{"id":63480,"date":"2018-07-12T09:48:52","date_gmt":"2018-07-12T00:48:52","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=63480"},"modified":"2024-05-06T11:49:37","modified_gmt":"2024-05-06T02:49:37","slug":"%e3%80%90rails%e5%85%a5%e9%96%80%e3%80%91%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e7%a2%ba%e8%aa%8d%e3%81%97%e3%82%88%e3%81%86","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/63480","title":{"rendered":"\u3010Rails\u5165\u9580\u3011\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b\u65b9\u6cd5\uff08destroy\/delete\uff09\u3092\u78ba\u8a8d\u3057\u3088\u3046"},"content":{"rendered":"

Ruby on Rails\uff08\u4ee5\u964d\u3001Rails\uff09\u3067\u300c\u4f55\u304b\u300d\u3092\u524a\u9664\u3059\u308b<\/strong><\/span>\u30b7\u30fc\u30f3\u306f\u3068\u3066\u3082\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u30c7\u30fc\u30bf\u306f\u3082\u3061\u308d\u3093\u3067\u3059\u304c\u3001Model<\/strong><\/span>\u3001Controller<\/strong><\/span>\u3001scaffold\u3067\u4f5c\u6210\u3057\u305f\u67a0\u7d44\u307f<\/strong><\/span>\u306a\u3069\u3001\u3044\u3063\u305f\u3093\u4f5c\u6210\u3057\u305f\u3082\u306e\u306f\u3059\u3079\u3066\u524a\u9664\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u305d\u3053\u3067\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4e3b\u306b\u30c7\u30fc\u30bf\u306e\u524a\u9664\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u3001\u6700\u5f8c\u306bModel\u3084Controller\u306a\u3069\u3092\u524a\u9664\u3059\u308b\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

\u30c7\u30fc\u30bf\u306e\u524a\u9664\u65b9\u6cd5\u3067\u306f\u3001\u8ad6\u7406\u524a\u9664<\/strong><\/span>\u3068\u547c\u3070\u308c\u308b\u65b9\u6cd5\u3082\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

\u305d\u308c\u3067\u306f\u3001\u884c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n

\u52d5\u4f5c\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306eWeb\u30a2\u30d7\u30ea\u3092\u4f5c\u6210\u3059\u308b<\/h2>\n

Rails\u306e\u30c7\u30fc\u30bf\u306e\u524a\u9664\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001Rails\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066Web\u30a2\u30d7\u30ea\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n

\uff081\uff09Rails<\/strong><\/span>\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/p>\n

\u79c1\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3001VirtualBox\u3067\u4f5c\u6210\u3057\u305f\u4eee\u60f3\u30d1\u30bd\u30b3\u30f3\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305fLinux Mint\u306b\u3001Rails\u306e\u958b\u767a\u74b0\u5883\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u57fa\u672c\u7684\u306b\u306f\u8a18\u4e8b\u306e\u624b\u9806\u306b\u5f93\u3063\u3066\u64cd\u4f5c\u3057\u307e\u3059\u304c\u3001app\/samurai\/sample1\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u6210\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001app\/samurai\/delete-demo\u30c7\u30a3\u30ec\u30af\u30c8\u30ea<\/strong><\/span>\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u307e\u305f\u3001Rails\u3092\u8d77\u52d5\u3057\u3066\u3001\u30d6\u30e9\u30a6\u30b6\u3067\u753b\u9762\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u3089\u3001\u3044\u3063\u305f\u3093Rails\u3092\u7d42\u4e86\u3057\u3066\u304b\u3089\u6b21\u306b\u9032\u307f\u307e\u3059\u3002<\/p>\n \n

\n
\n
\n \n <\/div>\n
\n
\u521d\u5fc3\u8005\u3067\u3082\u304b\u3093\u305f\u3093\uff01Ruby on Rails \u306e\u958b\u767a\u74b0\u5883\u306e\u69cb\u7bc9\u624b\u9806\uff08Mac\/Windows \u4e21\u5bfe\u5fdc\uff09<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n

Linux Mint\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n \n

\n
\n
\n \n <\/div>\n
\n
Linux Mint Cinnamon\u30a8\u30c7\u30a3\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u307f\u3088\u3046<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n

