{"id":26994,"date":"2021-08-01T08:08:09","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=26994"},"modified":"2024-05-06T11:43:52","modified_gmt":"2024-05-06T02:43:52","slug":"%e3%80%90rails%e5%85%a5%e9%96%80%e3%80%91scope%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\/26994","title":{"rendered":"\u3010Rails\u5165\u9580\u3011scope\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081"},"content":{"rendered":"

\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\u306fscope\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u304b\u3002<\/p>\n

scope<\/strong><\/span>\u3092\u4f7f\u3048\u3070\u3001SQL\u6587\u3092\u30e1\u30bd\u30c3\u30c9\u5316<\/strong><\/span>\u3067\u304d\u308b\u306e\u3067\u30c7\u30fc\u30bf\u7ba1\u7406\u3092\u52b9\u7387\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001scope\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066<\/p>\n

\u30fbscope \u3068\u306f<\/strong><\/span>
\n\u30fbscope\u306e\u4f7f\u3044\u65b9<\/strong><\/span><\/p>\n

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

\u30fbscope\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9<\/strong><\/span><\/p>\n

\u3068\u3044\u3063\u305f\u4e00\u6b69\u9032\u3093\u3060\u5185\u5bb9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

scope\u3068\u306f<\/h2>\n

\u30e2\u30c7\u30eb\u306bscope\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u7279\u5b9a\u306eSQL\u6587\u3092\u30e1\u30bd\u30c3\u30c9\u5316<\/strong><\/span>\u3057\u3066\u4f7f\u3048\u307e\u3059\u3002<\/p>\n

\u306a\u306e\u3067\u3001\u7e70\u308a\u8fd4\u3057\u3088\u304f\u4f7f\u3046SQL\u6587\u304c\u3042\u308b\u3068\u304d\u306b\u306fscope\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u4eca\u56de\u306fUser\u30e2\u30c7\u30eb\u3068Post\u30e2\u30c7\u30eb\u3092\u4f7f\u3063\u3066\u89e3\u8aac\u3059\u308b\u306e\u3067\u3001\u307e\u305a\u306f\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

[User\u30e2\u30c7\u30eb\u3068Post\u30e2\u30c7\u30eb\u3092\u4f5c\u6210\u3057\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u53cd\u6620\u3059\u308b]<\/strong><\/span><\/p>\n

