{"blog_url":"https://ayaketan.hatenablog.com/","height":"190","type":"rich","url":"https://ayaketan.hatenablog.com/entry/2013/10/25/103039","categories":["Ruby"],"provider_name":"Hatena Blog","width":"100%","title":"Rails4 find\u3067ActiveRecord::RecordNotFound\u3067\u306f\u306a\u304fnil\u3092\u8fd4\u3057\u305f\u3044","blog_title":"ayaketan\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u52c9\u5f37\u65e5\u8a18","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fayaketan.hatenablog.com%2Fentry%2F2013%2F10%2F25%2F103039\" title=\"Rails4 find\u3067ActiveRecord::RecordNotFound\u3067\u306f\u306a\u304fnil\u3092\u8fd4\u3057\u305f\u3044 - 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","image_url":null,"author_name":"ayaketan","published":"2013-10-25 10:30:39","provider_url":"https://hatena.blog","description":"find\u3067\u5931\u6557\u3059\u308b\u3068ActiveRecord::RecordNotFound\u304c\u8fd4\u3063\u3066\u304f\u308b\u3002 \u4f8b\u5916\u51e6\u7406\u3092\u3057\u3066\u3082\u3044\u3044\u304c\u3001\u3061\u3087\u3063\u3068\u3081\u3093\u3069\u304f\u3055\u3044\u306e\u3067nil\u304c\u8fd4\u3063\u3066\u304f\u308b\u3088\u3046\u306b\u3057\u305f\u304b\u3063\u305f\u3002 find_by_id\u3068\u3044\u3046\u624b\u3082\u3042\u3063\u305f\u304c\u3001Rails4\u3067\u306ffind_by\u3067\u30cf\u30c3\u30b7\u30e5\u304c\u6e21\u305b\u308b\u306e\u3067\u3001find_by\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3057\u305f\u3002 if User.find_by(:id => user_id) == nil # \u4efb\u610f\u306e\u4f8b\u5916\u51e6\u7406 end \u53c2\u8003\uff1a [Ruby on Rails] find \u3067 ActiveRecord::RecordNotFound | CodeNote.net #400 What's New in Ra\u2026","author_url":"https://blog.hatena.ne.jp/ayaketan/"}