{"id":7630,"date":"2019-11-30T15:46:07","date_gmt":"2019-11-30T06:46:07","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=7630"},"modified":"2023-05-27T22:58:12","modified_gmt":"2023-05-27T13:58:12","slug":"%e3%80%90ruby-on-rails%e3%80%91%e3%83%9e%e3%82%a4%e3%82%b0%e3%83%ac%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=7630","title":{"rendered":"\u3010Ruby on Rails\u3011\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3001\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u66f8\u304d\u65b9"},"content":{"rendered":"<p>Rails\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u3082\u5c11\u3057\u89e3\u8aac\u3055\u305b\u3066\u9802\u304d\u307e\u3057\u305f\u3002<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"rJag2jpV93\"><p><a href=\"http:\/\/www.code-magagine.com\/?p=4480\">\u3010Ruby on Rails\u3011\u306e\u300cO\/R\u30de\u30c3\u30d1\u30fc\u300d\u3067\u3042\u308b\u300cActiveRecord\uff08\u30a2\u30af\u30c6\u30a3\u30d6\u30ec\u30b3\u30fc\u30c9\uff09\u300d\u3001Scaffolding\u3067\u96db\u5f62\u30a2\u30d7\u30ea\u4f5c\u6210\u307e\u3067<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/www.code-magagine.com\/?p=4480&#038;embed=true#?secret=rJag2jpV93\" data-secret=\"rJag2jpV93\" width=\"500\" height=\"282\" title=\"&#8220;\u3010Ruby on Rails\u3011\u306e\u300cO\/R\u30de\u30c3\u30d1\u30fc\u300d\u3067\u3042\u308b\u300cActiveRecord\uff08\u30a2\u30af\u30c6\u30a3\u30d6\u30ec\u30b3\u30fc\u30c9\uff09\u300d\u3001Scaffolding\u3067\u96db\u5f62\u30a2\u30d7\u30ea\u4f5c\u6210\u307e\u3067&#8221; &#8212; \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30de\u30ac\u30b8\u30f3\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u3084\u53d6\u308a\u6d88\u3057\u306b\u306f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304b\u308c\u305f\u64cd\u4f5c\u3092\u9069\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u305d\u3082\u305d\u3082\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3068\u306f\uff1f<\/h2>\n<p>Rails\u306b\u304a\u3044\u3066DB\u3078\u306e\u5909\u66f4\u3092\u8907\u6570\u306e\u958b\u767a\u8005\u304c\u30b9\u30c8\u30ec\u30b9\u306a\u304f\u30b7\u30a7\u30a2\u3059\u308b\u3053\u3068\u3092\u76ee\u7684\u3068\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<h3>\u57fa\u672c\u7684\u306b\u306f\u904e\u53bb\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306f\u3044\u3058\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u3002<\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u65b0\u3057\u3044\u30e2\u30c7\u30eb\u3092\u4f5c\u6210\u3057\u3066\u305d\u306e\u5f8c\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3057\u305f\u3044\u3068\u306a\u3063\u305f\u3068\u3057\u3066\u3082\u904e\u53bb\u306e\u30e2\u30c7\u30eb\u3092\u4f5c\u6210\u3059\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u52a0\u3059\u308b\u3068\u8a00\u3063\u305f\u3053\u3068\u306f\u57fa\u672c\u7684\u306b\u3057\u3066\u306f\u3044\u3051\u306a\u3044\u3067\u3059\u3002\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u601d\u60f3\u3068\u3057\u3066\u306f<span style=\"color: #ff0000;\"><strong>\u30d5\u30a1\u30a4\u30eb\u81ea\u4f53\u306e\u7f8e\u3057\u3055\u3068\u3044\u3046\u3088\u308a\u3082\u904e\u53bb\u306e\u5c65\u6b74\u3092\u3057\u3063\u304b\u308a\u7ba1\u7406\u3059\u308b\u3053\u3068\u306b\u3042\u308b<\/strong><\/span>\u306e\u3067\u3059\u3002<\/p>\n<h3>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u304c\u591a\u304f\u306a\u3063\u3066\u304d\u305f\u3089<\/h3>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306f\u904e\u53bb\u306e\u5c65\u6b74\u3092\u7a4d\u307f\u91cd\u306d\u308b\u306e\u3067\u591a\u304f\u306a\u3063\u3066\u304d\u307e\u3059\u3002\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5f53\u3066\u308b\u306e\u306b\u6642\u9593\u304c\u304b\u304b\u3063\u305f\u308a\u30b3\u30fc\u30c9\u3092\u63a2\u3057\u8f9b\u304f\u306a\u308b\u3068\u3044\u3046\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b\u306e\u3067<span style=\"color: #ff0000;\"><strong>Squasher<\/strong><\/span>\u3068\u3044\u3046gem\u3092\u4f7f\u3063\u3066\u8907\u6570\u30d5\u30a1\u30a4\u30eb\u3092\u96c6\u7d04\u3059\u308b\u3053\u3068\u3092\u691c\u8a0e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u7ba1\u7406\u3055\u308c\u3066\u3044\u308b<\/h2>\n<p>1\u3064\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u304c1\u3064\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002<span style=\"color: #ff0000;\"><strong>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u9069\u7528\u3059\u308c\u3070DB\u30b9\u30ad\u30fc\u30de\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e00<\/strong><\/span><span style=\"color: #ff0000;\"><strong>\u3064\u3042\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u9069\u7528\u305a\u307f\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4e00\u3064\u53d6\u308a\u6d88\u3059\u3053\u3068\u3067\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e00\u3064\u4e0b\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/strong><\/span><\/p>\n<p>\u3053\u308c\u306fRails\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306b\u4f5c\u6210\u3055\u308c\u308b<span style=\"color: #ff0000;\"><strong>\u300cschema_migrations\u300d<\/strong><\/span>\u3068\u3044\u3046\u30c6\u30fc\u30d6\u30eb\u3092\u901a\u3058\u3066\u3069\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\uff08\u30d0\u30fc\u30b8\u30e7\u30f3\uff09\u304c\u9069\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u306e\u30c7\u30fc\u30bf\u304c\u4fdd\u5b58\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>rails db:migrate<\/h3>\n<p>\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e0a\u3052\u308b\u969b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u3059\u3002\u300crails migrate\u30b3\u30de\u30f3\u30c9\u300d\u306f\u4eee\u306b\u9069\u7528\u3057\u3066\u3044\u306a\u3044\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u3042\u3063\u305f\u5834\u5408\u3082\u9069\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3060\u3051\u9078\u3093\u3067\u9069\u7528\u3057\u3066\u308c\u307e\u3059\u3002<\/p>\n<h3>rails db:rollback<\/h3>\n<p>\u4e00\u3064\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e0b\u3052\u308b\u969b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u3059\u3002<\/p>\n<h3>rails db:rollback STEP=N<\/h3>\n<p>\u56de\u6570\u3092\u6307\u5b9a\u3057\u3066N\u500b\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e0b\u3052\u308b\u969b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u3059\u3002<\/p>\n<h3>rails db:reset<\/h3>\n<p>\u5168\u3066\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u307e\u3059\u3002<\/p>\n<h3>rails db:migrate:reset<\/h3>\n<p>\u5168\u3066\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u3066\u3001\u65b0\u305f\u306b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u3057\u76f4\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30ea\u30ea\u30fc\u30b9\u6642\u306e\u6ce8\u610f<\/h2>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u30ea\u30dd\u30b8\u30c8\u30ea\u306b\u5165\u308c\u308b\u969b\u306f\u3001<span style=\"color: #ff0000;\"><strong>\u30d0\u30fc\u30b8\u30e7\u30f3\u30a2\u30c3\u30d7\u3060\u3051\u3067\u306a\u304f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3082\u3067\u304d\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u5165\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/strong><\/span><\/p>\n<ul>\n<li>\u300crails db:migrate\u300d\u3067\u81ea\u5206\u306e\u66f8\u3044\u305f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u671f\u5f85\u901a\u308a\u52d5\u4f5c\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/li>\n<li>\u300crails db:migrate:redo\u300d\u3067\u81ea\u5206\u306e\u66f8\u3044\u305f\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e0b\u3052\u308b\u969b\u306b\u30c8\u30e9\u30d6\u30eb\u304c\u767a\u751f\u3057\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ul>\n<h3>rails db:migrate:redo<\/h3>\n<p>\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e0b\u3052\u305f\u5f8c\u306b\u3082\u3046\u4e00\u5ea6\u4e0a\u3052\u3066\u304f\u308c\u308b\u306e\u3067\u3001<span