b21\u306b\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3002<\/p>\n<pre class=\"lang:default decode:true\">rubocop --init<\/pre>\n<p>\u305d\u3046\u3059\u308b\u3068<span style=\"color: #ff0000;\"><strong>\u300crubocop.yml\u300d<\/strong><\/span>\u3068\u3044\u3046\u30d5\u30a1\u30a4\u30eb\u304c\u3067\u304d\u308b\u3002\u4ee5\u4e0b\u306e\u8a2d\u5b9a\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/p>\n<pre class=\"lang:default decode:true \">require:\r\n  - rubocop-rails<\/pre>\n<h2>\u5b9f\u884c<\/h2>\n<pre class=\"lang:default decode:true \">rubocop<\/pre>\n<h2>\u81ea\u52d5\u4fee\u6b63<\/h2>\n<pre class=\"lang:default decode:true \">rubocop -a<\/pre>\n<h2>.rubocop_todo.yml<\/h2>\n<pre class=\"lang:default decode:true \">rubocop --auto-gen-config\r\n<\/pre>\n<p>rubocop\u306f\u521d\u671f\u72b6\u614b\u3060\u3068\u6307\u6458\u304c\u304b\u306a\u308a\u53b3\u3057\u3044\u3067\u3059\u3002\u4e00\u65e6\u4eca\u51fa\u3066\u308b\u30a8\u30e9\u30fc\u3092\u7121\u8996\u3059\u308b\u3088\u3046\u306a\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<p>\u4e2d\u8eab\u306b\u306f\u6307\u6458\u3092\u7121\u8996\u3059\u308b\u8a2d\u5b9a\u304c\u3044\u308d\u3044\u308d\u66f8\u304b\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\u6700\u521d\u306f\u3053\u308c\u3092\u5168\u3066\u9069\u7528\u3057\u3066\u304a\u3044\u3066\u3053\u306e\u6307\u6458\u306e\u7121\u8996\u306f\u5fc5\u8981\u3060\u3068\u601d\u3063\u305f\u3089\u5f90\u3005\u306b\u3001\u300c.rubocop.yml\u300d\u306e\u65b9\u306b\u79fb\u3057\u305f\u308a\u3001rubocop_todo.yml\u306e\u4e2d\u304b\u3089\u524a\u9664\u3057\u305f\u308a\u3068\u5bfe\u5fdc\u3092\u3057\u3066\u3044\u304f\u904b\u7528\u304c\u60f3\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>Ruby\u81ea\u4f53\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n<h3>\u53c2\u8003\uff08ruby-style-guide\uff09<\/h3>\n<p>https:\/\/github.com\/rubocop-hq\/ruby-style-guide<\/p>\n<h3>\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u5247\u3001\u63a8\u5968\u3055\u308c\u308b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u65b9\u6cd5<\/h3>\n<ul>\n<li>\u30a4\u30f3\u30c7\u30f3\u30c8\u306f\u30b9\u30da\u30fc\u30b92\u3064<\/li>\n<li>for\u6587\u306f\u3069\u3046\u3057\u3066\u3082\u4f7f\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3068\u3044\u3046\u660e\u78ba\u306a\u7406\u7531\u304c\u306a\u3051\u308c\u3070\u4f7f\u308f\u306a\u3044\u3002<\/li>\n<li>\u5f15\u6570\u306e\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u969b\u306f()\u3092\u7701\u7565\u3057\u3066\u8a18\u8f09\u3059\u308b\u3002\uff08\u4f8b\uff1apeople.methods()\u3067\u306f\u306a\u304f\u3001people.methods\u3068\u3059\u308b\u3002)<\/li>\n<li>\u771f\u507d\u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u305f\u5834\u5408\u306f\u30e1\u30bd\u30c3\u30c9\u540d\u306e\u6700\u5f8c\u306b\u300c?\u300d\u304c\u3064\u3044\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\u306f\u30e1\u30bd\u30c3\u30c9\u540d\u306e\u6700\u5f8c\u306b\u300c!