{"id":26522,"date":"2021-08-01T08:08:09","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=26522"},"modified":"2024-05-06T11:43:44","modified_gmt":"2024-05-06T02:43:44","slug":"%e3%80%90rails%e5%85%a5%e9%96%80%e3%80%91joins%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/26522","title":{"rendered":"\u3010Rails\u5165\u9580\u3011joins\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081"},"content":{"rendered":"

\n\u3053\u3093\u306b\u3061\u306f! \u30d5\u30ea\u30fc\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9577\u702c\u3067\u3059\u3002<\/p>\n

\u307f\u306a\u3055\u3093\u3001joins<\/strong><\/span>\u306f\u4f7f\u3063\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n

joins\u3092\u4f7f\u3048\u3070\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u5185\u90e8\u7d50\u5408\u304c\u7c21\u5358\u3067\u304d\u307e\u3059\u3002 <\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001joins\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066<\/p>\n

\u30fbjoins\u306e\u57fa\u672c<\/strong><\/span><\/p>\n

\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n

\u30fbjoins\u306e\u3055\u307e\u3056\u307e\u306a\u4f7f\u3044\u65b9<\/strong><\/span><\/p>\n

\u3068\u3044\u3063\u305f\u5fdc\u7528\u7684\u306a\u5185\u5bb9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

joins\u306e\u57fa\u672c<\/h2>\n

joins\u3068\u306f<\/h3>\n

joins<\/strong><\/span>\u306f\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u5185\u90e8\u7d50\u5408\u3057\u3066\u691c\u7d22\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3067\u3059\u3002<\/p>\n

\u5185\u90e8\u7d50\u5408\u3068\u306f\u3001\u5404\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3067\u95a2\u9023\u3065\u3051\u3089\u308c\u305fid\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u3082\u306e\u3060\u3051\u3092\u4f7f\u3063\u3066\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n

\u306a\u306e\u3067\u3001id\u304c\u4e00\u81f4\u3057\u306a\u3044\u3082\u306e<\/strong><\/span>\u306f\u5207\u308a\u6368\u3066\u3089\u308c\u307e\u3059\u3002<\/p>\n

\u30c6\u30fc\u30d6\u30eb\u304c\u3044\u304f\u3064\u304b\u306b\u5206\u3051\u3089\u308c\u3066\u3044\u308b\u5834\u5408\u30011\u30641\u3064\u304b\u3089\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092\u898b\u3064\u3051\u308b\u3088\u308a\u3082\u3001\u30c6\u30fc\u30d6\u30eb\u30921\u3064\u306b\u307e\u3068\u3081\u3066\u304b\u3089\u898b\u3064\u3051\u308b\u307b\u3046\u304c\u697d\u3067\u3059\u3088\u306d\uff1f<\/p>\n

\u306a\u306e\u3067\u3001\u7d50\u5408\u3057\u3066\u304b\u3089\u691c\u7d22\u3059\u308b\u3053\u3068\u3092\u53ef\u80fd\u306b\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n

\u7d50\u5408\u306e\u7a2e\u985e\u306b\u306f\u5185\u90e8\u7d50\u5408\u306e\u307b\u304b\u306b\u3001\u5de6\u5916\u90e8\u7d50\u5408<\/strong><\/span>\u3068\u53f3\u5916\u90e8\u7d50\u5408<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5185\u90e8\u7d50\u5408\u304c\u4e00\u81f4\u3057\u305f\u3082\u306e\u3060\u3051\u3067\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001\u5916\u90e8\u7d50\u5408\u3067\u306f\u512a\u5148\u30c6\u30fc\u30d6\u30eb\u3092\u9078\u629e\u3057\u3066<\/strong><\/span>\u7d50\u5408\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u306a\u306e\u3067\u3001\u512a\u5148\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u306f\u5207\u308a\u6368\u3066\u3089\u308c\u307e\u305b\u3093\u3002
\n\u512a\u5148\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u306b\u3057\u304b\u306a\u3044\u30c7\u30fc\u30bf\u306b\u5bfe\u5fdc\u3059\u308b\u90e8\u5206\u306fNULL\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u305f\u3068\u3068\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a2\u3064\u306eCastle\u30c6\u30fc\u30d6\u30eb\u3068Owner\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n

