{"id":2158,"date":"2013-03-25T13:00:24","date_gmt":"2013-03-25T04:00:24","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=2158"},"modified":"2018-11-14T16:33:55","modified_gmt":"2018-11-14T07:33:55","slug":"activesupport%e3%82%92%e8%aa%ad%e3%82%80-activesupportconcern","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2013\/03\/25\/activesupport%e3%82%92%e8%aa%ad%e3%82%80-activesupportconcern\/","title":{"rendered":"ActiveSupport\u3092\u8aad\u3080: ActiveSupport::Concern"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n

\u5148\u65e5\u3001\u300cActiveSupport::Concern \u3067\u30cf\u30c3\u30d4\u30fc\u306a\u30e2\u30b8\u30e5\u30fc\u30eb\u30e9\u30a4\u30d5\u3092\u9001\u308b<\/a>\u300d\u3067 ActiveSupport::Concern \u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u304c\u3001\u304d\u3063\u3068\u88cf\u5074\u3067\u306f\u8272\u3005\u306a\u30c6\u30af\u30cb\u30c3\u30af\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n

\u3068\u3044\u3046\u3053\u3068\u3067 ActiveSupport::Concern \u304c\u88cf\u5074\u3067\u3069\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u884c\u306a\u3063\u3066\u3044\u308b\u306e\u304b\u3001ActiveSupport::Concern<\/a> \u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u307f\u307e\u3059\uff01<\/p>\n

 <\/p>\n

ActiveSupport::Concern \u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3080<\/h2>\n

\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306f\u3053\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n

