{"type":"rich","blog_title":"nakaearth\u306e\u65e5\u8a18","published":"2026-06-15 10:52:53","width":"100%","height":"190","provider_name":"Hatena Blog","url":"https://nakaearth.hatenadiary.org/entry/2026/06/15/105253","categories":[],"blog_url":"https://nakaearth.hatenadiary.org/","author_name":"nakaearth","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnakaearth.hatenadiary.org%2Fentry%2F2026%2F06%2F15%2F105253\" title=\"Rails \u306e PR\u3092\u898b\u3066\u6c17\u306b\u306a\u3063\u305f\u3068\u3053\u308d - nakaearth\u306e\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>","provider_url":"https://hatena.blog","image_url":null,"title":"Rails \u306e PR\u3092\u898b\u3066\u6c17\u306b\u306a\u3063\u305f\u3068\u3053\u308d","author_url":"https://blog.hatena.ne.jp/nakaearth/","description":"\u6570\u65e5\u524d\u306b\u4ee5\u4e0b\u306ePR\u304c\u76ee\u306b\u3064\u3044\u3066\u3001where.missing \u3084 where.associated \u3063\u3066\u4f55\u3060\u308d\u3046\u3068\u306a\u3063\u305f\u306e\u3067\u3001\u78ba\u8a8d\u3057\u3066\u307f\u305f\u3002 \u898b\u305fPR\u306f\u3053\u3061\u3089 \u3002 where.missing(:association \u3092\u6307\u5b9a) \u3053\u308c\u306f\u95a2\u9023\u5148\u306e\u30c7\u30fc\u30bf\u304c missing == \u7a7a \u306e\u30c7\u30fc\u30bf\u3092\u8fd4\u3059\u3002 \u4f8b\u3048\u3070 post \u3068\u3044\u3046\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057 comments \u3068\u3044\u3046\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u3063\u305f\u5834\u5408\u4ee5\u4e0b\u306e\u3088\u3046\u306aSQL\u306b\u306a\u308b Post.where.missing(:comments) => \"SELECT `posts`.* FROM `posts` LEFT OUTER JOIN `comments` `commen\u2026"}