\u300d\u304c\u3064\u3044\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>\u30d6\u30ed\u30c3\u30af\u3092\u4e2d\u30ab\u30c3\u30b3\u300c{}\u300d\u3067\u8868\u73fe\u3059\u308b\u969b\u306f\u304b\u3063\u3053\u3068\u5024\u306e\u9593\u3092\u958b\u3051\u308b\u3053\u3068\uff08\u4f8b\uff1a{ num })<\/li>\n<li>\u914d\u5217\u306f\u7a4d\u6975\u7684\u306b\u300c%\u8a18\u6cd5\u300d\u3092\u4f7f\u3046\u3053\u3068\u3002\uff08%w\u3001%W\u3001%i\uff09<\/li>\n<li>\u5206\u5c90\u306e\u306a\u3044if\u6587\u306e\u5834\u5408\u306f\u5f8c\u7f6eif\u3092\u4f7f\u3046\u3053\u3068\u3092\u691c\u8a0e\u3059\u308b\u3053\u3068\u3002<\/li>\n<li>\u5206\u5c90\u304c\u3042\u308b\u304c\u5358\u7d14\u306aif\u6587\u306e\u5834\u5408\u306f\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u3053\u3068\u3092\u691c\u8a0e\u3059\u308b\u3053\u3068\u3002<\/li>\n<li>\u8ad6\u7406\u6f14\u7b97\u5b50\u306fand\u3001or\u3068\u3044\u3046\u3088\u3046\u306a\u82f1\u5358\u8a9e\u3067\u306f\u306a\u304f\u8a18\u53f7(&amp;&amp;\u3001||)\u3067\u66f8\u304f\u3053\u3068\u3002<\/li>\n<\/ul>\n<h3>\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u89e3\u6790\u30c4\u30fc\u30eb<\/h3>\n<p>ruby-style-guide\u306e\u30eb\u30fc\u30eb\u306b\u6cbf\u3063\u3066\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b<span style=\"color: #ff0000;\"><strong>\u300cRubocop(\u30eb\u30dc\u30b3\u30c3\u30d7)\u300d<\/strong><\/span>\u3068\u3044\u3046\u30c4\u30fc\u30eb\u3092\u3053\u306eruby-style-guide\u306e\u4f5c\u8005\u306e\u65b9\u304c\u4f5c\u6210\u3057\u3066\u304a\u308a\u307e\u3059\u3002\u5b9f\u969b\u306e\u73fe\u5834\u3067\u3082<\/p>\n<h2>Rails\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n<h3>\u5168\u4f53<\/h3>\n<ul>\n<li>\u30e1\u30bd\u30c3\u30c9\u540d\u3001\u5909\u6570\u540d\u306e\u540d\u524d\u304c\u9069\u5207\u304b<\/li>\n<li>\u914d\u5217\u304c\u8907\u6570\u306a\u306e\u306b\u5358\u6570\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b\u3002<\/li>\n<li>\u7570\u306a\u308b\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u5165\u3063\u3066\u3044\u308b\u3068\u8aa4\u89e3\u3055\u308c\u308b\u3088\u3046\u306a\u5909\u6570\u540d\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b\u3002<\/li>\n<li>\u8907\u6570\u30e2\u30c7\u30eb\u3084\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u5171\u901a\u6a5f\u80fd\u304cconcerns\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30e2\u30b8\u30e5\u30fc\u30eb\u3068\u3057\u3066\u5207\u308a\u51fa\u3055\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>blank?\u304c\u591a\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3002<\/li>\n<li>\u30ed\u30b0\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u3059\u3050\u306b\u308f\u304b\u308b\u304b\u3002\u308f\u304b\u3089\u306a\u3044\u306a\u3089\u30b3\u30e1\u30f3\u30c8\u304c\u3042\u308b\u304b\u3002<\/li>\n<li>\u65e5\u6642\u30d5\u30a9\u30fc\u30de\u30c3\u30c8(strftime\uff09\u306f\u5171\u901a\u5316\u3057\u3066\u3044\u308b\u304b\u3002<\/li>\n<\/ul>\n<h3>\u8a18\u8ff0\u5834\u6240<\/h3>\n<ul>\n<li>\u30b3\u30fc\u30c9\u306e\u8a18\u8ff0\u5834\u6240\u304c\u9069\u5207\u304b\uff1f\uff08\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u3001\u30e2\u30c7\u30eb\u7b49\uff09<\/li>\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u8a18\u8ff0\u5834\u6240\u3068\u3057\u3066\u30af\u30e9\u30b9\/\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