module ActiveSupport\r\n  ...\r\n  module Concern\r\n    def self.extended(base)\r\n      base.instance_variable_set(\"@_dependencies\", [])\r\n    end\r\n\r\n    def append_features(base)\r\n      if base.instance_variable_defined?(\"@_dependencies\")\r\n        base.instance_variable_get(\"@_dependencies\") << self\r\n        return false\r\n      else\r\n        return false if base < self\r\n        @_dependencies.each { |dep| base.send(:include, dep) }\r\n        super\r\n        base.extend const_get(\"ClassMethods\") if const_defined?(\"ClassMethods\")\r\n        if const_defined?(\"InstanceMethods\")\r\n          base.send :include, const_get(\"InstanceMethods\")\r\n          ActiveSupport::Deprecation.warn \"The InstanceMethods module inside ActiveSupport::Concern will be \" \\\r\n            \"no longer included automatically. Please define instance methods directly in #{self} instead.\", caller\r\n        end\r\n        base.class_eval(&@_included_block) if instance_variable_defined?(\"@_included_block\")\r\n      end\r\n    end\r\n\r\n    def included(base = nil, &block)\r\n      if base.nil?\r\n        @_included_block = block\r\n      else\r\n        super\r\n      end\r\n    end\r\n  end\r\n\r\n  ...\r\nend<\/pre>\n
extended, append_features, included \u3068\u3044\u3046 3 \u3064\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
 <\/p>\n
extended<\/h2>\n
\u6700\u521d\u306b extended \u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
    def self.extended(base)\r\n      base.instance_variable_set(\"@_dependencies\", [])\r\n    end<\/pre>\n
extended \u306f\u30e2\u30b8\u30e5\u30fc\u30eb\u304c extend \u3055\u308c\u305f\u6642\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u3053\u3053\u3067\u306fbase \u306b\u5bfe\u3057\u3066\u5909\u6570 @_dependencies \u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5909\u6570\u540d\u304b\u3089\u60f3\u50cf\u3059\u308b\u3068\u3001\u4f9d\u5b58\u95a2\u4fc2\u306b\u95a2\u3059\u308b\u4f55\u304b\u304c @_dependencies \u306b\u4fdd\u6301\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u3002<\/p>\n
 <\/p>\n
included<\/h2>\n
\u6b21\u306b included \u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
    def included(base = nil, &block)\r\n      if base.nil?\r\n        @_included_block = block\r\n      else\r\n        super\r\n      end\r\n    end<\/pre>\n
base \u304c nil \u304b\u3069\u3046\u304b\u3067\u5206\u5c90\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
base \u304c nil \u306b\u306a\u308b\u306e\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3055\u308c\u305f\u5834\u5408\u3067\u3059\u3002<\/p>\n
module Example\r\n  extend ActiveSupport::Concern\r\n  included do\r\n    ...\r\n  end\r\nend<\/pre>\n
\u3053\u306e\u6642\u306f\u30d6\u30ed\u30c3\u30af\u3092 @_included_block \u306b\u4fdd\u5b58\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
base \u304c nil \u4ee5\u5916\u306b\u306a\u308b\u306e\u306f\u3001\u3069\u306e\u3088\u3046\u306a\u5834\u5408\u3067\u3057\u3087\u3046\u304b\u3002\u305d\u308c\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b ActiveSupport::Concern \u3067 extend \u3057\u305f\u30e2\u30b8\u30e5\u30fc\u30eb\u304c include \u3055\u308c\u305f\u5834\u5408\u3067\u3059\u3002<\/p>\n
module OtherModule\r\n  include Example\r\nend<\/pre>\n
\u3053\u306e\u3068\u304d\u306f\u7279\u5225\u306a\u51e6\u7406\u306f\u884c\u308f\u305a\u3001\u5358\u7d14\u306b\u5143\u306e\u51e6\u7406\uff08super\uff09\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
 <\/p>\n
append_features<\/h2>\n
\u6700\u5f8c\u306f append_features \u3067\u3059\u3002<\/p>\n
    def append_features(base)\r\n      if base.instance_variable_defined?(\"@_dependencies\")\r\n        base.instance_variable_get(\"@_dependencies\") << self\r\n        return false\r\n      else\r\n        return false if base < self\r\n        @_dependencies.each { |dep| base.send(:include, dep) }\r\n        super\r\n        base.extend const_get(\"ClassMethods\") if const_defined?(\"ClassMethods\")\r\n        if const_defined?(\"InstanceMethods\")\r\n          base.send :include, const_get(\"InstanceMethods\")\r\n          ActiveSupport::Deprecation.warn \"The InstanceMethods module inside ActiveSupport::Concern will be \" \\\r\n            \"no longer included automatically. Please define instance methods directly in #{self} instead.\", caller\r\n        end\r\n        base.class_eval(&@_included_block) if instance_variable_defined?(\"@_included_block\")\r\n      end\r\n    end<\/pre>\n
append_features \u306f\u3042\u307e\u308a\u898b\u6163\u308c\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001ActiveSupport \u304c\u5b9a\u7fa9\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u306a\u304f\u3001Ruby \u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\uff08see Module#append_features<\/a>\uff09\u3002<\/p>\n
\u82e5\u5e72\u30dc\u30ea\u30e5\u30fc\u30e0\u306e\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001@_dependencies \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3067\u6761\u4ef6\u5206\u5c90\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
\u3069\u3061\u3089\u306b\u5206\u5c90\u3059\u308b\u306e\u304b<\/h3>\n
\u4f8b\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
module M1\r\n  extend ActiveSupport::Concern\r\nend\r\n\r\nmodule M2\r\n  extend ActiveSupport::Concern\r\n  include M1 # (1)\r\nend\r\n\r\nmodule M3\r\n  extend ActiveSupport::Concern\r\n  include M2 # (2)\r\nend\r\n\r\nclass C\r\n  include M3 # (3)\r\nend<\/pre>\n
include \u3057\u3066\u3044\u308b\u5834\u6240\u306f 3 \u7b87\u6240\u3001\u30b3\u30e1\u30f3\u30c8\u3067 (1), (2), (3) \u3068\u66f8\u3044\u3066\u3044\u308b\u3068\u3053\u308d\u3067\u3059\u304c\u3001(1) \u3068 (2) \u306b\u3064\u3044\u3066\u306f M1 \u3068 M2 \u306f ActiveSupport::Concern \u3067 extend \u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001@_dependencies \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306e\u5206\u5c90\u306b\u5165\u308a\u307e\u3059\u3002<\/p>\n