rails g model User name:string age:integer\r\nrails g model Post user:references title:string deleted_at:datetime\r\nrake db:migrate<\/pre>\n
\u3053\u308c\u3067\u3001\u4eca\u56de\u4f7f\u3046\u30ab\u30e9\u30e0\u3068\u30e2\u30c7\u30eb\u304c\u4f5c\u6210\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u7d9a\u3044\u3066\u30c7\u30fc\u30bf\u3092\u5165\u308c\u3066\u3044\u304d\u307e\u3057\u3087\u3046\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
[User\u30e2\u30c7\u30eb\u3068Post\u30e2\u30c7\u30eb\u306b\u4eca\u56de\u4f7f\u3046\u30c7\u30fc\u30bf\u3092\u5165\u308c\u308b<\/strong><\/span><\/p>\n
User.create(name:"\u5c71\u7530\u82b1\u5b50",age:3)\r\nUser.create(name:"\u9577\u702c\u6765",age:27)\r\nUser.create(name:"\u5b89\u7530\u4e00\u90ce",age:11)\r\nUser.create(name:"\u7d30\u7530\u4fca\u4ecb",age:34)\r\nUser.create(name:"\u5b89\u539f\u5e84\u4e4b\u52a9",age:88)\r\nUser.create(name:"\u4e2d\u6751\u62d3\u90ce",age:81)\r\nPost.create(user_id:3,title:"\u697d\u3057\u3044\u4f11\u65e5\u306e\u904e\u3054\u3057\u65b9",deleted_at:"2017-05-01 09:37:00".to_datetime,created_at:"2017-04-26 15:29:00".to_datetime)\r\nPost.create(user_id:2,title:"\u5148\u65e5\u306e\u65c5\u884c\u3067\u306e\u8a71",created_at:"2017-04-30 23:04:00".to_datetime ,deleted_at:"2017-05-16 9:38:00".to_datetime)\r\nPost.create(user_id:1,title:"\u6628\u65e5\u306e\u51fa\u6765\u4e8b" ,created_at: "2017-05-24 13:02:00".to_datetime)\r\nPost.create(user_id:6,title:"\u5c71\u767b\u308a\u306b\u884c\u304d\u307e\u3057\u305f",created_at:"2017-05-27 12:37:00".to_datetime )\r\nPost.create(user_id:4,title:"\u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f",created_at: "2017-05-29 14:40:00".to_datetime)\r\nPost.create(user_id:5,title:"\u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f",created_at: "2017-06-8 13:00:00".to_datetime)\r\nPost.create(user_id:4,title:"\u6700\u8fd1\u5c11\u3057\u6c17\u306b\u306a\u3063\u305f\u3053\u3068",created_at:"2017-05-16 9:38:00".to_datetime)\r\nPost.create(user_id:2,title:"\u30e9\u30f3\u30cb\u30f3\u30b0\u306e\u30b3\u30c4",created_at: "2017-05-2 9:18:00".to_datetime)<\/pre>\n
\u3053\u308c\u3067\u30c7\u30fc\u30bf\u304c\u5165\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u7d9a\u3044\u3066\u3001User\u3068Post\u306e\u95a2\u9023\u4ed8\u3051\u3092\u884c\u3044\u307e\u3059\u306e\u3067\u3001\u305d\u308c\u305e\u308c\u306emodel\u306b\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[app\/models\/user.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
has_many :posts<\/pre>\n
[app\/models\/post.rb\u306b\u8a18\u8ff0\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
belongs_to :user<\/pre>\n
\u3053\u308c\u3067\u95a2\u9023\u4ed8\u3051\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3057\u305f\u3002 <\/p>\n
\u3067\u306f\u5b9f\u969b\u306bscope<\/strong><\/span>\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
app\/models\/user.rb\u306b\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[app\/models\/user.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
scope :young, -> { where("age < 20") }<\/pre>\n
\u3053\u306e\u3088\u3046\u306byoung\u3068\u3044\u3046scope\u3092\u8a2d\u5b9a\u3057\u305f\u306e\u3067\u3001young\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u3048\u308b<\/strong><\/span>\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u304b\u3089\u306frails cosole\u306b\u53d6\u308a\u51fa\u3057\u305f\u30c7\u30fc\u30bf\u3092\u51fa\u529b\u3057\u3066\u3044\u304f\u306e\u3067\u3001\u51fa\u529b\u3057\u305f\u30c7\u30fc\u30bf\u306e\u898b\u6804\u3048\u3092\u826f\u304f\u306b\u3059\u308b<\/strong><\/span>\u305f\u3081\u306b\u4e00\u3064gem\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002(\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
\n[Gemfile\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/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\u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\u3067<\/p>\n
[Gemfile\u306e\u5185\u5bb9\u3092\u53cd\u6620\u3059\u308b]<\/strong><\/span><\/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
\u3053\u308c\u3067\u3001\u3044\u3064\u3067\u3082Hirb.enable\u3068\u30b3\u30fc\u30bd\u30fc\u30eb\u3067\u5165\u529b\u3059\u308c\u3070Hirb\u306egem\u304c\u6709\u52b9\u306b\u306a\u308a\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
[\u81ea\u5206\u3067\u8a2d\u5b9a\u3057\u305fyoung\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u307f\u308b]<\/strong><\/span><\/p>\n
Hirb.enable #\u8868\u5f62\u5f0f\u3067\u51fa\u529b\r\nUser.young<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
