{"id":160,"date":"2018-12-13T15:13:17","date_gmt":"2018-12-13T15:13:17","guid":{"rendered":"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/"},"modified":"2018-12-13T15:13:17","modified_gmt":"2018-12-13T15:13:17","slug":"2018-12-13-151317","status":"publish","type":"post","link":"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/","title":{"rendered":"\u3010Ruby\u3011\u6570\u5b57\u53d6\u308a\u6271\u3044\u6642\u306e\u6ce8\u610f\u70b9 | \u6697\u9ed9\u5909\u63db\u3057\u306a\u3044"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/#%E3%81%AF%E3%81%98%E3%82%81%E3%81%AB\" >\u306f\u3058\u3081\u306b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/#Ruby%E3%81%A7%E3%81%AF%E6%9A%97%E9%BB%99%E5%A4%89%E6%8F%9B%E3%81%AF%E3%81%82%E3%82%8A%E3%81%BE%E3%81%9B%E3%82%93\" >Ruby\u3067\u306f\u6697\u9ed9\u5909\u63db\u306f\u3042\u308a\u307e\u305b\u3093<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/#%E6%96%87%E5%AD%97%E5%88%97%E3%82%92%E6%95%B0%E5%AD%97%E3%81%AB%E7%9B%B4%E7%B5%90%E3%81%A7%E3%81%8D%E3%81%AA%E3%81%84\" >\u6587\u5b57\u5217\u3092\u6570\u5b57\u306b\u76f4\u7d50\u3067\u304d\u306a\u3044<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/#%E5%BC%8F%E5%B1%95%E9%96%8B%E6%99%82%E3%81%AB%E3%81%AFto_s%E3%81%95%E3%82%8C%E3%82%8B\" >\u5f0f\u5c55\u958b\u6642\u306b\u306fto_s\u3055\u308c\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/oidema-jp.com\/media\/2018-12-13-151317\/#%E6%9C%80%E5%BE%8C%E3%81%AB\" >\u6700\u5f8c\u306b<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"i-0\"><span class=\"ez-toc-section\" id=\"%E3%81%AF%E3%81%98%E3%82%81%E3%81%AB\"><\/span>\u306f\u3058\u3081\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u4eca\u56de\u306e\u8a18\u4e8b\u306f\u524d\u56de\u306e\u8a18\u4e8b\u306e\u7d9a\u304d\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Foidema-jp.com%2Fmedia%2Fentry%2F2018%2F12%2F13%2F143322\" title=\"\u3010Ruby\u3011\u6570\u5b57\u53d6\u308a\u6271\u3044\u6642\u306e\u6ce8\u610f\u70b9 - \u8b83\u5c90\u5c0f\u50e7\u306eEngineering\u00d7Tech\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"><\/iframe><cite class=\"hatena-citation\"><a href=\"https:\/\/oidema-jp.com\/media\/entry\/2018\/12\/13\/143322\">www.sanuki-kozo.com<\/a><\/cite><\/p>\n<p>\u305d\u308c\u3067\u306f\u5f15\u304d\u7d9a\u304d\u3001\u6570\u5b57\u53d6\u308a\u6271\u3044\u6642\u306e\u6ce8\u610f\u70b9\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2 id=\"i-1\"><span class=\"ez-toc-section\" id=\"Ruby%E3%81%A7%E3%81%AF%E6%9A%97%E9%BB%99%E5%A4%89%E6%8F%9B%E3%81%AF%E3%81%82%E3%82%8A%E3%81%BE%E3%81%9B%E3%82%93\"><\/span><a class=\"keyword\" href=\"http:\/\/d.hatena.ne.jp\/keyword\/Ruby\">Ruby<\/a>\u3067\u306f\u6697\u9ed9\u5909\u63db\u306f\u3042\u308a\u307e\u305b\u3093<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5c0f\u50e7\u304c\u4ed6\u306e\u8a00\u8a9e\u306b\u8a73\u3057\u3044\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u4f8b\u3048\u3070<a class=\"keyword\" href=\"http:\/\/d.hatena.ne.jp\/keyword\/SQL\">SQL<\/a>\u3068\u304b\u3067\u6570\u5b57\u3063\u307d\u3044\u6587\u5b57\u30c7\u30fc\u30bf\u3092\u6307\u5b9a\u305b\u305a\u306b\u6570\u5b57\u306b\u5909\u63db\u3057\u3066\u304f\u308c\u305f\u308a\u3001\u6587\u5b57\u304b\u3089\u65e5\u4ed8\u3001\u65e5\u4ed8\u304b\u3089\u6587\u5b57\u306a\u3069\u3001\u69d8\u3005\u30b7\u30fc\u30f3\u3067\u6697\u9ed9\u5909\u63db\u304c\u884c\u308f\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u306a\u304c\u3089<a class=\"keyword\" href=\"http:\/\/d.hatena.ne.jp\/keyword\/Ruby\">Ruby<\/a>\u3067\u306f\u6697\u9ed9\u5909\u63db\u3092\u884c\u308f\u306a\u3044\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u3067\u306f\u5b9f\u969b\u306b\u5b9f\u884c\u3057\u306a\u304c\u3089\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">irb(main):025:0* 