Castle\u30c6\u30fc\u30d6\u30eb
\n\"castletable\"<\/p>\n

Owner\u30c6\u30fc\u30d6\u30eb
\n\"Ownertable\"<\/p>\n

\u3053\u308c\u3092\u5185\u90e8\u7d50\u5408\u3059\u308b\u3068\u3001
\n\"innerJointable\"<\/p>\n

\u3053\u306e\u3088\u3046\u306b\u3001owener_id\u304c\u4e00\u81f4\u3059\u308b\u3082\u306e\u3060\u3051<\/strong><\/span>\u304c\u3001\u8868\u793a\u3055\u308c\u307e\u3059\u3002
\nonwer_id\u304c\u4e00\u81f4\u3057\u306a\u304b\u3063\u305f\u9996\u91cc\u57ce\u306f\u5207\u308a\u6368\u3066\u3089\u308c\u307e\u3057\u305f\u3002<\/p>\n

Castle\u30c6\u30fc\u30d6\u30eb\u3092\u512a\u5148\u3057\u3066\u5916\u90e8\u7d50\u5408\u3059\u308b\u3068<\/p>\n

\"Screen<\/p>\n

\u3053\u306e\u3088\u3046\u306b\u512a\u5148\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u306f\u3059\u3079\u3066\u8868\u793a\u3055\u308c\u3001\u5bfe\u5fdc\u3059\u308b\u90e8\u5206\u304c\u306a\u3044\u5834\u5408\u306b\u306fNULL<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002(\u3053\u306e\u5834\u5408owner_id 4\u306b\u306f\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u304c\u306a\u3044)<\/p>\n

joins\u3068includes\u306e\u9055\u3044<\/h3>\n

joins\u3068includes<\/strong><\/span>\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3053\u3061\u3089\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002
\n \n

\n
\n
\n \n <\/div>\n
\n
\u3010Rails\u5165\u9580\u3011\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u60aa\u3044\u306a\u3089includes\/order\u3092\u691c\u8a0e\u3057\u3088\u3046<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n <\/p>\n

joins\u306e\u3055\u307e\u3056\u307e\u306a\u4f7f\u3044\u65b9<\/h2>\n

\u7d50\u5408\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5<\/h3>\n

\u307e\u305a\u306f\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
\n\u3053\u3061\u3089\u306e\u30b3\u30fc\u30c9\u3092\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\u306b\u5165\u529b\u3057\u3066\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