 User Load (3.9ms)  SELECT "users".* FROM "users" WHERE (age < 20)\r\n+----+----------+-----+---------------------------+---------------------------+\r\n| id | name     | age | created_at                | updated_at                |\r\n+----+----------+-----+---------------------------+---------------------------+\r\n| 1  | \u5c71\u7530\u82b1\u5b50 | 3   | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce | 11  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n+----+----------+-----+---------------------------+---------------------------+\r\n2 rows in set<\/pre>\n
\u30e2\u30c7\u30eb\u3067\u8a2d\u5b9a\u3057\u305fage\u304c20\u4ee5\u4e0b\u306e\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059young\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306bscope\u3092\u5b9a\u7fa9\u3059\u308c\u3070\u3001\u3088\u304f\u4f7f\u3046SQL\u6587\u3092\u30e1\u30bd\u30c3\u30c9\u5316<\/strong><\/span>\u3057\u3066\u4f7f\u3048\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u304cscope\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\u3067\u3059\u3002<\/p>\n
scope\u306e\u57fa\u672c\u69cb\u6587<\/h3>\n
\u305d\u308c\u3067\u306f\u3001\u3055\u304d\u307b\u3069\u4f7f\u3063\u305fscope\u306e\u69cb\u6587\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
[scope\u3067\u5b9a\u7fa9\u3055\u308c\u305fyoung\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b]<\/strong><\/span><\/p>\n
scope :young, -> { where("age < 20") }<\/pre>\n
scope\u306fmodels\u4ee5\u4e0b\u306e\u30e2\u30c7\u30eb\u540d.rb\u30d5\u30a1\u30a4\u30eb\u5185\u306b\u8a18\u8ff0\u306b\u3057\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u3001scope :(\u30e1\u30bd\u30c3\u30c9\u306e\u540d\u524d)\u3067\u30e1\u30bd\u30c3\u30c9\u540d\u3092\u5b9a\u7fa9\u3057\u3066\u305d\u308c\u4ee5\u964d\u306e\u90e8\u5206\u306bSQL\u6587\u3092\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u306e\u69cb\u6587\u306f\u30e9\u30e0\u30c0\u5f0f<\/strong><\/span>\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u30e9\u30e0\u30c0(lambda)\u5f0f\u3068\u306f<\/h3>\n
\u30e9\u30e0\u30c0\u5f0f<\/strong><\/span>\u3068\u306f\u540d\u524d\u306e\u901a\u308a\u3001\u30e9\u30e0\u30c0\u3092\u4f7f\u3063\u305f\u5f0f\u306e\u3053\u3068\u3067\u3001Rails4\u4ee5\u964d\u306fscope\u306e\u5b9a\u7fa9\u306b\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u3053\u3068\u304c\u5fc5\u9808\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/strong><\/span><\/p>\n
\u30e9\u30e0\u30c0\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u3068\u30011\u3064\u306e\u8a18\u4e8b\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
\u3067\u3059\u306e\u3067\u3001\u3053\u3053\u3067\u306f\u30e9\u30e0\u30c0\u5f0f\u306f\u3044\u304f\u3064\u304b\u306e\u30b3\u30fc\u30c9\u3092\u307e\u3068\u3081\u30661\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u6271\u3046<\/strong><\/span>\u3053\u3068\u3092\u5b9f\u73fe\u3057\u3066\u304f\u308c\u308b\u4fbf\u5229\u306a\u3082\u306e\u3068\u3044\u3046\u8a8d\u8b58\u3067\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n
Ruby\u306b\u306f\u30e9\u30e0\u30c0(lamda)\u306e\u4ed6\u306bProc\u3068\u3044\u3046\u985e\u4f3c\u306e\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002
\n\u6c17\u306b\u306a\u308b\u65b9\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002
\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010Ruby\u5165\u9580\u3011Proc\u3068Lambda\u306e\u9055\u3044\u307e\u3068\u3081\u3010\u5f15\u6570 return \u30a2\u30ed\u30fc\u3011<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n             <\/p>\n
\u3055\u304d\u307b\u3069\u3001\u4f7f\u3063\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4f8b\u306b\u3059\u308b\u3068<\/p>\n
scope :young, -> { where("age < 20") }<\/pre>\n
scope\u4ee5\u964d\u306e:young, -> \u301c\u304c\u30e9\u30e0\u30c0\u5f0f\u3067\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\u90e8\u5206\u3067\u3059\u3002<\/p>\n
scope\u306e\u4f7f\u3044\u65b9<\/h2>\n
scope\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n
\u305d\u308c\u3067\u306fscope\u3092\u5b9f\u8df5\u7684\u306b\u4f7f\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u307e\u305a\u306fwhere<\/strong><\/span>\u3092\u4f7f\u3063\u305fscope\u304b\u3089\u3067\u3059\u3002<\/p>\n
app\/models\/post.rb\u306b\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[app\/models\/post.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
scope :two_months, -> { where("created_at < ?",Time.zone.now-2.month) }<\/pre>\n
where\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3057\u305fscope\u3092\u4f7f\u3063\u3066\u3044\u304d\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
