{"categories":["Ruby","Rails","ActiveRecord"],"provider_name":"Hatena Blog","type":"rich","width":"100%","height":"190","image_url":null,"description":"\u5c5e\u6027\u540d? \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u5c5e\u6027\u306e\u5024\u304cBoolean\u3068\u3057\u3066\u89e3\u91c8\u3055\u308c\u308b\u3002 0(\u6570\u5024),\"0\"(\u6587\u5b57\u5217),\"f\",\"false\"(\u6587\u5b57\u5217),\"\",nil,false(Ruby\u306ebool\u578b\u5b9a\u6570)=>false \u305d\u308c\u4ee5\u5916=>true p user.name #=> \"false\" p user.name? #=> false p user2.name #=> \"David\" p user2.name? #=> true p user3.name #=> 0 p user3.name? #=> false \u305d\u306e\u307b\u304b\u306e\u5024\u3092Bool\u5024\u3068\u3057\u3066\u4f7f\u3046\u5834\u5408\u306f\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u3002 class Name Act\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkoki-h.hatenadiary.org%2Fentry%2F20060731%2Fp1\" title=\"\u5c5e\u6027\u306e\u5024\u3092Boolean\u3068\u3057\u3066\u8a55\u4fa1\u3059\u308b - \u6a4b\u672c\u5e78\u6a39\u306e\u7121\u611b\u60f3\u306a\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","author_url":"https://blog.hatena.ne.jp/koki-h/","blog_title":"\u6a4b\u672c\u5e78\u6a39\u306e\u7121\u611b\u60f3\u306a\u65e5\u8a18","published":"2006-07-31 00:00:00","title":"\u5c5e\u6027\u306e\u5024\u3092Boolean\u3068\u3057\u3066\u8a55\u4fa1\u3059\u308b","provider_url":"https://hatena.blog","author_name":"koki-h","url":"https://koki-h.hatenadiary.org/entry/20060731/p1","blog_url":"https://koki-h.hatenadiary.org/"}