4f7f\u3044\u5206\u3051\u306f\u9069\u5207\u304b\u3002<\/li>\n<\/ul>\n<h3>\u30d3\u30e5\u30fc<\/h3>\n<h4>\u30c7\u30a3\u30ec\u30af\u30c8\u30ea<\/h4>\n<p>app\/views\/\u30d3\u30e5\u30fc\u540d\uff08\u4f8b\uff1ausers)<\/p>\n<h3>\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9<\/h3>\n<ul>\n<li>\u30d5\u30a3\u30eb\u30bf(before_action\u7b49)\u306e\u5229\u7528\u304c\u9069\u5207\u304b\u3002<\/li>\n<li>URL\u8a2d\u8a08\u304c\u9069\u5207\u304b\u3002<\/li>\n<li>route.rb\u304c\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u5225\u306b\u3061\u3083\u3093\u3068\u5206\u304b\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>render\u524d\u306bflash\u3067\u306f\u306a\u304fflash.now\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>Strong Parameters\u304c\u9069\u5207\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>\u30d1\u30e9\u30e1\u30fc\u30bf\u52a0\u5de5\u3067\u5909\u5316\u3055\u305b\u305f\u304f\u306a\u3044\u30c7\u30fc\u30bf\u3092\u30bb\u30c3\u30b7\u30e7\u30f3\u3067\u306f\u306a\u304f\u30d1\u30e9\u30e1\u30fc\u30bf\u7d4c\u7531\u3067\u6b21\u30da\u30fc\u30b8\u306b\u9001\u3063\u3066\u306a\u3044\u304b\u3002<\/li>\n<li>\u76f4\u6253\u3061\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b\u3002<\/li>\n<\/ul>\n<h4>\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u540d<\/h4>\n<p>\u30e2\u30c7\u30eb\u306e\u8907\u6570\u5f62(\u4f8b\uff1ausers)\u304c\u4e00\u822c\u7684\u3060\u304c\u3001\u30d5\u30a9\u30fc\u30e0\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u3068\u304binfo\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u3068\u304bDB\u3068\u76f4\u63a5\u9023\u643a\u3057\u306a\u3044\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u306e\u5834\u5408\u306f\u8907\u6570\u5f62\u306b\u3057\u306a\u3044\u5834\u5408\u3082\u3042\u308b\u3002<\/p>\n<h5>\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30d5\u30a1\u30a4\u30eb(app\/controller\/\u914d\u4e0b\uff09<\/h5>\n<p>\u30b9\u30cd\u30fc\u30af\u30b1\u30fc\u30b9\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">\u5c0f\u6587\u5b57\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc\u540d_controller.rb\uff08\u4f8b\uff1ausers_controller.rb\uff09<\/pre>\n<h3>\u30e2\u30c7\u30eb<\/h3>\n<ul>\n<li>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af(before_save\u7b49)\u304c\u9069\u5207\u304b\u3002<\/li>\n<li>save\u3068save!\u306e\u4f7f\u3044\u5206\u3051<\/li>\n<li>\u623b\u308a\u5024\u304c\u30a8\u30e9\u30fc\u306b\u306a\u308b\u5834\u5408\u306e\u78ba\u8a8d\u3092\u3057\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>ActiveRecord\u306e\u95a2\u9023\u540d\u304c\u9069\u5207\u304b\u3002<\/li>\n<li>ActiveRecord\u306e\u95a2\u9023\u306edependent: :destroy\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>\u6c4e\u7528\u7684\u306a\u691c\u7d22\u6761\u4ef6\u304cscope\u3068\u3057\u3066\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u304b\u3002<\/li>\n<li>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u9069\u5207\u304b\u3002<\/li>\n<li>SQL\u5b9f\u884c\u56de\u6570\u306e\u554f\u984c\u306f\u306a\u3044\u304b\u3002<\/li>\n<\/ul>\n<h4>\u30e2\u30c7\u30eb\u540d<\/h4>\n<ul>\n<li>\u5358\u6570\u5f62\u306e\u540d\u8a5e\u3067\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<li