style=\"color: #ff0000;\"><strong>\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u623b\u3059\u51e6\u7406\u304c\u60f3\u5b9a\u3069\u304a\u308a\u306b\u52d5\u4f5c\u3057\u3066\u3044\u308b\u304b\u3092\u7c21\u5358\u306b\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/strong><\/span>\u5b9f\u884c\u5f8c\u306f\u624b\u5143\u306e\u74b0\u5883\u306f\u6700\u65b0\u306e\u74b0\u5883\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u554f\u984c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u6b21\u7b2c\u3059\u3050\u306b\u6b21\u306e\u5de5\u7a0b\u306b\u79fb\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306f\u74b0\u5883\u3054\u3068\u306b\u9069\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/h2>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30b3\u30de\u30f3\u30c9\u306f\u4e0b\u8a18\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u3053\u306e\u5834\u5408\u306f<span style=\"color: #ff0000;\"><strong>\u958b\u767a\u7528DB<\/strong><\/span>\u306b\u5bfe\u3057\u3066\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">rails db:migrate<\/pre>\n<p>\u305d\u308c\u305e\u308c\u306e\u74b0\u5883\u3067\u9069\u7528\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h3>\u672c\u756a\u74b0\u5883<\/h3>\n<pre class=\"lang:default decode:true \">rails db:migrate RAILS_ENV=production<\/pre>\n<h3>\u30c6\u30b9\u30c8\u74b0\u5883<\/h3>\n<pre class=\"lang:default decode:true \">rails db:migrate RAILS_ENV=test<\/pre>\n<h3>\u30b5\u30fc\u30d0\u30fc\u4e0a\u3067\u76f4\u63a5DB\u3092\u3044\u3058\u3063\u305f\u5834\u5408<\/h3>\n<p>\u7dca\u6025\u6642\u3068\u304b\u306b\u306fDB\u3092\u76f4\u63a5\u64cd\u4f5c\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\uff08\u30ab\u30e9\u30e0\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u52a0\u3048\u308b\u7b49\uff09\u3001\u305d\u306e\u5834\u5408\u306f\u5f8c\u304b\u3089\u3067\u3082\u826f\u3044\u306e\u3067\u5fc5\u305a\u305d\u306e\u4f5c\u696d\u306b\u5bfe\u5fdc\u3059\u308b\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u306f\u4e00\u610f\u306b\u3059\u308b\u3053\u3068<\/h2>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u306f\u30a2\u30d7\u30ea\u5185\u3067\u4e00\u610f\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30c6\u30fc\u30d6\u30eb\u306e\u65b0\u898f\u4f5c\u6210\u306f\u901a\u5e38\u306f\u4e00\u56de\u3057\u304b\u306a\u3044\u306e\u3067\u88ab\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u304c<span style=\"color: #ff0000;\"><strong>\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0\u7b49\u306f\u4f55\u5ea6\u3082\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u547d\u540d\u306b\u306f\u6c17\u3092\u914d\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/strong><\/span><\/p>\n<h3>\u30c6\u30fc\u30d6\u30eb\u306e\u65b0\u898f\u4f5c\u6210<\/h3>\n<p>Create\u30c6\u30fc\u30d6\u30eb\u540d<\/p>\n<h3>\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0<\/h3>\n<p>Add\u30ab\u30e9\u30e0\u540dTo\u30c6\u30fc\u30d6\u30eb\u540d<\/p>\n<h2>db\/schema.rb<\/h2>\n<p>Rails\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u304c\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30b3\u30de\u30f3\u30c9\u5b9f\u884c\u6642\u306b\u81ea\u52d5\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u304d\u306a\u3044\u30b1\u30fc\u30b9<\/h2>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u3067\u304d\u306a\u3044\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3057\u3066\u3057\u307e\u3063\u305f\u305f\u3081\u5143\u306e\u30c7\u30fc\u30bf\u306b\u623b\u305b\u306a\u3044\u30b1\u30fc\u30b9<\/li>\n<\/ul>\n<h3>\u5bfe\u51e6\u65b9\u6cd5<\/h3>\n<h4>\u30ab\u30e9\u30e0\u306f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3059\u308b\u304c\u30c7\u30fc\u30bf\u306e\u5fa9\u6d3b\u306f\u884c\u308f\u306a\u3044\u3002<\/h4>\n<p>\u30c7\u30fc\u30bf\u3092\u7528\u610f\u3057\u306a\u304f\u3066\u3082\u958b\u767a\u4e0a\u652f\u969c\u304c\u306a\u3044\u5834\u5408\u306f\u3053\u306e\u9078\u629e\u80a2\u306f\u3042\u308a\u3067\u3059\u3002\u307e\u305f\u3001\u652f\u969c\u304c\u3042\u308b\u5834\u5408\u3067\u3082\u4eee\u306e\u30c7\u30fc\u30bf\u3092\u7528\u610f\u3059\u308b\u3068\u8a00\u3063\u305f\u3053\u3068\u3092\u884c\u3046\u65b9\u6cd5\u3082\u3042\u308a\u3067\u3059\u3002<\/p>\n<h4>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7981\u6b62\u3059\u308b\u3002<\/h4>\n<p>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u51e6\u7406\u306e\u4e2d\u3067<span