rails g model User name:string\r\nrails g model Post user_id:integer title:string month:integer\r\nrake db:migrate<\/pre>\n
\u3053\u308c\u3067name\u306e\u30ab\u30e9\u30e0\u3092\u6301\u3064User\u30c6\u30fc\u30d6\u30eb\u3068user_id\u3001title\u3001month\u30ab\u30e9\u30e0\u3092\u6301\u3064Post\u30c7\u30fc\u30d6\u30eb\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u6b21\u306b\u5b9f\u969b\u306b\u30c7\u30fc\u30bf\u3092\u5165\u308c\u3066\u3044\u304d\u307e\u3059\u3002
\nrails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30da\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
User.create(name:"\u5c71\u7530\u82b1\u5b50")\r\nUser.create(name:"\u9577\u702c\u6765")\r\nUser.create(name:"\u5b89\u7530\u4e00\u90ce")\r\nUser.create(name:"\u7d30\u7530\u4fca\u4ecb")\r\nUser.create(name:"\u5b89\u539f\u5e84\u4e4b\u52a9")\r\nUser.create(name:"\u4e2d\u6751\u62d3\u90ce")\r\nPost.create(user_id:1,title:"\u697d\u3057\u3044\u4f11\u65e5\u306e\u904e\u3054\u3057\u65b9" ,month:8)\r\nPost.create(user_id:1,title:"\u5148\u65e5\u306e\u65c5\u884c\u3067\u306e\u8a71" ,month:2)\r\nPost.create(user_id:2,title:"\u6628\u65e5\u306e\u51fa\u6765\u4e8b" ,month:12)\r\nPost.create(user_id:3,title:"\u5c71\u767b\u308a\u306b\u884c\u304d\u307e\u3057\u305f" ,month:8)\r\nPost.create(user_id:5,title:"\u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f" ,month:4)\r\nPost.create(user_id:8,title:"\u6700\u8fd1\u5c11\u3057\u6c17\u306b\u306a\u3063\u305f\u3053\u3068" ,month:1)\r\nPost.create(user_id:13,title:"\u30e9\u30f3\u30cb\u30f3\u30b0\u306e\u30b3\u30c4" ,month:9)<\/pre>\n
\u5404\u30c6\u30fc\u30d6\u30eb\u306b\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u304c\u5165\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u6b21\u306bUser\u3001Post\u30c6\u30fc\u30d6\u30eb\u3092\u95a2\u9023\u4ed8\u3051\u307e\u3059\u3002
\nmodels\/user.rb\u306b<\/p>\n
has_many :posts<\/pre>\n
models\/post.rb\u306b<\/p>\n
belongs_to :user<\/pre>\n
\u3092\u305d\u308c\u305e\u308c\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3053\u308c\u3067\u3001\u6e96\u5099\u304c\u6574\u3044\u307e\u3057\u305f\u3002<\/p>\n
\u5b9f\u969b\u306bjoins\u3092\u4f7f\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u3068\u305d\u306e\u524d\u306b\u3053\u3053\u304b\u3089\u306frails cosole\u306b\u53d6\u308a\u51fa\u3057\u305f\u30c7\u30fc\u30bf\u3092\u51fa\u529b\u3057\u3066\u3044\u304f\u306e\u3067
\n\u51fa\u529b\u3057\u305f\u30c7\u30fc\u30bf\u306e\u898b\u6804\u3048\u3092\u826f\u304f<\/strong><\/span>\u306b\u3059\u308b\u305f\u3081\u306b\u4e00\u3064gem\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002
\n(\u3059\u3067\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u6e08\u307f\u306e\u65b9\u306f\u98db\u3070\u3057\u3066\u3082\u3089\u3063\u3066\u304b\u307e\u3044\u307e\u305b\u3093\u3002)<\/p>\n
\u307e\u305a\u3001Gemfile\u306b<\/p>\n
gem 'hirb'         # \u51fa\u529b\u7d50\u679c\u3092\u8868\u3068\u3057\u3066\u51fa\u529b\u3059\u308bgem\r\ngem 'hirb-unicode'  # \u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u306e\u8868\u793a\u3092\u88dc\u6b63\u3059\u308bgem<\/pre>\n
\u3092\u8ffd\u8a18\u3057\u3066\u3001
\n\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\u3067<\/p>\n
bundle install<\/pre>\n
\u3092\u5165\u529b\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u305d\u3057\u3066\u6700\u5f8c\u306brails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u958b\u3044\u305f\u5f8c\u3001<\/p>\n
Hirb.enable<\/pre>\n
\u3068\u5165\u529b\u3057\u3066\u3001hirb\u306egem\u3092\u6709\u52b9\u306b\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u3067\u51fa\u529b\u306e\u6e96\u5099\u306f\u5b8c\u4e86\u3067\u3059\u3002<\/p>\n
\u305d\u308c\u3067\u306fjoins\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\nrails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[joins\u3092\u4f7f\u3063\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
User.joins(:posts)<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
 User Load (0.5ms)  SELECT "users".* FROM "users" INNER JOIN "posts" ON "posts"."user_id" = "users"."id"\r\n+----+------------+---------------------------+---------------------------+\r\n| id | name       | created_at                | updated_at                |\r\n+----+------------+---------------------------+---------------------------+\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 2  | \u9577\u702c\u6765     | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 5  | \u5b89\u539f\u5e84\u4e4b\u52a9 | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n+----+------------+---------------------------+---------------------------+\r\n5 rows in set<\/pre>\n
