{"id":2126,"date":"2013-02-18T08:41:59","date_gmt":"2013-02-17T23:41:59","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=2126"},"modified":"2018-11-14T16:33:56","modified_gmt":"2018-11-14T07:33:56","slug":"activesupport%e3%82%92%e8%aa%ad%e3%82%80-object-in","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2013\/02\/18\/activesupport%e3%82%92%e8%aa%ad%e3%82%80-object-in\/","title":{"rendered":"ActiveSupport\u3092\u8aad\u3080: Object#in? \u3067\u542b\u3093\u3067\u308b?"},"content":{"rendered":"

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

\u524d\u56de\u8aad\u3093\u3060 Hash#reverse_merge \u306f\u3001\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3067\u304d\u308b\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3057\u305f\u3002<\/p>\n

core_ext\/object\/inclusion.rb<\/a> \u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b Object#in? \u3082\u540c\u69d8\u306b\u3001\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n

\u305d\u306e\u3046\u3061\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u306b\u300c\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3059\u308b\u300d\u304c\u52a0\u308f\u308b\u65e5\u304c\u6765\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306d\uff08\uff3e\uff3e\uff1b<\/p>\n

 <\/p>\n

Object#in?<\/h2>\n

\u307e\u305a\u306f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

def in?(*args)\r\n  if args.length > 1\r\n    args.include? self\r\n  else\r\n    another_object = args.first\r\n    if another_object.respond_to? :include?\r\n      another_object.include? self\r\n    else\r\n      raise ArgumentError.new 'The single parameter passed to #in? must respond to #include?'\r\n    end\r\n  end\r\nend<\/pre>\n
\u5358\u7d14\u306a\u5b9f\u88c5\u304b\u3068\u601d\u3044\u304d\u3084\u3001\u3044\u304f\u3064\u304b\u6761\u4ef6\u5206\u5c90\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5f15\u6570\u304c\u8907\u6570\u306e\u5834\u5408<\/h3>\n
\u4e00\u756a\u7c21\u5358\u306a\u90e8\u5206\u306f\u3001\u6700\u521d\u306e\u300cif args.length > 1\u300d\u304c true \u3068\u306a\u3063\u305f\u5834\u5408\u306e\u51e6\u7406\u3067\u3059\u306d\u3002<\/p>\n
if args.length > 1\r\n  args.include? self\r\nelse\r\n  ...<\/pre>\n
Object#in? \u306f\u53ef\u5909\u9577\u5f15\u6570\u3092\u53d6\u308a\u307e\u3059\u304c\u3001\u8907\u6570\u306e\u5f15\u6570\u304c\u6e21\u3055\u308c\u305f\u5834\u5408\u306b\u3053\u3053\u3092\u901a\u308a\u307e\u3059\u3002<\/p>\n
\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u547c\u3073\u51fa\u3057\u306b\u5bfe\u3057\u3066\u3001\u300cargs.include? self\u300d\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n
1.in?(1, 2, 3)<\/pre>\n
\u5f15\u6570\u304c 1 \u3064\u306e\u5834\u5408<\/h3>\n
\u305d\u308c\u3067\u306f\u6700\u521d\u306e\u6761\u4ef6\u5206\u5c90\u300cif args.length > 1\u300d\u304c false \u3068\u306a\u3063\u305f\u5834\u5408\u3001\u3064\u307e\u308a\u5f15\u6570\u304c 1 \u3064\uff08\u4ee5\u4e0b\uff09\u306e\u5834\u5408\u306b\u5b9f\u884c\u3055\u308c\u308b\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
another_object = args.first\r\nif another_object.respond_to? :include?\r\n  another_object.include? self\r\nelse\r\n  raise ArgumentError.new 'The single parameter passed to #in? must respond to #include?'\r\nend<\/pre>\n
\u3053\u306e\u6761\u4ef6\u5206\u5c90\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u547c\u3073\u51fa\u3057\u304c\u884c\u308f\u308c\u305f\u6642\u306b\u901a\u308a\u307e\u3059\u3002<\/p>\n
1.in?([1, 2, 3])<\/pre>\n
\u300canother_object = args.first\u300d\u3067\u306f args \u306e\u5148\u982d\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u300c1.in?([1, 2, 3])\u300d\u3068\u3044\u3046\u547c\u3073\u51fa\u3057\u304c\u884c\u308f\u308c\u308b\u3068\u3001args \u306f\u300c[[1, 2, 3,]]\u300d\u3068\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u305d\u3053\u304b\u3089\u300c[1, 2, 3]\u300d\u3092\u53d6\u5f97\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n