style=\"color: #ff0000;\"><strong>\u300cActiveRecord::IrreversibleMigration\u30a8\u30e9\u30fc\u300d<\/strong><\/span>\u3092raise\u3057\u3066\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7981\u6b62\u3057\u307e\u3059\u3002\u3064\u307e\u308aDB\u306e\u72b6\u614b\u3092\u4ee5\u524d\u306e\u72b6\u614b\u306b\u623b\u3059\u3053\u3068\u3092\u8ae6\u3081\u308b\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<h4>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306f\u7981\u6b62\u306b\u3057\u306a\u3044\u304c\u4f55\u3082\u3057\u306a\u3044\u3002<\/h4>\n<p>\u3053\u308c\u306f\u5143\u3005\u306e\u30c7\u30fc\u30bf\u304c\u30df\u30b9\u3067\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u304c\u6b63\u3057\u3044\u5834\u5408\u306b\u9078\u629e\u3059\u308b\u65b9\u6cd5\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30c6\u30fc\u30d6\u30eb\u306e\u4f5c\u6210<\/h2>\n<h3>\u81ea\u52d5\u751f\u6210\u30b3\u30de\u30f3\u30c9<\/h3>\n<p class=\"p1\">\u30e2\u30c7\u30eb\u306e\u751f\u6210\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u305f\u969b\u306b\u81ea\u52d5\u3067\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3082\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">rails g model \u30e2\u30c7\u30eb\u540d \u30ab\u30e9\u30e0\u540d:\u30c7\u30fc\u30bf\u578b(string\u7b49\uff09<\/pre>\n<h2>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u66f8\u304d\u65b9<\/h2>\n<h3>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u30e1\u30bd\u30c3\u30c9<\/h3>\n<h4>change\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>\u30c6\u30fc\u30d6\u30eb\u306e\u65b0\u898f\u4f5c\u6210\u3084\u4fee\u6b63\u3092\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002up\/down\u3068\u7570\u306a\u308a<span style=\"color: #ff0000;\"><b>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u81ea\u52d5\u3067\u53cd\u8ee2\u3057\u3066\u884c\u3063\u3066\u304f\u308c\u308b\u306e\u3067\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002\uff08add_column\u3067\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3057\u305f\u5f8c\u306f\u53cd\u8ee2\u3057\u3066remove_column\u3067\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3057\u3066\u304f\u308c\u307e\u3059\u3002\uff09<\/b><\/span><\/p>\n<h4>up\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>\u30de\u30a4\u30b0\u30ec\u30fc\u30c8\u3057\u305f\u969b\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406\u3067\u3059\u3002\u3053\u3053\u306b\u8a18\u8ff0\u3057\u305f\u5185\u5bb9\u306fdown\u30e1\u30bd\u30c3\u30c9\u3067\u5143\u306b\u623b\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<h4>down\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3057\u305f\u969b\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406\u3067\u3059\u3002up\u3067\u5909\u66f4\u3057\u305f\u3082\u306e\u304c\u5143\u306b\u623b\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<h3>change\u30e1\u30bd\u30c3\u30c9\u3068up\/down\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n<ul>\n<li>\u300c\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3057\u305f\u3044\u5834\u5408\u300d\u306fchange\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057<span style=\"color: #ff0000;\"><strong>\u300c\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3057\u305f\u3044\u5834\u5408\u300d\u306fup\/down\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<h4>\u7406\u7531<\/h4>\n<p>delete_column\u3067\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3059\u308b\u5834\u5408\u306f\u578b\u60c5\u5831(\u6587\u5b57\u304b\u6570\u5024\u304b\u4e0d\u660e)\u3092\u4fdd\u6301\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u3001<span