5 + \"5\"\nTypeError: String can't be coerced into Fixnum\nfrom (irb):25:in `+'\nfrom (irb):25\nfrom \/Users\/user_name\/.rbenv\/versions\/2.3.1\/bin\/irb:11:in `&lt;main&gt;'<\/pre>\n<p>5\uff08\u6570\u5b57\uff09\uff0b5\uff08\u6587\u5b57\uff09\u3092\u8db3\u3057\u3066\u307f\u305f\u7d50\u679c\u3067\u3059\u304c\u30a8\u30e9\u30fc\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u3067\u306f\u6b21\u306f<code>to_i<\/code>\u3057\u3066\u5b9f\u884c\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">irb(main):026:0&gt; 5 + \"5\".to_i\n=&gt; 10<\/pre>\n<p><code>to_i<\/code>\u3059\u308b\u3068\u898b\u4e8b\u306b\u30a8\u30e9\u30fc\u3068\u306a\u3089\u305a\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<h2 id=\"i-2\"><span class=\"ez-toc-section\" id=\"%E6%96%87%E5%AD%97%E5%88%97%E3%82%92%E6%95%B0%E5%AD%97%E3%81%AB%E7%9B%B4%E7%B5%90%E3%81%A7%E3%81%8D%E3%81%AA%E3%81%84\"><\/span>\u6587\u5b57\u5217\u3092\u6570\u5b57\u306b\u76f4\u7d50\u3067\u304d\u306a\u3044<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a class=\"keyword\" href=\"http:\/\/d.hatena.ne.jp\/keyword\/Ruby\">Ruby<\/a>\u3067\u306f\u6697\u9ed9\u5909\u63db\u304c\u306a\u3044\u305f\u3081\u6587\u5b57\u306b\u6570\u5b57\u3092\u76f4\u7d50\u3082\u660e\u793a\u7684\u306a\u6307\u793a\u304c\u306a\u3044\u9650\u308a\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u4e0b\u8a18\u306f\u201dnumber\u201d\u3068\u8a00\u3046\u6587\u5b57\u5217\u30685\u3068\u3044\u3046\u6570\u5b57\u3092\u9023\u7d50\u3055\u305b\u3088\u3046\u3068\u3057\u3066\u3044\u307e\u3059\u304c\u30a8\u30e9\u30fc\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">irb(main):031:0&gt; \"number\" + 5\nTypeError: no implicit conversion of Fixnum into String\nfrom (irb):31:in `+'\nfrom (irb):31\nfrom \/Users\/user_name\/.rbenv\/versions\/2.3.1\/bin\/irb:11:in `&lt;main&gt;'<\/pre>\n<p>\u3053\u3061\u3089\u3082\u660e\u793a\u7684\u306b<code>to_s<\/code>\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u9023\u7d50\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u65e9\u901f\u5b9f\u65bd\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">irb(main):039:0* \"number\" + 5.to_s\n=&gt; \"number5\"<\/pre>\n<p>\u201cnumber5\u2033\u3068\u671f\u5f85\u3059\u308b\u30c7\u30fc\u30bf\u304c\u8fd4\u3063\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<h2 id=\"i-3\"><span class=\"ez-toc-section\" id=\"%E5%BC%8F%E5%B1%95%E9%96%8B%E6%99%82%E3%81%AB%E3%81%AFto_s%E3%81%95%E3%82%8C%E3%82%8B\"><\/span>\u5f0f\u5c55\u958b\u6642\u306b\u306f<code>to_s<\/code>\u3055\u308c\u308b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u4e0b\u8a18\u306e\u3088\u3046\u306bnumber\u306b\u6570\u5b57\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u3066\u304b\u3064\u3001\u5f0f\u5c55\u958b\u3092\u7528\u3044\u3066\u6570\u5b57\u3068\u6587\u5b57\u3092\u9023\u7d50\u3057\u305f\u3044\u5834\u5408\u306f\u81ea\u52d5\u7684\u306b<code>to_s<\/code>\u304c\u547c\u3070\u308c\u308b\u305f\u3081\u660e\u793a\u7684\u306b<code>to_s<\/code>\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">irb(main):005:0* number = 4\n=&gt; 4\nirb(main):008:0* \"#{number}\u756a\u30d0\u30c3\u30bf\u30fc\"\n=&gt; \"4\u756a\u30d0\u30c3\u30bf\u30fc\"<\/pre>\n<p>\u203b\u305d\u306e\u4ed6\u3001\u6570\u5b57\u53d6\u308a\u6271\u3044\u3067\u306f<a class=\"keyword\" href=\"http:\/\/d.hatena.ne.jp\/keyword\/%B4%DD%A4%E1%B8%ED%BA%B9\">\u4e38\u3081\u8aa4\u5dee<\/a>\u306a\u3069\u304c\u53d6\u308a\u4e0a\u3052\u3089\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u4eca\u56de\u306f\u5272\u611b\u3057\u307e\u3059\u3002<\/p>\n<h2 