\u3053\u306e\u3088\u3046\u306b\u3001id\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u30ab\u30e9\u30e0<\/strong><\/span>\u3060\u3051\u304c\u53d6\u308a\u51fa\u3055\u308c\u3066\u3001\u305d\u306e\u307b\u304b\u306f\u5207\u308a\u6368\u3066\u3089\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001Post.create(user_id:8,title:"\u6700\u8fd1\u5c11\u3057\u6c17\u306b\u306a\u3063\u305f\u3053\u3068" ,month:1)\u306e\u30b3\u30de\u30f3\u30c9\u3067\u5165\u529b\u3057\u305f\u30c7\u30fc\u30bf\u306eid\u306f8\u3067\u3059\u304c\u3001\u305d\u308c\u306b\u5bfe\u5fdc\u3059\u308bid\u304cUser\u30c6\u30fc\u30d6\u30eb\u306b\u306f\u306a\u3044\u306e\u3067\u3001\u5185\u90e8\u7d50\u5408\u3067\u306f\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002<\/strong><\/span><\/p>\n
\u307e\u305f\u3001joins\u3067select<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u7279\u5b9a\u306e\u30ab\u30e9\u30e0\u3092\u9078\u629e\u3057\u3066\u8868\u793a\u3067\u304d\u307e\u3059\u3002<\/p>\n
rails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[joins+select\u3092\u4f7f\u3063\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
User.joins(:posts).select("users.name")<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
 User Load (0.2ms)  SELECT users.name FROM "users" INNER JOIN "posts" ON "posts"."user_id" = "users"."id"\r\n+----+------------+\r\n| id | name       |\r\n+----+------------+\r\n|    | \u5c71\u7530\u82b1\u5b50   |\r\n|    | \u5c71\u7530\u82b1\u5b50   |\r\n|    | \u9577\u702c\u6765     |\r\n|    | \u5b89\u7530\u4e00\u90ce   |\r\n|    | \u5b89\u539f\u5e84\u4e4b\u52a9 |\r\n+----+\u2014\u2014\u2014\u2014\u2014\u2014+<\/pre>\n
select(\u30ab\u30e9\u30e0\u540d.\u30c6\u30fc\u30d6\u30eb\u540d)\u3067\u3001\u7279\u5b9a\u306e\u30ab\u30e9\u30e0\u3060\u3051\u3092\u9078\u3093\u3067\u8868\u793a\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u691c\u7d22\u6761\u4ef6\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5<\/h3>\n
joins\u3068where\u53e5<\/strong><\/span>\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u5185\u90e8\u7d50\u5408\u3057\u305f\u5f8c\u306b\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u30c7\u30fc\u30bf\u53d6\u308a\u51fa\u305b\u307e\u3059\u3002<\/p>\n
rails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[joins+where\u53e5\u3092\u4f7f\u3063\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
User.joins(:posts).where(posts: { month: 8 })<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
User Load (0.2ms)  SELECT "users".* FROM "users" INNER JOIN "posts" ON "posts"."user_id" = "users"."id" WHERE "posts"."month" = ?  [["month", 8]]\r\n+----+----------+---------------------------+---------------------------+\r\n| id | name     | created_at                | updated_at                |\r\n+----+----------+---------------------------+---------------------------+\r\n| 1  | \u5c71\u7530\u82b1\u5b50 | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n+----+----------+---------------------------+---------------------------+\r\n2 rows in set<\/pre>\n
Post.create(user_id:1,title:"\u697d\u3057\u3044\u4f11\u65e5\u306e\u904e\u3054\u3057\u65b9" ,month:8)
\nPost.create(user_id:3,title:"\u5c71\u767b\u308a\u306b\u884c\u304d\u307e\u3057\u305f" ,month:8)<\/p>\n
\u3067\u8ffd\u52a0\u3057\u305f\u30c7\u30fc\u30bf\u306emonth\u306f\u4e21\u65b9\u3068\u30828\u306a\u306e\u3067\u3001\u3053\u306e2\u3064\u304c\u53d6\u308a\u51fa\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u3001where\u53e5\u3092\u4f7f\u3046\u3053\u3068\u306b\u3088\u3063\u3066\u6761\u4ef6\u3092\u6307\u5b9a<\/strong><\/span>\u3067\u304d\u307e\u3059\u3002<\/p>\n
joins\u306b\u3066\u5916\u90e8\u7d50\u5408\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5<\/h2>\n
rails4\u4ee5\u524d\u306e\u65b9\u6cd5<\/h3>\n
joins\u306f\u5185\u90e8\u7d50\u5408\u3067\u3042\u308b\u3068\u8aac\u660e\u3057\u307e\u3057\u305f\u304c\u3001\u5b9f\u306f\u66f8\u304d\u65b9\u306b\u3088\u3063\u3066\u306f\u5de6\u5916\u90e8\u7d50\u5408<\/strong><\/span>\u306b\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
rails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[joins\u3067\u5de6\u5916\u90e8\u7d50\u5408\u3092\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
User.joins("LEFT OUTER JOIN posts ON users.id = posts.user_id")<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
User.joins("LEFT OUTER JOIN posts ON users.id = posts.user_id")\r\nUser Load (2.1ms)  SELECT "users".* FROM "users" LEFT OUTER JOIN posts ON users.id = posts.user_id\r\n+----+------------+---------------------------+---------------------------+\r\n| id | name       | created_at                | updated_at                |\r\n+----+------------+---------------------------+---------------------------+\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 2  | \u9577\u702c\u6765     | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 4  | \u7d30\u7530\u4fca\u4ecb   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 5  | \u5b89\u539f\u5e84\u4e4b\u52a9 | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 6  | \u4e2d\u6751\u62d3\u90ce   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n+----+------------+---------------------------+---------------------------+\r\n7 rows in set<\/pre>\n
