{"id":9428,"date":"2015-12-22T09:00:23","date_gmt":"2015-12-22T00:00:23","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=9428"},"modified":"2018-11-14T16:33:46","modified_gmt":"2018-11-14T07:33:46","slug":"ruby2-3%e3%82%92%e8%a7%a6%e3%81%a3%e3%81%a6%e3%81%bf%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2015\/12\/22\/ruby2-3%e3%82%92%e8%a7%a6%e3%81%a3%e3%81%a6%e3%81%bf%e3%82%8b\/","title":{"rendered":"Ruby2.3\u3092\u89e6\u3063\u3066\u307f\u308b"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u306e\u6751\u4e0a\u3067\u3059\u3002<br \/>\n<a href=\"\/blog\/2015\/11\/30\/techscore-advent-calendar-2015\/\">TECHSCORE Advent Calendar 2015<\/a> \u306e22\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u4eca\u6708\u306b\u3044\u3088\u3044\u3088Ruby2.3\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3059\u3002\u305f\u3076\u3093\u3002\u3002\u3002\u304a\u305d\u3089\u304f\u3002\u3002\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u5148\u65e5(12\/11)\u306bRuby 2.3.0-preview2 \u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3057\u305f\u3002<br \/>\n\u306a\u3093\u3067\u3001Ruby 2.3.0-preview2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3055\u3063\u305d\u304f\u89e6\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h2>\n<p>\u307e\u305a\u306f\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3067\u3059\u304c\u3001rvm\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3093\u3067\u305d\u308c\u3067\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>rvm\u3092\u6700\u65b0\u306b\u3057\u3066\u4e00\u89a7\u3092\u898b\u3066\u307f\u308b\u3068<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\nrvm get head\r\nrvm list knwon\r\n<\/pre>\n<pre class=\"lang:sh decode:true \">\r\n[ruby-]1.8.6[-p420]\r\n[ruby-]1.8.7[-head] # security released on head\r\n[ruby-]1.9.1[-p431]\r\n[ruby-]1.9.2[-p330]\r\n[ruby-]1.9.3[-p551]\r\n[ruby-]2.0.0[-p643]\r\n[ruby-]2.1.4\r\n[ruby-]2.1[.5]\r\n[ruby-]2.2[.1]\r\n[ruby-]2.2-head\r\nruby-head\r\n<\/pre>\n<p>\u307e\u3060\u3053\u3053\u306b\u306f\u51fa\u3066\u306a\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u76f4\u63a5\u30b5\u30fc\u30d0\u30fc(http:\/\/ftp.ruby-lang.org\/pub\/ruby\/2.3\/)\u3092\u898b\u3066\u307f\u308b\u3068\u5b58\u5728\u3059\u308b\u306e\u3067\u3001<br \/>\n\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306f\u3067\u304d\u305d\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\nrvm install ruby-2.3.0-preview2\r\n<\/pre>\n<p>\u3059\u308b\u3068<\/p>\n<pre class=\"lang:sh decode:true \">\r\nrvm list\r\n\r\nrvm rubies\r\n\r\n   ruby-1.9.3-p545 [ x86_64 ]\r\n   ruby-2.0.0-p598 [ x86_64 ]\r\n   ruby-2.1.1 [ x86_64 ]\r\n   ruby-2.1.2 [ x86_64 ]\r\n   ruby-2.1.3 [ x86_64 ]\r\n   ruby-2.1.5 [ x86_64 ]\r\n   ruby-2.2.0 [ x86_64 ]\r\n * ruby-2.2.1 [ x86_64 ]\r\n=> ruby-2.3.0-preview2 [ x86_64 ]\r\n<\/pre>\n<p>\u304a\u304a\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3067\u304d\u307e\u3057\u305f\u306d\u3002<br \/>\n\u3067\u306f\u65e9\u901f\u3055\u308f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>positive? negative?<\/h2>\n<p>Ruby2.3\u3067\u8ffd\u52a0\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u7c21\u5358\u306a\u3082\u306e\u304c\u3053\u308c<br \/>\n\u6570\u5b57\u304c\u6b63\u304b\u8ca0\u304b\u3092\u5224\u65ad\u3057\u3066\u304f\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\n-1.positive?\r\n => false\r\n-1.negative?