id=\"i-4\"><span class=\"ez-toc-section\" id=\"%E6%9C%80%E5%BE%8C%E3%81%AB\"><\/span>\u6700\u5f8c\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u306f<a href=\"https:\/\/www.amazon.co.jp\/%E3%83%97%E3%83%AD%E3%82%92%E7%9B%AE%E6%8C%87%E3%81%99%E4%BA%BA%E3%81%AE%E3%81%9F%E3%82%81%E3%81%AERuby%E5%85%A5%E9%96%80-%E8%A8%80%E8%AA%9E%E4%BB%95%E6%A7%98%E3%81%8B%E3%82%89%E3%83%86%E3%82%B9%E3%83%88%E9%A7%86%E5%8B%95%E9%96%8B%E7%99%BA%E3%83%BB%E3%83%87%E3%83%90%E3%83%83%E3%82%B0%E6%8A%80%E6%B3%95%E3%81%BE%E3%81%A7-Software-Design-plus%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA\/dp\/4774193976\">\u30d7\u30ed\u3092\u76ee\u6307\u3059\u4eba\u306e\u305f\u3081\u306eRuby\u5165\u9580<\/a>\u304b\u3089\u5b66\u3093\u3060\u3053\u3068\u3092\u53c2\u8003\u306b\u3057\u3066\u5185\u5bb9\u304c\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><a class=\"keyword\" href=\"http:\/\/d.hatena.ne.jp\/keyword\/Ruby\">Ruby<\/a>\u3092\u672c\u683c\u7684\u306b\u52c9\u5f37\u3057\u305f\u3044\u3068\u8003\u3048\u3089\u308c\u3066\u3044\u308b\u65b9\u306f\u662f\u975e\u3001\u4e0b\u8a18\u30ea\u30f3\u30af\u306b\u66f8\u7c4d\u306e\u30ea\u30f3\u30af\u3092\u8cbc\u3063\u3066\u3044\u308b\u306e\u3067\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.amazon.co.jp\/gp\/product\/4774193976\/ref=as_li_tl?ie=UTF8&amp;camp=247&amp;creative=1211&amp;creativeASIN=4774193976&amp;linkCode=as2&amp;tag=keisukegdk-22&amp;linkId=6761ac338134e7b4b20228e093d0f356\" rel=\"noopener\"><img decoding=\"async\" border=\"0\" src=\"\/\/ws-fe.amazon-adsystem.com\/widgets\/q?_encoding=UTF8&amp;MarketPlace=JP&amp;ASIN=4774193976&amp;ServiceVersion=20070822&amp;ID=AsinImage&amp;WS=1&amp;Format=_SL250_&amp;tag=keisukegdk-22\"><\/a><img loading=\"lazy\" decoding=\"async\" src=\"\/\/ir-jp.amazon-adsystem.com\/e\/ir?t=keisukegdk-22&amp;l=am2&amp;o=9&amp;a=4774193976\" width=\"1\" height=\"1\" border=\"0\" alt=\"\" style=\"border:none !important; margin:0px !important;\"><\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/blog.hatena.ne.jp\/keisuke8925gdk\/keisuke8925gdk.hatenablog.com\/subscribe\/iframe\" allowtransparency=\"true\" frameborder=\"0\" scrolling=\"no\" width=\"150\" height=\"28\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u306b \u4eca\u56de\u306e\u8a18\u4e8b\u306f\u524d\u56de\u306e\u8a18\u4e8b\u306e\u7d9a\u304d\u3068\u306a\u308a\u307e\u3059\u3002 www.sanuki-kozo.com \u305d\u308c\u3067\u306f\u5f15\u304d\u7d9a\u304d\u3001\u6570\u5b57\u53d6\u308a\u6271\u3044\u6642\u306e\u6ce8\u610f\u70b9\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002 Ruby\u3067\u306f\u6697\u9ed9\u5909\u63db\u306f\u3042\u308a\u307e\u305b\u3093 \u5c0f\u50e7\u304c\u4ed6\u306e\u8a00\u8a9e\u306b\u8a73\u3057\u3044\u308f\u3051\u3067\u306f\u3042\u308a\u307e &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"footnotes":""},"categories":[11],"tags":[],"class_list":{"0":"post-160","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ruby","7":"entry","8":"nothumb"},"acf":[],"aioseo_notices":[],"mb":[],"mfb_rest_fields":["title","aioseo_notices"],"_links":{"self":[{"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/posts\/160","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/comments?post=160"}],"version-history":[{"count":0,"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/posts\/160\/revisions"}],"wp:attachment":[{"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/media?parent=160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/categories?post=160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oidema-jp.com\/media\/wp-json\/wp\/v2\/tags?post=160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}