{"height":"190","author_name":"murajun1978","version":"1.0","blog_title":"Murajun's Style","url":"https://murajun1978.hatenadiary.com/entry/2014/09/11/225037","image_url":null,"author_url":"https://blog.hatena.ne.jp/murajun1978/","blog_url":"https://murajun1978.hatenadiary.com/","provider_name":"Hatena Blog","title":"Rails\u306emodel\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067exists?\u3092\u4f7f\u3046\u3068...","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmurajun1978.hatenadiary.com%2Fentry%2F2014%2F09%2F11%2F225037\" title=\"Rails\u306emodel\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067exists?\u3092\u4f7f\u3046\u3068... - Murajun&#39;s Style\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":["Ruby","Rails"],"provider_url":"https://hatena.blog","type":"rich","width":"100%","published":"2014-09-11 22:50:37","description":"Array#include?\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u6539\u5584\u30d8(^o^)\u30ce\u3067\u6539\u5584\u3055\u308c\u305f\u30ec\u30b9\u30dd\u30f3\u30b9\u3067\u3059\u304c\u3001\u307e\u3060\u9045\u3044w \u3068\u8a00\u3046\u308f\u3051\u3067\u3001\u30ed\u30b0\u3092\u773a\u3081\u3066\u3044\u307e\u3057\u305f\u30fc \u3059\u308b\u3068\u3053\u3093\u306a\u30af\u30a8\u30ea\u30fc\u304c... \u6ce8) \u30c6\u30fc\u30d6\u30eb\u540d\u306f\u52dd\u624b\u306b\u3064\u3051\u305f Post Exists (0.2ms) SELECT 1 AS one FROM \"posts\" LIMIT 1 \u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u3053\u3093\u306a\u4e8b\u3057\u3066\u305f def comments(posts) if posts.exists? # \u30c7\u30fc\u30bf\u304c\u3042\u308b\u3068\u304d\u306e\u51e6\u7406 end end \u30e2\u30c7\u30eb\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067exists?\u3059\u308b\u3068\u30af\u30a8\u30ea\u30fc\u767a\u884c\u3059\u308b\u306e\u3067\u3059\u306d... \u666e\u6bb5\u306fposts.present?\u3068\u3059\u308b\u306e\u3067\u77e5\u3089\u3093\u304b\u3063\u305f \u306a\u2026"}