\uff082\uff09\u300c\u7aef\u672b\u300d<\/strong><\/span>\u3067\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u30921\u884c\u305a\u3064\u9806\u756a\u306b\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n

bin\/rails generate scaffold User name:string\r\nbin\/rails generate scaffold Post user_id:integer title:string month:integer\r\nbin\/rails db:migrate\r\nbin\/rails console<\/pre>\n
\uff083\uff09\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n
User.create(id:1, name:\"\u5c71\u7530\u592a\u90ce\")\r\nUser.create(id:2, name:\"\u9577\u702c\u6765\")\r\nUser.create(id:3, name:\"\u7acb\u5ddd\u88d5\u7f8e\")\r\nUser.create(id:4, name:\"\u524d\u7530\u9054\u90ce\")\r\nUser.create(id:5, name:\"\u7d30\u5ddd\u4fee\u4e8c\")\r\nUser.create(id:6, name:\"\u6728\u6751\u62d3\u78e8\")\r\nPost.create(id:1, user_id:5,title:\"\u697d\u3057\u3044\u4f11\u65e5\u306e\u904e\u3054\u3057\u65b9\" ,month:3)\r\nPost.create(id:2, user_id:1,title:\"\u5148\u65e5\u306e\u65c5\u884c\u3067\u306e\u8a71\" ,month:2)\r\nPost.create(id:3, user_id:3,title:\"\u6628\u65e5\u306e\u51fa\u6765\u4e8b\" ,month:12)\r\nPost.create(id:4, user_id:3,title:\"\u5c71\u767b\u308a\u306b\u884c\u304d\u307e\u3057\u305f\" ,month:8)\r\nPost.create(id:5, user_id:4,title:\"\u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f\" ,month:4)\r\nPost.create(id:6, user_id:2,title:\"\u6700\u8fd1\u5c11\u3057\u6c17\u306b\u306a\u3063\u305f\u3053\u3068\" ,month:1)\r\nPost.create(id:7, user_id:4,title:\"\u30e9\u30f3\u30cb\u30f3\u30b0\u306e\u30b3\u30c4\" ,month:9)\r\nPost.create(id:8, user_id:3,title:\"Ruby on Rails\u306e\u65e5\" ,month:9)\r\nexit<\/pre>\n
User\u30c6\u30fc\u30d6\u30eb\u3068Post\u30c6\u30fc\u30d6\u30eb\u306b\u30c7\u30fc\u30bf\u304c\u5165\u529b\u3055\u308c\u3001Rails\u30b3\u30f3\u30bd\u30fc\u30eb\u304c\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n
\u6b21\u306bUser\u30c6\u30fc\u30d6\u30eb\u3068Post\u30c6\u30fc\u30d6\u30eb\u3092\u95a2\u9023\u4ed8\u3051\u3001User\u306e\u30c7\u30fc\u30bf\u304c\u524a\u9664\u3055\u308c\u305f\u3068\u304d\u306b\u3001\u95a2\u9023\u3059\u308bPost\u306e\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
\uff085\uff09app\/models\/user.rb<\/strong><\/span>\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7de8\u96c6\u3057\u307e\u3059\u3002<\/p>\n
\u5909\u66f4\u524d\uff1a<\/p>\n
class User < ApplicationRecord\r\nend<\/pre>\n
\u5909\u66f4\u5f8c\uff1a<\/p>\n
class User < ApplicationRecord\r\n  has_many :posts, dependent: :destroy\r\nend<\/pre>\n
\u6700\u5f8c\u306bRails\u30b5\u30fc\u30d0\u30fc\u3092\u8d77\u52d5\u3057\u3066\u3001\u6e96\u5099\u5b8c\u4e86\u3067\u3059\u3002<\/p>\n
\uff086\uff09\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n
bin\/rails server<\/pre>\n
\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\uff08\u30c6\u30fc\u30d6\u30eb\uff09\u304b\u3089\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b<\/h2>\n
\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\uff08\u30c6\u30fc\u30d6\u30eb\uff09\u304b\u3089\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b\u65b9\u6cd5\u306f\u4e3b\u306b4\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t
\u30e1\u30bd\u30c3\u30c9<\/th>\u8aac\u660e<\/th>\u95a2\u9023\u30c7\u30fc\u30bf\u306e\u524a\u9664<\/th>\n<\/tr>\n<\/thead>\n
destroy<\/td>\u30c7\u30fc\u30bf\u30921\u4ef6\u524a\u9664\u3059\u308b<\/td>\u5bfe\u8c61\u30c7\u30fc\u30bf\u3060\u3051\u3067\u306a\u304f\u3001\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u3082\u524a\u9664\u3059\u308b<\/td>\n<\/tr>\n
