{"id":2061,"date":"2013-02-14T11:05:30","date_gmt":"2013-02-14T02:05:30","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=2061"},"modified":"2018-11-14T16:33:56","modified_gmt":"2018-11-14T07:33:56","slug":"activesupport%e3%82%92%e8%aa%ad%e3%82%80-hashreverse_merge","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2013\/02\/14\/activesupport%e3%82%92%e8%aa%ad%e3%82%80-hashreverse_merge\/","title":{"rendered":"ActiveSupport\u3092\u8aad\u3080: Hash#reverse_merge"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n<p>ActiveSupport \u3067\u306f Ruby \u306e\u30b3\u30a2\u30af\u30e9\u30b9\u306b\u591a\u304f\u306e\u62e1\u5f35\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u4e2d\u306b\u3001\u300c<a href=\"https:\/\/github.com\/rails\/rails\/blob\/v3.2.12\/activesupport\/lib\/active_support\/core_ext\/hash\/reverse_merge.rb\">core_ext\/hash\/reverse_merge.rb<\/a>\u300d\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b Hash#reverse_merge \u304c\u3042\u308a\u307e\u3059\u3002\uff08\u7834\u58ca\u7684\u30d0\u30fc\u30b8\u30e7\u30f3\u306e Hash#reverse_merge! \u3082\u3042\u308a\u307e\u3059\u3002\uff09<\/p>\n<p>&nbsp;<\/p>\n<h2>Hash#reverse_merge<\/h2>\n<p>\u5b9f\u88c5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true\">class Hash\r\n  def reverse_merge(other_hash)\r\n    other_hash.merge(self)\r\n  end\r\nend<\/pre>\n<p>\u5b9f\u88c5\u306f\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true\">other_hash.merge(hash)<\/pre>\n<p>Hash#reverse_merge \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true\">hash.reverse_merge(other_hash)<\/pre>\n<p>&nbsp;<\/p>\n<h2>Q.\u4f55\u304c\u5b09\u3057\u3044\u306e\uff1f A.\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3067\u304d\u308b<\/h2>\n<p>\u4f8b\u3068\u3057\u3066\u3001\u4f1a\u54e1\u30b5\u30a4\u30c8\u3067\u30ed\u30b0\u30a4\u30f3\u3057\u305f\u3068\u304d\u306b\u300c\u3053\u3093\u306b\u3061\u306f\u3001\u25cb\u25cb\u3055\u3093\u300d\u306e\u3088\u3046\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u51fa\u308b\u3053\u3068\u304c\u826f\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u5b9f\u73fe\u3059\u308b\u30d8\u30eb\u30d1\u30fc\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true\"># \u30a6\u30a7\u30eb\u30ab\u30e0\u30e1\u30c3\u30bb\u30fc\u30b8 (Ex. '\u3053\u3093\u306b\u3061\u306f\u3001\u592a\u90ce\u3055\u3093') \u3092\u751f\u6210\u3059\u308b.\r\ndef welcome_message(message, options={})\r\n  # \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3068\u30de\u30fc\u30b8\u3059\u308b.\r\n  default_options = {name: '\u30b2\u30b9\u30c8'}\r\n  options = default_options.merge(options)\r\n\r\n  # \u8868\u793a\u7528\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u69cb\u7bc9\u3059\u308b.\r\n  \"#{message}\u3001#{options[:name]}\u3055\u3093\"\r\nend<\/pre>\n<p>Hash#reverse_merge \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true\"># \u30a6\u30a7\u30eb\u30ab\u30e0\u30e1\u30c3\u30bb\u30fc\u30b8 (Ex. '\u3053\u3093\u306b\u3061\u306f\u3001\u592a\u90ce\u3055\u3093') \u3092\u751f\u6210\u3059\u308b.\r\ndef welcome_message(message, options={})\r\n  # \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3068\u30de\u30fc\u30b8\u3059\u308b.\r\n  default_options = {name: '\u30b2\u30b9\u30c8'}\r\n  options = options.reverse_merge(default_options)\r\n\r\n  # \u8868\u793a\u7528\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u69cb\u7bc9\u3059\u308b.