\r\n => true\r\n<\/pre>\n<p>\u3053\u3046\u3044\u3046\u6570\u5024\u306e\u5224\u65ad\u3067\u7b26\u53f7\u306e\u5411\u304d\u3092\u9006\u306b\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u3001\u5c11\u3057\u4fbf\u5229\u304b\u3082\u3002<\/p>\n<h2>\u307c\u3063\u3061\u30aa\u30da\u30ec\u30fc\u30bf<\/h2>\n<p>safe navigation operator &. (\u307e\u305f\u306e\u540d\u3092\u307c\u3063\u3061\u30aa\u30da\u30ec\u30fc\u30bf) \u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<br \/>\n\u7c21\u5358\u306b\u8a00\u3046\u3068nil\u3067\u3082\u30a8\u30e9\u30fc\u3067\u307e\u305b\u3093\u3088\u3002\u3063\u3066\u3084\u3064\u3067\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\na = \"hoge\"\r\na.upcase\r\n => \"HOGE\"\r\n\r\na = nil\r\na.upcase\r\nNoMethodError: undefined method `upcase' for nil:NilClass\r\n\r\na&.upcase\r\n => nil\r\n<\/pre>\n<p>\u3063\u3066\u306a\u5177\u5408\u3067\u3059\u3002<\/p>\n<p>\u3067\u3082<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\na = \"hoge\"\r\na.upcase\r\n => \"HOGE\"\r\n\r\na.upcaseaaa\r\nNoMethodError: undefined method `upcaseaaa' for \"hoge\":String\r\nDid you mean?  upcase\r\n               upcase!\r\n\r\na&.upcaseaaa\r\nNoMethodError: undefined method `upcaseaaa' for \"hoge\":String\r\nDid you mean?  upcase\r\n               upcase!\r\n<\/pre>\n<p>\u3068\u307c\u3063\u3061\u30aa\u30da\u30ec\u30fc\u30bf\u3092\u4ed8\u3051\u3066\u3082nil\u4ee5\u5916\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u30e1\u30bd\u30c3\u30c9\u304c\u306a\u3044\u5834\u5408\u306fNoMethodError\u306e\u3088\u3046\u3067\u3059\u306d\u3002<br \/>\nActiveSupport\u306etry\u3067\u306f\u306a\u304ftry!\u306b\u8fd1\u3044\u306e\u304b\u306a\uff1f<br \/>\n\u3061\u306a\u307f\u306b<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\nDid you mean?  upcase\r\n               upcase!\r\n<\/pre>\n<p>\u3068\u51fa\u3066\u308b\u306e\u306fRuby2.3\u304b\u3089did_you_mean gem \u304c\u30d0\u30f3\u30c9\u30eb\u3055\u308c\u305f\u304b\u3089\u3067\u3059\u3002<br \/>\nNoMethodError\u306e\u6642\u306b\u4ed6\u306e\u5019\u88dc\u3092\u8868\u793a\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u3057\u3066\u3082\u307c\u3063\u3061\u30aa\u30da\u30ec\u30fc\u30bfwww<\/p>\n<h2>\u3075\u304b\u30fc\u30fc\u30fc\u3044\u968e\u5c64\u306b\u3044\u308b\u5024\u3092\u53d6\u5f97\u3059\u308b<\/h2>\n<p>\u6df1\u3044\u968e\u5c64\u306b\u3042\u308b\u30cf\u30c3\u30b7\u30e5\u306e\u5024\u3001\u914d\u5217\u306e\u5024\u3092\u4e00\u6c17\u306b\u53d6\u5f97\u3067\u304d\u308bHash#dig\u3001Array#dig\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u30cf\u30c3\u30b7\u30e5\u306e\u65b9\u3092\u4f8b\u3067<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\nparams = {hoge: {foo: \"\u30d5\u30fc\", var: {piyo: \"\u3074\u3088\"}}}\r\n => {:hoge=>{:foo=>\"\u30d5\u30fc\", :var=>{:piyo=>\"\u3074\u3088\"}}}\r\nparams[:hoge][:var][:piyo]\r\n => \"\u3074\u3088\"\r\nparams.dig(:hoge, :var, :piyo)\r\n => \"\u3074\u3088\"\r\n<\/pre>\n<p>\u3061\u3087\u3063\u3068\u66f8\u304d\u65b9\u304c\u7c21\u5358\u306b\u306a\u3063\u305f\u3060\u3051\uff1f\u3068\u601d\u3044\u304d\u3084<\/p>\n<pre class=\"lang:ruby decode:true \" >\r\nparams[:hoge][:foo][:piyo]\r\nTypeError: no implicit conversion of Symbol into Integer\r\n        from (irb):4:in `[]'\r\n        from (irb):4\r\n        from \/home\/dave\/.rvm\/rubies\/ruby-2.3.0-preview2\/bin\/irb:11:in `<main>'\r\nparams.dig(:hoge, :foo, :piyo)\r\n => nil\r\n<\/pre>\n<p>nil\u306b\u306a\u3063\u305f\u5834\u5408\u306b\u3082\u843d\u3061\u306a\u3044\uff01\uff01<br \/>\n\u3044\u3061\u3044\u3061nil\u30c1\u30a7\u30c3\u30af\u3057\u306a\u304f\u3066\u3044\u3044\u306e\u3067\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h2>Ruby2.3 + Rails4.2<\/h2>\n<p>\u4ed6\u306b\u3082\u8ffd\u52a0\u3055\u308c\u3066\u3044\u308b\u6a5f\u80fd\u3084\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3053\u3067\u306f\u3053\u306e\u8fba\u306b\u3057\u3066Ruby2.3\u3067Rails4.2\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u52d5\u304b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u3053\u3067\u306fRuby2.2\u3067\u4f5c\u3089\u308c\u305fRails\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092Ruby2.3\u306b\u3057\u3066\u518d\u69cb\u7bc9\u3001\u3064\u307e\u308aRuby2.2 \u21d2 Ruby2.3\u306e\u79fb\u884c\u3068\u3044\u3046\u3053\u3068\u3067\u3084\u308a\u307e\u3059\u3002<br \/>\n\u5bfe\u8c61\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067<\/p>\n<pre class=\"lang:sh decode:true \">\r\nbundle install --path vendor\/bundle --local\r\n<\/pre>\n<p>\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<br \/>\nvendor\u4ee5\u4e0b\u304c\u300cbundle\/ruby\/2.3.0\u300d\u3068\u306a\u3063\u3066\u307e\u3059\u3002<\/p>\n<pre class=\"lang:sh decode:true \">\r\nls -1 vendor\/bundle\/ruby\/2.3.0\/\r\n\r\nbin\/\r\nbuild_info\/\r\ncache\/\r\ndoc\/\r\nextensions\/\r\ngems\/\r\nspecifications\/\r\n<\/pre>\n<p>\u6b21\u306b\u30a2\u30d7\u30ea\u30b5\u30fc\u30d0\u30fc(unicorn)\u3092\u52d5\u4f5c\u3055\u305b\u3066\u52d5\u304d\u3092\u307f\u3066\u307f\u308b\u3068\u7279\u306b\u554f\u984c\u306a\u304f\u52d5\u4f5c\u3057\u3066\u307e\u3057\u305f\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3053\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u4f7f\u3063\u3066\u3044\u308bGem\u306f<\/p>\n<ul>\n<li>\u753b\u50cf\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9 paperclip<\/li>\n<li>\u691c\u7d22\u6a5f\u80fd ransack<\/li>\n<li>\u30da\u30fc\u30b8\u30f3\u30b0 kaminari<\/li>\n<\/ul>\n<p>\u306a\u3069\u304c\u3042\u308a\u3001\u554f\u984c\u306a\u304f\u52d5\u3044\u3066\u3044\u307e\u3057\u305f\u3002<br \/>\n\u4e92\u63db\u6027\u306f\u554f\u984c\u306a\u3044\u3088\u3046\u306b\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>12\u670825\u65e5\u306b\u30ea\u30ea\u30fc\u30b9\u4e88\u5b9a\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u6b21\u306e\u958b\u767a\u304b\u3089\u306fRuby2.3\u304c\u4f7f\u3048\u305d\u3046\u3067\u3059\u3002<\/p>\n<p>\u53c2\u8003\uff1ahttps:\/\/www.ruby-lang.org\/ja\/news\/2015\/12\/11\/ruby-2-3-0-preview2-released\/<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u306e\u6751\u4e0a\u3067\u3059\u3002<br \/>\nTECHSCORE Advent Calendar 2015 \u306e22\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u4eca\u6708\u306b\u3044\u3088\u3044\u3088Ruby2.3\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3059\u3002\u305f\u3076\u3093\u3002\u3002\u3002\u304a\u305d\u3089\u304f\u3002\u3002\u3002<br \/><a href=\"https:\/\/www.techscore.com\/blog\/2015\/12\/22\/ruby2-3%e3%82%92%e8%a7%a6%e3%81%a3%e3%81%a6%e3%81%bf%e3%82%8b\/\">\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[215,18],"tags":[141,24],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/9428"}],"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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=9428"}],"version-history":[{"count":16,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/9428\/revisions"}],"predecessor-version":[{"id":9771,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/9428\/revisions\/9771"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=9428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=9428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=9428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}