{"url":"https://ayaketan.hatenablog.com/entry/2013/09/23/174207","provider_url":"https://hatena.blog","title":"Rails4 includes\u3067\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u3092\u5148\u8aad\u307f","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fayaketan.hatenablog.com%2Fentry%2F2013%2F09%2F23%2F174207\" title=\"Rails4 includes\u3067\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u3092\u5148\u8aad\u307f - ayaketan\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u52c9\u5f37\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","categories":["Ruby"],"height":"190","width":"100%","author_name":"ayaketan","blog_url":"https://ayaketan.hatenablog.com/","author_url":"https://blog.hatena.ne.jp/ayaketan/","type":"rich","blog_title":"ayaketan\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u52c9\u5f37\u65e5\u8a18","published":"2013-09-23 17:42:07","provider_name":"Hatena Blog","description":"\u30b0\u30eb\u30fc\u30d7\u306b\u6240\u5c5e\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306e\u540d\u524d\u4e00\u89a7\u3092\u8868\u793a\u3057\u305f\u304b\u3063\u305f\u3002 Group\u30c6\u30fc\u30d6\u30eb\u306b\u306fuser_id\u3092\u6301\u3064\u3002User\u30c6\u30fc\u30d6\u30eb\u306ename\u306b\u306f\u30e6\u30fc\u30b6\u30fc\u540d\u304c\u5165\u3063\u3066\u3044\u308b\u3002\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u306e\u5148\u8aad\u307f\u3092\u3059\u308b\u5834\u5408\u3001includes\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u3060\u3002Group\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc\u306eindex\u306b\u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8f09\u3059\u308b\u3002 @groups = Group.includes(:user). where(:group_id => 1) \u30d3\u30e5\u30fc\u306eINDEX\u306b\u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8f09\u3059\u308b\u3002 <% @groups.each do |group| %> <tr> <td><%= group.group_id %></td> <td><%= group.u\u2026"}