[two_months\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059]<\/strong><\/span><\/p>\n
Hirb.enable #\u8868\u5f62\u5f0f\u3067\u51fa\u529b\r\nPost.two_months<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
Post Load (0.2ms)  SELECT "posts".* FROM "posts" WHERE (created_at < '2017-05-10 10:10:25.297859')\r\n+----+---------+----------------------+---------------------------+---------------------------+---------------------------+\r\n| id | user_id | title                | deleted_at                | created_at                | updated_at                |\r\n+----+---------+----------------------+---------------------------+---------------------------+---------------------------+\r\n| 1  | 3       | \u697d\u3057\u3044\u4f11\u65e5\u306e\u904e\u3054\u3057\u65b9 | 2017-05-01 18:37:00 +0900 | 2017-04-27 00:29:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 2  | 2       | \u5148\u65e5\u306e\u65c5\u884c\u3067\u306e\u8a71     | 2017-05-16 18:38:00 +0900 | 2017-05-01 08:04:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 8  | 2       | \u30e9\u30f3\u30cb\u30f3\u30b0\u306e\u30b3\u30c4     |                           | 2017-05-02 18:18:00 +0900 | 2017-07-10 01:43:32 +0900 |\r\n+----+---------+----------------------+---------------------------+---------------------------+---------------------------+\r\n3 rows in set<\/pre>\n
\u3053\u306e\u3088\u3046\u306b\u3001where\u304c\u9069\u5fdc\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u7d9a\u3044\u3066\u3001order<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
app\/models\/post.rb\u306b\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[app\/models\/post.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
scope :desc, -> { order("posts.created_at DESC") }<\/pre>\n
order\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3057\u305fscope\u3092\u4f7f\u3063\u3066\u3044\u304d\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
[desc\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059]<\/strong><\/span><\/p>\n
Hirb.enable #\u8868\u5f62\u5f0f\u3067\u51fa\u529b\r\nPost.desc<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
 Post Load (2.2ms)  SELECT "posts".* FROM "posts" ORDER BY posts.created_at DESC\r\n+----+---------+------------------------+---------------------------+---------------------------+---------------------------+\r\n| id | user_id | title                  | deleted_at                | created_at                | updated_at                |\r\n+----+---------+------------------------+---------------------------+---------------------------+---------------------------+\r\n| 6  | 5       | \u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f     |                           | 2017-06-08 22:00:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 5  | 4       | \u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f     |                           | 2017-05-29 23:40:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 4  | 6       | \u5c71\u767b\u308a\u306b\u884c\u304d\u307e\u3057\u305f     |                           | 2017-05-27 21:37:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 3  | 1       | \u6628\u65e5\u306e\u51fa\u6765\u4e8b           |                           | 2017-05-24 22:02:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 7  | 4       | \u6700\u8fd1\u5c11\u3057\u6c17\u306b\u306a\u3063\u305f\u3053\u3068 |                           | 2017-05-16 18:38:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 8  | 2       | \u30e9\u30f3\u30cb\u30f3\u30b0\u306e\u30b3\u30c4       |                           | 2017-05-02 18:18:00 +0900 | 2017-07-10 01:43:32 +0900 |\r\n| 2  | 2       | \u5148\u65e5\u306e\u65c5\u884c\u3067\u306e\u8a71       | 2017-05-16 18:38:00 +0900 | 2017-05-01 08:04:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 1  | 3       | \u697d\u3057\u3044\u4f11\u65e5\u306e\u904e\u3054\u3057\u65b9   | 2017-05-01 18:37:00 +0900 | 2017-04-27 00:29:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n+----+---------+------------------------+---------------------------+---------------------------+---------------------------+\r\n8 rows in set<\/pre>\n
order\u3067\u6307\u5b9a\u3057\u305fcreated_at\u306e\u964d\u9806\u3067\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u305b\u307e\u3057\u305f\u3002<\/strong><\/span><\/p>\n
\u30d1\u30e9\u30e1\u30fc\u30bf\u4ed8\u304d\u306escope\u306e\u4f7f\u3044\u65b9<\/h3>\n