(3) \u306b\u3064\u3044\u3066\u306f\u3001C \u306f ActiveSupport::Concern \u3067 extend \u3057\u3066\u3044\u307e\u305b\u3093\u306e\u3067\u3001@_dependencies \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306e\u5206\u5c90\u306b\u5165\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u308c\u3067\u306f\u3001\u6761\u4ef6\u5206\u5c90\u306e\u305d\u308c\u305e\u308c\u306e\u51e6\u7406\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
@_dependencies \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u5834\u5408<\/h3>\n
\u3053\u306e\u6642\u306f @_dependencies \u306b self \u3092\u8ffd\u52a0\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u51e6\u7406\uff08super\uff09\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u3053\u306e\u6642\u70b9\u3067 base \u306b\u30e1\u30bd\u30c3\u30c9\u306f\u8ffd\u52a0\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u203bappend_features \u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u52d5\u4f5c\u306f\u300c\u30af\u30e9\u30b9\u3084\u30e2\u30b8\u30e5\u30fc\u30eb\uff08base\uff09\u306b self \u306e\u6a5f\u80fd\u3092\u8ffd\u52a0\u3059\u308b\u300d\u3067\u3042\u308a\u3001\u305d\u308c\u3092\u884c\u308f\u305a\u306b return \u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
@_dependencies \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408<\/h3>\n
\u6700\u521d\u306b\u300cbase < self\u300d\u3067\u3042\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        return false if base < self<\/pre>\n
\u300cbase < self\u300d\u306f base \u306e\u7d99\u627f\u968e\u5c64\u306e\u4e0a\u4f4d\u306b self \u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306b true \u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u30e2\u30b8\u30e5\u30fc\u30eb\u304c\u8907\u6570\u56de include \u3055\u308c\u305f\u5834\u5408\u3092\u8003\u616e\u3057\u305f\u3082\u306e\u3067\u3042\u308a\u30012 \u56de\u76ee\u4ee5\u964d\u306f\u4f55\u3082\u884c\u308f\u306a\u3044\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u3067\u3059\u3002<\/p>\n
\u6b21\u306e\u884c\u3092\u898b\u308b\u3068\u3001@_dependencies \u306b\u84c4\u3048\u3089\u308c\u3066\u3044\u308b\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u9806\u756a\u306b base \u306b include \u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        @_dependencies.each { |dep| base.send(:include, dep) }<\/pre>\n
@_dependencies \u306b\u4fdd\u6301\u3057\u3066\u3044\u305f\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u9806\u756a\u306b base \u306b include \u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u3044\u3048\u3070\u3001M1 \u3092 M2 \u304c include \u3057\u3066\u3001M2 \u3092 M3 \u304c include \u3057\u3066\u3001M3 \u3092 C \u304c include \u3057\u3066\u3044\u307e\u3059\u304c\u3001\u4e0a\u8a18\u306e\u51e6\u7406\u3067 C \u306b\u5bfe\u3057\u3066 M1, M2 \u304c include \u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u6ce8\u610f\u3067\u3059\u304c\u3001\u3053\u306e\u6642\u70b9\u3067 M3 \u306f C \u306b include \u3055\u308c\u307e\u305b\u3093\u3002\u3068\u3044\u3046\u306e\u3082\u3001@_dependencies \u306b M3 \u306f\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n
module M1\r\n  extend ActiveSupport::Concern\r\nend\r\n\r\nmodule M2\r\n  extend ActiveSupport::Concern\r\n  include M1 # (1)\r\nend\r\n\r\nmodule M3\r\n  extend ActiveSupport::Concern\r\n  include M2 # (2)\r\nend\r\n\r\nclass C\r\n  include M3 # (3)\r\nend<\/pre>\n
\u6b21\u306e\u884c\u3067\u306f super \u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u3084\u3063\u3068\u3001M3 \u304c C \u306b include \u3055\u308c\u307e\u3059\uff08\u203b\u6b63\u78ba\u306b\u306f\u300cM3 \u306e\u6a5f\u80fd\u304c C \u306b\u8ffd\u52a0\u300d\u3055\u308c\u307e\u3059\u3002include \u3059\u308b\u3068 append_features \u304c\u547c\u3073\u51fa\u3055\u308c\u3001append_features \u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u51e6\u7406\u306f\u300cbase \u306b self \u306e\u6a5f\u80fd\u3092\u8ffd\u52a0\u300d\u3055\u308c\u308b\u306e\u3067\u3002\u3084\u3084\u3053\u3057\u3044\u30fb\u30fb\uff09\u3002<\/p>\n
        super<\/pre>\n
\u6b21\u306f ClassMethods \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u305d\u308c\u3067 base \u3092 extend \uff08\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306b\u8ffd\u52a0\uff09\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        base.extend const_get(\"ClassMethods\") if const_defined?(\"ClassMethods\")<\/pre>\n
\u305d\u306e\u6b21\u306f InstanceMethods \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u305d\u308c\u3092 base \u306b include \u3057\u307e\u3059\u3002\uff08\u203bInstanceMethods \u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u306f\u975e\u63a8\u5968\u3068\u306a\u3063\u305f\u305f\u3081\u3001\u8b66\u544a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u65b0\u3057\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5834\u5408\u306f\u3001\u666e\u901a\u306b\u30e2\u30b8\u30e5\u30fc\u30eb\u5185\u306b\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u3057\u307e\u3059\uff09\u3002<\/p>\n
        if const_defined?(\"InstanceMethods\")\r\n          base.send :include, const_get(\"InstanceMethods\")\r\n          ActiveSupport::Deprecation.warn \"The InstanceMethods module inside ActiveSupport::Concern will be \" \\\r\n            \"no longer included automatically. Please define instance methods directly in #{self} instead.\", caller\r\n        end<\/pre>\n
\u6700\u5f8c\u306f included \u3067\u6307\u5b9a\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u3092 base \u306e class_eval \u306b\u6e21\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
        base.class_eval(&@_included_block) if instance_variable_defined?(\"@_included_block\")<\/pre>\n
 <\/p>\n
\u307e\u3068\u3081<\/h2>\n
ActiveSupport::Concern \u304c\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u306e\u304b\u898b\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
append_features \u3092\u4f7f\u3063\u3066\u3044\u308b\u30b3\u30fc\u30c9\u3092\u898b\u308b\u306e\u306f\u521d\u3081\u3066\u3067\u3057\u305f\u3057\u3001\u8aad\u307f\u89e3\u304f\u306e\u306f\u5927\u5909\u3067\u3057\u305f\u304c\u3001\u5f97\u308b\u3082\u306e\u306f\u5927\u304d\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n
 <\/p>\n
Happy Programming!<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n
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