\u305d\u306e\u5f8c\u306e\u51e6\u7406\u306f\u3001\u53d6\u308a\u51fa\u3057\u305f another_object \u304c include? \u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u304b\u3069\u3046\u304b\u3067\u5206\u5c90\u3057\u307e\u3059\u3002<\/p>\n
\u300cif another_object.respond_to? :include?\u300d\u306e\u90e8\u5206\u304c\u5224\u5b9a\u90e8\u5206\u3067\u3059\uff08respond_to? \u306f\u30ec\u30b7\u30fc\u30d0\u304c\u6307\u5b9a\u3055\u308c\u305f\u540d\u524d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\uff09\u3002<\/p>\n
another_object \u304c include? \u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u5834\u5408\u306f\u300canother_object.include? self\u300d\u304c\u5b9f\u884c\u3055\u308c\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070 ArgumentError \u304c raise \u3055\u308c\u307e\u3059\u3002<\/p>\n
 <\/p>\n
Hash \u306b\u5bfe\u3059\u308b in? \u306f\u30ad\u30fc\u306b\u542b\u307e\u308c\u308b\u304b\u5224\u5b9a\u3059\u308b<\/h2>\n
Object#in? \u306e\u5f15\u6570\u306b\u30cf\u30c3\u30b7\u30e5\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306e\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
hash = {1 => :one, 2 => :two, 3 => :three}\r\np 1.in?(hash)    # => true\r\np :one.in?(hash) # => false<\/pre>\n
\u3053\u306e\u3088\u3046\u306b\u3001Object#in? \u306e\u5f15\u6570\u306b Hash \u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306f\u3001Hash \u306e\u30ad\u30fc\u306b\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u5224\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u3001\u300c1.in?(hash)\u300d\u3068\u3059\u308b\u3068\u300chash.include?(1)\u300d\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u304c\u3001Hash#include? \u306f\u30ad\u30fc\u306b\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u300cHash\u306e\u5024\u306b\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u300d\u3067\u306f\u306a\u3044\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
Hash \u306e\u5024\u306b\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u5224\u5b9a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u308b<\/h3>\n
Hash \u306e\u300c\u30ad\u30fc\u300d\u3067\u306f\u306a\u304f\u300c\u5024\u300d\u306b\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u5224\u5b9a\u3057\u305f\u3044\u5834\u5408\u306f\u3069\u3046\u3057\u307e\u3057\u3087\u3046\u304b\u3002<\/p>\n
Hash#value? \u30e1\u30bd\u30c3\u30c9\u3067\u5b9f\u73fe\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u3001Object#in? \u306e\u3088\u3046\u306b\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3057\u305f\u3044\u3067\u3059\u3002<\/p>\n
Object#in? \u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3060\u4eca\u306a\u3089\u3001\u305d\u308c\u3092\u5b9f\u73fe\u3059\u308b\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u306f\u7c21\u5358\u306a\u306f\u305a\u3067\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
class Object\r\n  def in_values?(hash)\r\n    hash.value?(self)\r\n  end\r\nend\r\n\r\nhash = {1 => :one, 2 => :two, 3 => :three}\r\np 1.in_values?(hash)    # => false\r\np :one.in_values?(hash) # => true<\/pre>\n
Ruby2.0 \u306e Refinements \u3092\u4f7f\u3063\u3066\u307f\u308b<\/h3>\n
\u3053\u3053\u3067\u6211\u306b\u8fd4\u308b\u3068\u3001\u76ee\u5148\u306e\u4fbf\u5229\u3055\u3068\u5f15\u304d\u63db\u3048\u306b Object \u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n
Object \u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u3053\u3068\u81ea\u4f53\u306f\u6c7a\u3057\u3066\u60aa\u3044\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u306b\u5f71\u97ff\u3059\u308b\u62e1\u5f35\u3067\u3042\u308b\u3053\u3068\u3092\u5fd8\u308c\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002<\/p>\n