\u307e\u305f\u3001scope\u306b\u306f\u30d1\u30e9\u30e1\u30fc\u30bf<\/strong><\/span>\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3064\u307e\u308a\u3001\u30e9\u30e0\u30c0\u5f0f\u306b\u5f15\u6570\u3092\u4ed8\u3051\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092app\/models\/user.rb\u306b\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002
\n[app\/models\/user.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
scope :age_check, ->(number) { where("age < ?", number) }<\/pre>\n
\u3053\u308c\u3067scope\u304c\u8a2d\u5b9a\u3067\u304d\u305f\u306e\u3067\u3001rails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u958b\u3044\u3066\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[\u8a2d\u5b9a\u3057\u305fage\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u307f\u308b]<\/strong><\/span><\/p>\n
Hirb.enable #\u8868\u5f62\u5f0f\u3067\u51fa\u529b\r\nUser.age_check(50)<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
User Load (0.4ms)  SELECT "users".* FROM "users" WHERE (age < 50)\r\n+----+----------+-----+---------------------------+---------------------------+\r\n| id | name     | age | created_at                | updated_at                |\r\n+----+----------+-----+---------------------------+---------------------------+\r\n| 1  | \u5c71\u7530\u82b1\u5b50 | 3   | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 2  | \u9577\u702c\u6765   | 27  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce | 11  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 4  | \u7d30\u7530\u4fca\u4ecb | 34  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n+----+----------+-----+---------------------------+---------------------------+\r\n4 rows in set<\/pre>\n
50\u3092\u5f15\u304d\u6570\u3068\u3057\u3066\u6e21\u3057\u305f\u306e\u3067\u3001age\u304c50\u3088\u308a\u3082\u5c0f\u3055\u3044user\u304c\u53d6\u308a\u51fa\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u306b\u4f7f\u3048\u308b\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002<\/p>\n
default_scope\u306e\u4f7f\u3044\u65b9<\/h3>\n
default_scope<\/strong><\/span>\u3092\u4f7f\u3048\u3070\u3001\u30e2\u30c7\u30eb\u306b\u8a2d\u5b9a\u3057\u305fscope\u3092\u53cd\u6620\u3057\u305f\u7d50\u679c\u3092\u5e38\u306b\u51fa\u529b\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3066\u3059\u304c\u3001defall_scope\u306f\u5e38\u306b\u547c\u3070\u308c\u308b\u3088\u3046\u306b\u306a\u308b<\/strong><\/span>\u306e\u3067\u3001\u4f7f\u7528\u4e0a\u306e\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u8a18\u4e8b\u3067\u306fPost\u3067\u524a\u9664\u3055\u308c\u305f\u8a18\u4e8b\u3092\u8868\u793a\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
[app\/modes\/post.rb\u306bdefault_scope\u3092\u8a2d\u5b9a]<\/strong><\/span><\/p>\n
default_scope { where(deleted_at:nil) } <\/pre>\n
\u3053\u308c\u3067\u3001deleted_at\u306b\u65e5\u4ed8\u304c\u5165\u529b\u3055\u308c\u3066\u3044\u308b\u30ec\u30b3\u30fc\u30c9\u306f\u8868\u793a\u3055\u308c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u5b9f\u969b\u306b\u3059\u3079\u3066\u306ePost\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\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
[Post\u306e\u4e2d\u8eab\u3092\u5168\u3066\u8868\u793a\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
Hirb.enable #\u8868\u5f62\u5f0f\u3067\u51fa\u529b\r\nPost.all<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
Post Load (0.4ms)  SELECT "posts".* FROM "posts" WHERE "posts"."deleted_at" IS NULL\r\n+----+---------+------------------------+------------+---------------------------+---------------------------+\r\n| id | user_id | title                  | deleted_at | created_at                | updated_at                |\r\n+----+---------+------------------------+------------+---------------------------+---------------------------+\r\n| 3  | 1       | \u6628\u65e5\u306e\u51fa\u6765\u4e8b           |            | 2017-05-24 22:02:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 4  | 6       | \u5c71\u767b\u308a\u306b\u884c\u304d\u307e\u3057\u305f     |            | 2017-05-27 21:37:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 5  | 4       | \u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f     |            | 2017-05-29 23:40:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 6  | 5       | \u53cb\u4eba\u304c\u7d50\u5a5a\u3057\u307e\u3057\u305f     |            | 2017-06-08 22:00:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 7  | 4       | \u6700\u8fd1\u5c11\u3057\u6c17\u306b\u306a\u3063\u305f\u3053\u3068 |            | 2017-05-16 18:38:00 +0900 | 2017-07-10 01:43:31 +0900 |\r\n| 8  | 2       | \u30e9\u30f3\u30cb\u30f3\u30b0\u306e\u30b3\u30c4       |            | 2017-05-02 18:18:00 +0900 | 2017-07-10 01:43:32 +0900 |\r\n+----+---------+------------------------+------------+---------------------------+---------------------------+\r\n6 rows in set<\/pre>\n