class=\"p1\">\u57fa\u672c\u7684\u306b\u306fdog\u7b49\u306e\u300c\u53ef\u7b97\u540d\u8a5e\u300d\u3092\u4f7f\u3046\u3002\uff08<span class=\"s1\">infomartion<\/span>\u306e\u3088\u3046\u306b\u975e\u53ef\u7b97\u540d\u8a5e\u306f\u4f7f\u308f\u306a\u3044\u3002\uff09<\/li>\n<\/ul>\n<h4>\u30af\u30e9\u30b9\u540d<\/h4>\n<p>\u5148\u982d\u5927\u6587\u5b57\u3067\u5f8c\u306f\u5c0f\u6587\u5b57\u306b\u3059\u308b\u3002\uff08\u4f8b\uff1aUser\uff09<\/p>\n<h5>\u30e2\u30c7\u30eb\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u3084\u300crails g model\u300d\u30b3\u30de\u30f3\u30c9\u5b9f\u884c\u6642\u306e\u6307\u5b9a<\/h5>\n<p>\u5168\u3066\u5c0f\u6587\u5b57\u3067\u30e2\u30c7\u30eb\u540d\u3092\u6307\u5b9a\u3059\u308b\u3002(\u4f8b\uff1auser)<\/p>\n<h4>\u30c6\u30fc\u30d6\u30eb\u540d<\/h4>\n<p>\u30e2\u30c7\u30eb\u306e\u8907\u6570\u5f62\u306b\u3059\u308b\u3002(\u4f8b\uff1ausers)<\/p>\n<h3>\u30d8\u30eb\u30d1\u30fc<\/h3>\n<ul>\n<li>\u30e1\u30bd\u30c3\u30c9\u540d\u304c\u885d\u7a81\u3057\u306a\u3044\u304b\u3002<\/li>\n<li>\u30b0\u30ed\u30fc\u30d0\u30eb\u3067\u898b\u3066\u610f\u5473\u304c\u901a\u308b\u304b\u3002<\/li>\n<\/ul>\n<h2>\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04<\/h2>\n<p>RuboCop\u3067\u81ea\u52d5\u5316\u3059\u308b\u306e\u306f\u3042\u308a\u3002\uff08\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u5fc5\u8981\u3060\u304c\uff09<\/p>\n<p class=\"p1\"><b>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u89b3\u70b9<\/b><\/p>\n<p class=\"p3\">#\u5168\u4f53<\/p>\n<p class=\"p3\">##\u6761\u4ef6\u6587<\/p>\n<p class=\"p3\">\u30fb\u672a\u5b9a\u7fa9\u306a\u3089\u4ee3\u5165\u3059\u308b\u3068\u3044\u3046\u8868\u73fe\u306f\u300c||=\u300d\u3092\u4f7f\u3046\u3088\u3046\u306b\u3059\u308b\u3002<\/p>\n<p class=\"p3\">\u30fb\u300cif<span class=\"Apple-converted-space\">\u00a0 <\/span>+ not\u300d\u3067\u306f\u306a\u304f\u300cunless\u300d\u3092\u4f7f\u3046\u3002<\/p>\n<p class=\"p3\">\u30fb\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u884c\u6570\u3092\u6e1b\u3089\u3059\u3002<\/p>\n<p class=\"p3\">\u30fb== true\u3084== false\u3001== nil\u3092\u660e\u793a\u7684\u306b\u66f8\u304b\u306a\u3044<\/p>\n<p class=\"p3\">##\u30e1\u30bd\u30c3\u30c9<\/p>\n<p class=\"p3\">\u30fb\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306f\u300creturn\u300d\u3092\u66f8\u304b\u306a\u3044\u3002<\/p>\n<p class=\"p3\">\u30fb\u7279\u5b9a\u6761\u4ef6\u3067\u3057\u304b\u53c2\u7167\u3057\u306a\u3044\u5909\u6570\u3092\u4f7f\u3063\u3066\u3044\u306a\u3044\u304b\u3002<\/p>\n<p class=\"p3\">\u3000\u2192\u3060\u3063\u305f\u3089\u4e00\u756a\u4e0a\u306e\u5909\u6570\u306fnil\u3067\u5ba3\u8a00\u3057\u3061\u3083\u3063\u3066\u3001\u00a0when :fulfill_item\u00a0\u306e\u4e2d\u306b\u5165\u3063\u305f\u3068\u3053\u308d\u3067||=\u3067\u5ba3\u8a00\u3059\u308c\u3070\u7121\u99c4\u306a\u3044\u3002<\/p>\n<p class=\"p3\">\u30fb\u30e1\u30bd\u30c3\u30c9\u540d\u306f\u539f\u5247\u52d5\u8a5e\u306b\u3059\u308b\u3002<\/p>\n<p class=\"p3\">##\u6587\u5b57\u5217<\/p>\n<p class=\"p3\">\u30fb\"+\u201d\u3067\u306f\u306a\u304f\"#{ }\"\u3067\u6587\u5b57\u5217\u3092\u9023\u7d50\u3059\u308b<\/p>\n<p class=\"p3\">\u30fb\u8907\u6570\u884c\u306b\u308f\u305f\u308b\u6587\u5b57\u5217\u306f\u30d2\u30a2\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u4f7f\u3046<\/p>\n<p class=\"p3\">\u30fb\u4e07\u304c\u4e00\u5909\u66f4\u3055\u308c\u308b\u3068\u56f0\u308b\u306e\u3067\u3001\u5b9a\u6570\u306ffreeze\u3055\u305b\u308b<\/p>\n<p class=\"p3\">\u30fb\u5927\u304d\u306a\u6570\u5024\u3092\u5ba3\u8a00\u3059\u308b\u5834\u5408\u3001\"_\"\u3092\u5165\u308c\u3066\u8aad\u307f\u3084\u3059\u304f\u3059\u308b<\/p>\n<p class=\"p3\">\u30fbblank\uff1f\u3001present?\u306e\u4f7f\u3044\u5206\u3051\u3002<\/p>\n<p class=\"p3\">##\u914d\u5217<\/p>\n<p class=\"p3\">\u30fb\u914d\u5217\u3092\u4f5c\u308b\u3068\u304d\u3001[ ]\u306e\u4ee3\u308f\u308a\u306b%w( )\u3001%i( )\u3092\u4f7f\u3046<\/p>\n<p class=\"p3\">\u30fb\u914d\u5217\u306emap\u3067\u914d\u5217\u3092\u9806\u756a\u306b\u51e6\u7406\u3059\u308b\u3068\u304d\u3001\"object.method\"\u306e\u4ee3\u308f\u308a\u306b\"&amp;:method\"\u3092\u4f7f\u3046<\/p>\n<p class=\"p3\">\u30fb\u914d\u5217\u306e\u4fbf\u5229\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3044\u308b\u304b\u3002\uff08find\u3001findIndex\u3001select\u3001map)<\/p>\n<p class=\"p3\">\u3000\u2192JavaScript\u3068\u540c\u3058\u3002<\/p>\n<p class=\"p3\">\u3000\u2192\u4e0a\u3067\u8a18\u8f09\u3057\u305f\u901a\u308a\u300c&amp;\u300d\u3067\u53d7\u3051\u308b\u3053\u3068\u3002<\/p>\n<p class=\"p3\">##\u30cf\u30c3\u30b7\u30e5<\/p>\n<p class=\"p3\">\u30fb\u30cf\u30c3\u30b7\u30e5\u306e\u30ad\u30fc\u306b\u306f\u6587\u5b57\u5217\u3067\u306f\u306a\u304f\u30b7\u30f3\u30dc\u30eb\u3092\u4f7f\u3046<\/p>\n<p class=\"p4\"><a href=\"https:\/\/qiita.com\/jnchito\/items\/dedb3b889ab226933ccf\">https:\/\/qiita.com\/jnchito\/items\/dedb3b889ab226933ccf<\/a><\/p>\n<p class=\"p3\">#Model<\/p>\n<p class=\"p3\">\u30fbmap\u3068plunk\u3001select\u306e\u4f7f\u3044\u5206\u3051\u3002<\/p>\n<p class=\"p3\">\u3000\u2192DB\u304b\u3089\u76f4\u63a5\u62bd\u51fa\u3059\u308b\u5834\u5408\u306fplunk\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3089\u53d6\u5f97\u3059\u308b\u5834\u5408\u306fmap\u304c\u901f\u3044\u3002<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000<a href=\"https:\/\/doruby.jp\/users\/kodama\/entries\/map%E3%81%A8pluck\">https:\/\/doruby.jp\/users\/kodama\/entries\/map%E3%81%A8pluck<\/a><\/span><\/p>\n<p class=\"p3\">\u3000select\uff1aActiveRecord\u304c\u8fd4\u308b\u3002<\/p>\n<p class=\"p3\">\u3000plunk\uff1a\u914d\u5217\u304c\u8fd4\u308b\u3002<\/p>\n<p class=\"p3\">\u3000\u2192\u300c\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u914d\u5217\u306b\u6574\u5f62\u3057\u3066\u5165\u308c\u76f4\u3059\u5834\u5408\u300d\u306fplunk\u306e\u65b9\u304c\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308b\u3002<\/p>\n<p class=\"p3\">\u3000##select\u306e\u30e1\u30ea\u30c3\u30c8<\/p>\n<p class=\"p3\">\u3000\u3000\u30fb\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u3063\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u305b\u308b\u3002(where\u3001distinct\u3001find\u7b49\uff09<\/p>\n<p