LEFT OUTER JOIN<\/strong><\/span>\u306e\u90e8\u5206\u3067\u5de6\u5916\u90e8\u7d50\u5408\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u512a\u5148\u30c6\u30fc\u30d6\u30eb\u306fUser\u306a\u306e\u3067\u3001User\u30c6\u30fc\u30d6\u30eb\u306e\u30ab\u30e9\u30e0\u304c\u512a\u5148\u3057\u3066<\/strong><\/span>\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
rail5\u306b\u3066\u8ffd\u52a0\u3055\u308c\u305f\u65b0\u305f\u306a\u65b9\u6cd5<\/h3>\n
\u307e\u305frails5\u304b\u3089\u306fleft_outer_joins\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u3066\u76f4\u63a5SQL\u6587\u3092\u66f8\u304b\u306a\u304f\u3066\u3082\u5de6\u5916\u90e8\u7d50\u5408\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
rails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[\u751f\u306eSQL\u6587\u3092\u4f7f\u308f\u305a\u306bjoins\u3067\u5de6\u5916\u90e8\u7d50\u5408\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
User.left_outer_joins(:posts)<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
User Load (0.3ms)  SELECT "users".* FROM "users" LEFT OUTER JOIN "posts" ON "posts"."user_id" = "users"."id"\r\n+----+------------+---------------------------+---------------------------+\r\n| id | name       | created_at                | updated_at                |\r\n+----+------------+---------------------------+---------------------------+\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 2  | \u9577\u702c\u6765     | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 4  | \u7d30\u7530\u4fca\u4ecb   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 5  | \u5b89\u539f\u5e84\u4e4b\u52a9 | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n| 6  | \u4e2d\u6751\u62d3\u90ce   | 2017-07-04 12:03:54 +0900 | 2017-07-04 12:03:54 +0900 |\r\n+----+------------+---------------------------+---------------------------+<\/pre>\n
User.joins("LEFT OUTER JOIN posts ON users.id = posts.user_id\u201d)\u3092\u7528\u3044\u305f\u6642\u3068\u540c\u3058\u7d50\u679c\u306b\u306a\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u306a\u306e\u3067\u3001Rails5\u4ee5\u964d\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3053\u3061\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001joins\u306e\u4f7f\u3044\u65b9\u3092\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n
joins\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u5185\u90e8\u7d50\u5408<\/strong><\/span>\u3057\u3066\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u305b\u307e\u3059\u3002<\/p>\n
\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u969b\u306b\u306f\u3001joins\u306e\u4ed6\u306bpreload,eager_load,includes\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u305e\u308c\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u6027\u3092\u7406\u89e3<\/strong><\/span>\u3057\u305f\u3046\u3048\u3067\u3001\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u3082\u3057joins\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3053\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f! \u30d5\u30ea\u30fc\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9577\u702c\u3067\u3059\u3002 \u307f\u306a\u3055\u3093\u3001joins\u306f\u4f7f\u3063\u3066\u3044\u307e\u3059\u304b\uff1f joins\u3092\u4f7f\u3048\u3070\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u5185\u90e8\u7d50\u5408\u304c\u7c21\u5358\u3067\u304d\u307e\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001joins\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066 \u30fbjoins\u306e\u57fa\u672c \u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9 […]<\/p>\n","protected":false},"author":4,"featured_media":26524,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2352],"tags":[498,14],"class_list":["post-26522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ruby-study","tag-joins","tag-ruby-on-rails"],"acf":[],"yoast_head":"\n\u3010Rails\u5165\u9580\u3011joins\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Rails\u5165\u9580\u3011joins\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sejuku.net\/blog\/26522\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Rails\u5165\u9580\u3011joins\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Rails\u5165\u9580\u3011joins\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sejuku.net\/blog\/26522\" \/>\n<meta property=\"og:site_name\" content=\"\u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/sejuku2013\" \/>\n<meta property=\"article:author\" 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