\u3053\u306e\u3088\u3046\u306b\u3001\u3059\u3079\u3066\u53d6\u5f97\u3057\u3088\u3046\u3068\u3057\u3066\u3082default_scope\u306e\u52b9\u679c<\/strong><\/span>\u3067delete_at\u306b\u65e5\u4ed8\u304c\u3042\u308b\u8a18\u4e8b\u306f\u8868\u793a\u3055\u308c\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u305f\u3060default_scope\u306f\u6bce\u56de\u547c\u3070\u308c\u308b\u306e\u3067\u3001\u3088\u304f\u30d0\u30b0\u306e\u539f\u56e0<\/strong><\/span>\u306b\u306a\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n
\u306a\u306e\u3067\u3001\u4eca\u56de\u306e\u3088\u3046\u306b\u8ad6\u7406\u524a\u9664\u3059\u308b\u5834\u5408\u306a\u3069\u3001\u4f7f\u3044\u6240\u3092\u9650\u5b9a<\/strong><\/span>\u3057\u3066\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n
scope\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9<\/h2>\n
\u305d\u308c\u3067\u306f\u5c11\u3057\u5fdc\u7528\u306e\u52b9\u3044\u305fscope\u306e\u4f7f\u3044\u65b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
\u95a2\u9023\u4ed8\u3051\u3089\u308c\u305f2\u3064\u306e\u30c7\u30fc\u30d6\u30eb\u3092joins<\/strong><\/span>\u3067\u5185\u90e8\u7d50\u5408\u3059\u308b\u3068\u304d\u306b\u3001scope\u3067\u306fmerge<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5225\u306e\u30e2\u30c7\u30eb\u3067\u8a2d\u5b9a\u3057\u305fscope\u3092\u53c2\u7167\u3057\u3066\u4f7f\u3048\u307e\u3059\u3002<\/p>\n
\u4eca\u56de\u306forder\u306e\u8aac\u660e\u3067Post\u30e2\u30c7\u30eb\u306b\u8a2d\u5b9a\u3057\u305fdesc\u30e1\u30bd\u30c3\u30c9\u3092User\u30e2\u30c7\u30eb\u3067\u4f7f\u3048\u308b\u3088\u3046\u306b<\/strong><\/span>\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092app\/models\/user.rb\u306b\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002
\n[app\/models\/user.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
  has_many :posts\r\n  scope :desc_posts, -> { joins(:posts).merge(Post.desc) }<\/pre>\n
\u6b21\u306bapp\/models\/post.rb\u306b\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
[app\/models\/post.rb\u306b\u5165\u529b\u3059\u308b\u5185\u5bb9]<\/strong><\/span><\/p>\n
  belongs_to :user\r\n  scope :desc, -> { order("posts.created_at DESC") }<\/pre>\n
\u305d\u308c\u3067\u306f\u3001rails console\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u8d77\u52d5\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066User\u30e2\u30c7\u30eb\u3067\u8a2d\u5b9a\u3057\u305fscope\u3092\u4f7f\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
[desc_posts\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9]<\/strong><\/span><\/p>\n
Hirb.enable #\u8868\u5f62\u5f0f\u3067\u51fa\u529b\r\nUser.desc_posts<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/strong><\/span><\/p>\n
SELECT "users".* FROM "users" INNER JOIN "posts" ON "posts"."user_id" = "users"."id" ORDER BY posts.created_at DESC\r\n+----+------------+-----+---------------------------+---------------------------+\r\n| id | name       | age | created_at                | updated_at                |\r\n+----+------------+-----+---------------------------+---------------------------+\r\n| 5  | \u5b89\u539f\u5e84\u4e4b\u52a9 | 88  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 4  | \u7d30\u7530\u4fca\u4ecb   | 34  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 6  | \u4e2d\u6751\u62d3\u90ce   | 81  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 1  | \u5c71\u7530\u82b1\u5b50   | 3   | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 4  | \u7d30\u7530\u4fca\u4ecb   | 34  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 2  | \u9577\u702c\u6765     | 27  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 2  | \u9577\u702c\u6765     | 27  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n| 3  | \u5b89\u7530\u4e00\u90ce   | 11  | 2017-07-10 00:36:51 +0900 | 2017-07-10 00:36:51 +0900 |\r\n+----+------------+-----+---------------------------+---------------------------+\r\n8 rows in set<\/pre>\n
Post\u306ecreated_at\u30ab\u30e9\u30e0\u306e\u65e5\u4ed8\u306e\u964d\u9806\u3067\u5185\u90e8\u7d50\u5408\u3057\u3001\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u305b\u307e\u3057\u305f\u3002<\/p>\n
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