destroy_all<\/td>where()\u3068\u3042\u308f\u305b\u3066\u4f7f\u7528\u3057\u3001\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b<\/td>\u5bfe\u8c61\u30c7\u30fc\u30bf\u3060\u3051\u3067\u306a\u304f\u3001\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u3082\u524a\u9664\u3059\u308b<\/td>\n<\/tr>\n
delete<\/td>\u30c7\u30fc\u30bf\u30921\u4ef6\u524a\u9664\u3059\u308b
\n<\/td>		\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u306f\u524a\u9664\u3057\u306a\u3044<\/td>\n<\/tr>\n
delete_all<\/td>where()\u3068\u3042\u308f\u305b\u3066\u4f7f\u7528\u3057\u3001\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b<\/td>\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u306f\u524a\u9664\u3057\u306a\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n
destroy<\/h3>\n
destroy\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u30921\u4ef6\u524a\u9664\u3059\u308b<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n
\u5bfe\u8c61\u30c7\u30fc\u30bf\u3060\u3051\u3067\u306a\u304f\u3001\u30e2\u30c7\u30eb\u30af\u30e9\u30b9\u3067dependent: :destroy<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u3066\u95a2\u9023\u4ed8\u3051\u305f\u30c7\u30fc\u30bf\u3082\u81ea\u52d5\u7684\u306b\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u65e9\u901f\u3001\u300cid:3, name:”\u7acb\u5ddd\u88d5\u7f8e”\u300d<\/strong><\/span>\u3092\u524a\u9664\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u95a2\u9023\u3059\u308bPost\u30c7\u30fc\u30bf\u3082\u524a\u9664\u3055\u308c\u308b\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
\uff081\uff09\u65b0\u3057\u3044\u300c\u7aef\u672b\u300d<\/strong><\/span>\u3092\u8d77\u52d5\u3057\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u30921\u884c\u305a\u3064\u9806\u756a\u306b\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n
cd app\/samurai\/delete-demo\r\nbin\/rails console<\/pre>\n
\uff082\uff09\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n
User.find(3).destroy<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
  User Load (1.2ms)  SELECT  \"users\".* FROM \"users\" WHERE \"users\".\"id\" = ? LIMIT ?  [[\"id\", 3], [\"LIMIT\", 1]]\r\n   (0.1ms)  begin transaction\r\n  Post Load (0.1ms)  SELECT \"posts\".* FROM \"posts\" WHERE \"posts\".\"user_id\" = ?  [[\"user_id\", 3]]\r\n  SQL (0.7ms)  DELETE FROM \"posts\" WHERE \"posts\".\"id\" = ?  [[\"id\", 3]]\r\n  SQL (0.1ms)  DELETE FROM \"posts\" WHERE \"posts\".\"id\" = ?  [[\"id\", 4]]\r\n  SQL (0.1ms)  DELETE FROM \"posts\" WHERE \"posts\".\"id\" = ?  [[\"id\", 8]]\r\n  SQL (0.1ms)  DELETE FROM \"users\" WHERE \"users\".\"id\" = ?  [[\"id\", 3]]\r\n   (10.8ms)  commit transaction\r\n=> #<\/pre>\n
\uff083\uff09\u30d6\u30e9\u30a6\u30b6\u3067\u300chttp:\/\/localhost:3000\/users\u300d<\/strong><\/span>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002<\/p>\n
\"\"<\/p>\n
\u300cid:3, name:”\u7acb\u5ddd\u88d5\u7f8e”\u300d\u304c\u524a\u9664\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/strong><\/span><\/p>\n
\uff084\uff09\u30d6\u30e9\u30a6\u30b6\u3067\u300chttp:\/\/localhost:3000\/posts\u300d<\/strong><\/span>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002<\/p>\n
\"\"<\/p>\n
\u300cid:3, name:”\u7acb\u5ddd\u88d5\u7f8e”\u300d\u306b\u95a2\u9023\u3059\u308b\uff08user_id:3\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\uff09\u3001\u4ee5\u4e0b\u306e3\u3064\u306ePost\u30c7\u30fc\u30bf\u3082\u524a\u9664\u3055\u308c\u3066\u3044\u308b<\/strong><\/span>\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n