class=\"p3\">\u3000##plunk\u306e\u30c7\u30e1\u30ea\u30c3\u30c8<\/p>\n<p class=\"p3\">\u3000\u3000\u30fb\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u3066\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u66f4\u65b0\u51e6\u7406\u306a\u3069\u3092\u884c\u3046\u4e8b\u304c\u51fa\u6765\u306a\u3044<\/p>\n<p class=\"p3\">\u3000\u3000\u30fb\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u3063\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u4e8b\u304c\u51fa\u6765\u306a\u3044<\/p>\n<p class=\"p3\">\u3000\u3000\u30fb\u90fd\u5ea6SQL\u3092\u767a\u884c\u3059\u308b\u306e\u3067\u5834\u5408\u306b\u3088\u3063\u3066\u306fN+1\u306e\u69d8\u306a\u72b6\u614b\u3082\u8d77\u304d\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n<p class=\"p3\">\u3000##\u7591\u554f<\/p>\n<p class=\"p3\">\u3000\u2192\u914d\u5217\u3068ActiveRecord\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u306f\u3069\u3063\u3061\u304c\u3044\u3044\u306e\u304b\uff1f\u4ee5\u4e0b\u8a18\u4e8b\u3060\u3068ActiveRecord\u3068\u3057\u3066\u3044\u308b\u3002<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000\u3000<a href=\"https:\/\/qiita.com\/jnchito\/items\/dedb3b889ab226933ccf\">https:\/\/qiita.com\/jnchito\/items\/dedb3b889ab226933ccf<\/a>\u3000\u3000<\/span><\/p>\n<p class=\"p3\">\u30fbwhere\u3068merge\u306e\u4f7f\u3044\u5206\u3051<\/p>\n<p class=\"p3\">\u3000\u2192\u30b0\u30eb\u30fc\u30d4\u30f3\u30b0\u3067\u4f7f\u3048\u308b\u3089\u3057\u3044\u3002<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000<a href=\"https:\/\/qiita.com\/hirohero\/items\/8194b8012b9a5f6e592e\">https:\/\/qiita.com\/hirohero\/items\/8194b8012b9a5f6e592e<\/a><\/span><\/p>\n<p class=\"p3\">\u3000\u2192\u7d50\u5408\u5148\u306e\u30c6\u30fc\u30d6\u30eb\u306ejoin\u306e\u6761\u4ef6\u306e\u8a18\u8ff0\u306b\u4f7f\u3048\u308b\u3089\u3057\u3044\u3002model\u306escope\u3067\u5171\u901a\u5316\u3057\u305f\u3044\u5834\u5408\u306b\u4f7f\u3046\u611f\u3058\u304b\u3002<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000<a href=\"https:\/\/nakaearth.hatenadiary.org\/entry\/20141017\/1413543723\">https:\/\/nakaearth.hatenadiary.org\/entry\/20141017\/1413543723<\/a><\/span><\/p>\n<p class=\"p3\">\u30fbjoins\u3068includes\u306e\u4f7f\u3044\u5206\u3051\u3002<\/p>\n<p class=\"p3\">\u3000\u2192includes\u306f\u3001N+1\u554f\u984c\u306b\u6c17\u3092\u4f7f\u3048\u308b\u3089\u3057\u3044\u3002<\/p>\n<p class=\"p3\">\u3000joins\uff1a\u7d50\u5408\u3059\u308b\u30e2\u30c7\u30eb\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u306a\u3044\u306e\u3067\u30e1\u30e2\u30ea\u6d88\u8cbb\u304c\u5c11\u306a\u304f\u3066\u6e08\u307f\u307e\u3059\u304c\u3001\u305d\u308c\u306b\u3088\u308a N+1 \u554f\u984c\u304c\u8d77\u304d\u308b\u3002<\/p>\n<p class=\"p3\"><span class=\"Apple-converted-space\">\u00a0\u00a0 <\/span>\u30fbincludes\u3068select\u306f\u4f75\u7528\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u305d\u306e\u5834\u5408\u306fjoins\u3092\u4f7f\u3046\u3089\u3057\u3044\u3002<\/p>\n<p class=\"p3\">\u30fb\u7279\u5b9a\u306e\u5834\u5408\u306e\u307f\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306f\u3001if\u3092\u4f7f\u3046\u3002\uff08validates\u3067\u4f5c\u3089\u306a\u304f\u3066\u3082\u826f\u3044\u3002\uff09<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000<a