\u65e2\u5b58\u30af\u30e9\u30b9\u306e\u62e1\u5f35\u306f\u3001\u62e1\u5f35\u3059\u308b\u3053\u3068\u306e\u5f71\u97ff\u3068\u3001\u3082\u305f\u3089\u3055\u308c\u308b\u30e1\u30ea\u30c3\u30c8\u3068\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3067\u3059\u3002\u30d0\u30e9\u30f3\u30b9\u611f\u899a\u304c\u5927\u5207\u3067\u3059\u3002<\/p>\n
\u4fbf\u5229\u306a\u62e1\u5f35\u3092\u3057\u305f\u3044\u304c\u3001\u5f71\u97ff\u306f\u9650\u5b9a\u7684\u306b\u3057\u305f\u3044\uff01 \u3068\u3044\u3046\u5834\u5408\u306b\u601d\u3044\u3064\u304f\u306e\u306f\u3001Ruby2.0 \u306e Refinements \uff08\u5b9f\u9a13\u7684\u6a5f\u80fd\uff09\u3067\u3059\u3002<\/p>\n
Refinements \u3092\u4f7f\u3046\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
module HashInValuePredicate\r\n  refine Object do\r\n    def in_values?(hash)\r\n      hash.has_value?(self)\r\n    end\r\n  end\r\nend\r\n\r\nusing HashInValuePredicate\r\n\r\nhash = {1 => :one, 2 => :two, 3 => :three}\r\np 1.in_values?(hash)    # => false\r\np :one.in_values?(hash) # => true<\/pre>\n
 <\/p>\n
\u307e\u3068\u3081<\/h2>\n
ActiveSupport \u304c\u63d0\u4f9b\u3059\u308b Object#in? \u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u3068\u3044\u3046\u8da3\u65e8\u3067\u66f8\u304d\u59cb\u3081\u305f\u306e\u3067\u3059\u304c\u3001\u5c11\u3057\u767a\u6563\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u30fb\u30fb\uff08\uff3e\uff3e\uff1b<\/p>\n
\u66f8\u3044\u3066\u3044\u308b\u3046\u3061\u306b\u300c\u30b3\u30a2\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u3068\u304d\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u300d\u3092\u8003\u3048\u59cb\u3081\u3066\u3057\u307e\u3044\u3001\u305d\u3046\u3044\u3048\u3070 Ruby2.0 \u304b\u3089\u306f Refinements \u304c\u5b9f\u9a13\u7684\u6a5f\u80fd\u3068\u3057\u3066\u767b\u5834\u3059\u308b\u306a\u3001\u306a\u3068\u3069\u8272\u3005\u8003\u3048\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n
\u3068\u3053\u308d\u3067\u3001\u5c11\u3057\u6614\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306e ActiveSupport \u3067\u306f\u300crequire 'active_support'\u300d\u3068\u66f8\u304f\u3068\u3001\u5168\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u8aad\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n
\u305d\u308c\u304c\u3001\u6700\u8fd1\u3067\u306f\u300crequire 'active_support\/core_ext\/object\/inclusion'\u300d\u306e\u3088\u3046\u306b\u500b\u5225\u306b\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u307e\u308b\u3054\u3068\u8aad\u307f\u8fbc\u3080\u5834\u5408\u306f\u300crequire 'active_support\/all'\u300d\u3067\u3059\u3002<\/p>\n
\u3053\u308c\u304c ActiveSupport \u306e\u30d0\u30e9\u30f3\u30b9\u611f\u899a\u306a\u3093\u3067\u3057\u3087\u3046\u306d\u3002<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n
\u524d\u56de\u8aad\u3093\u3060 Hash#reverse_merge \u306f\u3001\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3067\u304d\u308b\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3057\u305f\u3002
\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[89,18,84],"tags":[68,24],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/2126"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=2126"}],"version-history":[{"count":1,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/2126\/revisions"}],"predecessor-version":[{"id":17953,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/2126\/revisions\/17953"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=2126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=2126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=2126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}