style=\"color: #ff0000;\"><strong>change\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u81ea\u52d5\u3067\u53cd\u8ee2\u3057\u3066\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3059\u308b\u3068\u3044\u3046\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/strong><\/span>\u305d\u306e\u5834\u5408\u306fup\/down\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u8eab<\/h3>\n<pre class=\"lang:default decode:true\">    create_table :comments do |t|\r\n      t.references :\u30ab\u30e9\u30e01, foreign_key: true\r\n      t.string :\u30ab\u30e9\u30e02\r\n      t.text :\u30ab\u30e9\u30e03\r\n\r\n      t.timestamps\r\n    end<\/pre>\n<h4>t.references :\u30ab\u30e9\u30e01, foreign_key: true<\/h4>\n<p>\u5916\u90e8\u30ad\u30fc\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e0b\u8a18\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u81ea\u52d5\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">rails g model \u30e2\u30c7\u30eb\u540d \u30ab\u30e9\u30e0\u540d:references<\/pre>\n<div>\n<h4>t.text :\u30ab\u30e9\u30e0\u540d, null:false<\/h4>\n<\/div>\n<div>\u30ab\u30e9\u30e0\u3092<span style=\"color: #ff0000;\"><strong>\u300cNOT NULL\u5236\u7d04\u300d<\/strong><\/span>\u3068\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/div>\n<h4>\u30e6\u30cb\u30fc\u30af\u30ad\u30fc\u5236\u7d04<\/h4>\n<p>\u4e0b\u8a18\u306e\u3088\u3046\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u306f<span style=\"color: #ff0000;\"><strong>\u30e6\u30cb\u30fc\u30af\u30ad\u30fc\uff08\u4e00\u610f\u5236\u7d04\uff09\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<div>\n<pre class=\"lang:default decode:true\">  def change\r\n    create_table :users do |t|\r\n\u3000\u3000\u3000\u3000\u5404\u30ab\u30e9\u30e0\u306e\u60c5\u5831\r\n    end\r\n    add_index :users, :\u30e6\u30cb\u30fc\u30af\u306b\u3057\u305f\u3044\u30ab\u30e9\u30e0\u540d, unique: true\r\n  end<\/pre>\n<h2>\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0\u53ca\u3073\u524a\u9664<\/h2>\n<\/div>\n<h3>\u81ea\u52d5\u751f\u6210\u30b3\u30de\u30f3\u30c9<\/h3>\n<pre class=\"lang:default decode:true\">rails g migration \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u540d \u8ffd\u52a0\u3084\u524a\u9664\u3059\u308b\u30ab\u30e9\u30e0:\u30c7\u30fc\u30bf\u578b<\/pre>\n<h3>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u66f8\u304d\u65b9<\/h3>\n<h4>\u8ffd\u52a0<\/h4>\n<pre class=\"lang:default decode:true\">  def change\r\n    add_column :\u30e2\u30c7\u30eb\u540d(users\u7b49\uff09, :\u8ffd\u52a0\u3059\u308b\u30ab\u30e9\u30e0\u540d, :\u30c7\u30fc\u30bf\u578b\r\n  end<\/pre>\n<h4>\u524a\u9664<\/h4>\n<pre class=\"lang:default decode:true  \">  def change\r\n    remove_column :\u30e2\u30c7\u30eb\u540d\uff08users\u7b49\uff09, :\u524a\u9664\u3059\u308b\u30ab\u30e9\u30e0\u540d(admin\u7b49), :\u30c7\u30fc\u30bf\u578b\uff08boolean\u7b49\uff09\r\n  end<\/pre>\n","protected":false},"excerpt":{"rendered":"Rails\u306e\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u3082\u5c11\u3057\u89e3\u8aac\u3055\u305b\u3066\u9802\u304d\u307e\u3057\u305f\u3002 \u3010Ruby on Rails\u3011\u306e\u300cO\/R\u30de\u30c3\u30d1\u30fc\u300d\u3067\u3042\u308b\u300cActiveRecord\uff08\u30a2\u30af\u30c6\u30a3\u30d6\u30ec\u30b3\u30fc\u30c9\uff09\u300d\u3001Scaffolding\u3067\u96db\u5f62\u30a2\u30d7 [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[36],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/7630"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7630"}],"version-history":[{"count":18,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/7630\/revisions"}],"predecessor-version":[{"id":20538,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/7630\/revisions\/20538"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7630"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}