\r\n  \"#{message}\u3001#{options[:name]}\u3055\u3093\"\r\nend<\/pre>\n<p>\u4ee5\u4e0b\u306e\u884c\u304c\u3001<\/p>\n<pre class=\"lang:ruby decode:true\">options = default_options.merge(options)<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u5909\u308f\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"lang:ruby decode:true\">options = options.reverse_merge(default_options)<\/pre>\n<p>Hash#reverse_merge \u3092\u4f7f\u3046\u3068\u3001\u300coptions.reverse_merge(default_options)\u300d\u306e\u3088\u3046\u306b\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u3068\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>Ruby2.0\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u5f15\u6570\u304c\u53d6\u3063\u3066\u4ee3\u308f\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308b<\/h2>\n<p>\u4e0a\u8a18\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306a\u5f15\u6570\u3092\u30cf\u30c3\u30b7\u30e5\u3067\u53d7\u3051\u53d6\u308a\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092 reverse_merge \u3059\u308b\uff08options.reverse_merge(default_options) \u3059\u308b\uff09\u3068\u3044\u3046\u30d1\u30bf\u30fc\u30f3\u306f\u975e\u5e38\u306b\u591a\u3044\u3067\u3059\u304c\u3001\u4eca\u5f8c\u3053\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u306f Ruby2.0 \u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u5f15\u6570\u3067\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\uff08\u30ad\u30fc\u30ef\u30fc\u30c9\u5f15\u6570\u306b\u3064\u3044\u3066\u306f\u300c<a title=\"Ruby2.0\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u5f15\u6570\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306a\u5f15\u6570\u306b\u307e\u3064\u308f\u308b\u9762\u5012\u4e8b\u304b\u3089\u3055\u3088\u3046\u306a\u3089\" href=\"http:\/\/www.techscore.com\/blog\/2013\/02\/12\/ruby2-0%e3%81%ae%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e5%bc%95%e6%95%b0%e3%81%a7%e9%9d%a2%e5%80%92%e4%ba%8b%e3%81%8b%e3%82%89%e3%81%95%e3%82%88%e3%81%86%e3%81%aa%e3%82%89\/\">Ruby2.0\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u5f15\u6570\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306a\u5f15\u6570\u306b\u307e\u3064\u308f\u308b\u9762\u5012\u4e8b\u304b\u3089\u3055\u3088\u3046\u306a\u3089<\/a>\u300d\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002\uff09<\/p>\n<p>&nbsp;<\/p>\n<p>Hash#reverse_merge \u81ea\u4f53\u304c\u4e0d\u8981\u306b\u306a\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u300c\u7740\u76ee\u3057\u3066\u3044\u308b\u5909\u6570\u3092\u30ec\u30b7\u30fc\u30d0\u306b\u3067\u304d\u308b\u300d\u3068\u3044\u3046\u7279\u9577\u3092\u751f\u304b\u305b\u308b\u5834\u6240\u3067\u4f7f\u308f\u308c\u7d9a\u3051\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001\u9234\u6728\u3067\u3059\u3002<\/p>\n<p>ActiveSupport \u3067\u306f Ruby \u306e\u30b3\u30a2\u30af\u30e9\u30b9\u306b\u591a\u304f\u306e\u62e1\u5f35\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u4e2d\u306b\u3001\u300ccore_ext\/hash\/reverse_merge.rb\u300d\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b Hash#reverse_merge \u304c\u3042\u308a\u307e\u3059\u3002<br \/><a href=\"https:\/\/www.techscore.com\/blog\/2013\/02\/14\/activesupport%e3%82%92%e8%aa%ad%e3%82%80-hashreverse_merge\/\">\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\/2061"}],"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=2061"}],"version-history":[{"count":1,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/2061\/revisions"}],"predecessor-version":[{"id":17955,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/2061\/revisions\/17955"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=2061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=2061"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=2061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}