href=\"https:\/\/doruby.jp\/users\/nakanishi\/entries\/with_options_if_\">https:\/\/doruby.jp\/users\/nakanishi\/entries\/with_options_if_<\/a><\/span><\/p>\n<p class=\"p3\">\u30fb\u7279\u5b9a\u306e\u5834\u5408\u306e\u307f\u8907\u6570\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306f\u3001with_options\u3092\u4f7f\u3046\u3002<\/p>\n<p class=\"p3\">\u30fbActiveRecord\u306ecount\u3088\u308aRuby\u306elength\u3092\u4f7f\u3046\u3002\uff08\u4e0d\u8981\u306a\u30af\u30a8\u30ea\u547c\u3073\u51fa\u3057\u3092\u6e1b\u3089\u305b\u308b\u3002\uff09<\/p>\n<p class=\"p3\">#\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc<\/p>\n<p class=\"p3\">\u30fbscope\u3092\u4f7f\u3063\u3066\u691c\u7d22\u30ed\u30b8\u30c3\u30af\u306f\u30e2\u30c7\u30eb\u306b\u79fb\u3059\u3002<\/p>\n<p class=\"p3\">\u30fb\u30ed\u30b8\u30c3\u30af\u306f\u30e2\u30c7\u30eb\u306b\u79fb\u3059\u3002<\/p>\n<p class=\"p3\">#view<\/p>\n<p class=\"p3\">\u30fb\u30ed\u30b8\u30c3\u30af\u306fhelper\u3078\u5206\u96e2\u3059\u308b\u3002<\/p>\n<p class=\"p3\">\u30fbpartial\u5316<\/p>\n<p class=\"p3\">#spec<\/p>\n<p class=\"p3\">\u30fblet\u3068let!\u3001before\u306e\u4f7f\u3044\u5206\u3051\u3002<\/p>\n<p class=\"p3\">\u3000\u2192\u7279\u5b9a\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u307f\u3057\u304b\u5909\u6570\u3092\u4f7f\u3044\u305f\u304f\u306a\u3044\u5834\u5408\u306flet\u3092\u4f7f\u3063\u305f\u65b9\u304c\u826f\u3044\u3002<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000\u3000<a href=\"https:\/\/qiita.com\/jnchito\/items\/cdd9eef2ed193267c651\">https:\/\/qiita.com\/jnchito\/items\/cdd9eef2ed193267c651<\/a><\/span><\/p>\n<p class=\"p3\">\u3000\u2192let\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u308b\u3093\u3060\u3051\u3069\u3082\u3001\u305d\u306e\u7bc4\u56f2\u306fbefore\u301cit\u301cafter\u306e\u7bc4\u56f2\u3067\u4e00\u56de\u3057\u304b\u521d\u671f\u5316\u3055\u308c\u306a\u3044\u3068\u3044\u3046\u610f\u5473\u3060\u305d\u3046\u306a\u3002<\/p>\n<p class=\"p3\">\u3000\u3000\u3064\u307e\u308a\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3042\u3093\u307e\u308a\u610f\u5473\u304c\u306a\u304b\u3063\u305f\u306e\u3060\u3063\u305f\u3002<\/p>\n<p class=\"p4\"><span class=\"s1\">\u3000\u3000<a href=\"https:\/\/sugamasao.hatenablog.com\/entry\/20120623\/1340441871\">https:\/\/sugamasao.hatenablog.com\/entry\/20120623\/1340441871<\/a><\/span><\/p>\n<p class=\"p3\">\u3000\u2192let!\u3068before\u306f\u540c\u3058\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u547c\u3070\u308c\u308b\u3002\uff08\u4f7f\u3044\u308f\u306a\u3044\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u5834\u5408\u3067\u3082\u5b9f\u884c\u3055\u308c\u3066\u3057\u307e\u3046\u3002\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"Gemfile\u306b\u4ee5\u4e0b\u3092\u8ffd\u52a0 group :development, :test do gem 'rubocop-rails', require: false end \u6b21\u306b\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3002 rubocop --i 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