{"width":"100%","title":"Ruby / Rails \u958b\u767a\u3067\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\uff08\u5b9f\u52d9\u3067\u30cf\u30de\u308a\u304c\u3061\u306a\u30dd\u30a4\u30f3\u30c8\uff09","version":"1.0","published":"2026-06-12 14:55:33","provider_name":"Hatena Blog","type":"rich","provider_url":"https://hatena.blog","height":"190","author_name":"s-hirose_he","categories":["Rails","Ruby","\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0"],"image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/m/media-zenet/20260612/20260612145437.png","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmedia.zenet-web.co.jp%2Fentry%2F2026%2F06%2F12%2F145533\" title=\"Ruby / Rails \u958b\u767a\u3067\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\uff08\u5b9f\u52d9\u3067\u30cf\u30de\u308a\u304c\u3061\u306a\u30dd\u30a4\u30f3\u30c8\uff09 - Zenet Tech Blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"Zenet Tech Blog","url":"https://media.zenet-web.co.jp/entry/2026/06/12/145533","blog_url":"https://media.zenet-web.co.jp/","description":"\u30bc\u30cd\u30c3\u30c8\u306e\u5ee3\u702c\u3067\u3059\u3002 Ruby / Rails \u306f\u300c\u66f8\u304d\u3084\u3059\u3044\u8a00\u8a9e\u30fb\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u300d\u3068\u3057\u3066\u6709\u540d\u3067\u3059\u3002 \u3057\u304b\u3057\u5b9f\u52d9\u3067\u306f \u306a\u305c\u304b NoMethodError\u304c\u51fa\u308b update\u304c\u5931\u6557\u3057\u3066\u3044\u308b\u306e\u306b\u51e6\u7406\u304c\u9032\u3080 includes\u3092\u4f7f\u3063\u305f\u306e\u306b\u30af\u30a8\u30ea\u304c\u5897\u3048\u308b \u3068\u3044\u3063\u305f \u300c\u4ed5\u69d8\u3092\u77e5\u3089\u306a\u3044\u3068\u30cf\u30de\u308b\u30dd\u30a4\u30f3\u30c8\u300d \u304c\u6570\u591a\u304f\u3042\u308a\u307e\u3059\u3002 \u5b9f\u969b\u306e\u958b\u767a\u3067\u3082\u3001\u3053\u3046\u3057\u305f\u6319\u52d5\u304c\u539f\u56e0\u3067 \u30d0\u30b0\u8abf\u67fb\u306b\u6642\u9593\u3092\u53d6\u3089\u308c\u308b\u30b1\u30fc\u30b9\u306f\u5c11\u306a\u304f\u3042\u308a\u307e\u305b\u3093\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Ruby / Rails \u958b\u767a\u3067\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\u3092\u53d6\u308a\u4e0a\u3052\u3001 \u306a\u305c\u554f\u984c\u306b\u306a\u308b\u306e\u304b \u3069\u3046\u66f8\u3051\u3070\u5b89\u5168\u306a\u306e\u304b \u3092\u5b9f\u4f8b\u3068\u3068\u3082\u306b\u6574\u7406\u3057\u307e\u3059\u3002 1. find_by \u306f\u30d2\u30c3\u30c8\u3057\u306a\u3044\u3068 nil \u3092\u8fd4\u2026","author_url":"https://blog.hatena.ne.jp/s-hirose_he/"}