{"provider_url":"https://hatena.blog","height":"190","author_name":"kuronekopunk","title":"Rails\u3067primary_key\u3068foreign_key\u306e\u4e21\u65b9\u3092\u6307\u5b9a\u3057\u3066\u4e3b\u30ad\u30fc\u3067\u306f\u306a\u3044\u30ab\u30e9\u30e0\u3067\u95a2\u9023\u4ed8\u3051\u3059\u308b","width":"100%","provider_name":"Hatena Blog","url":"https://akinobu.net/entry/2017/06/13/171018","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fakinobu.net%2Fentry%2F2017%2F06%2F13%2F171018\" title=\"Rails\u3067primary_key\u3068foreign_key\u306e\u4e21\u65b9\u3092\u6307\u5b9a\u3057\u3066\u4e3b\u30ad\u30fc\u3067\u306f\u306a\u3044\u30ab\u30e9\u30e0\u3067\u95a2\u9023\u4ed8\u3051\u3059\u308b - \u30ce\u30f3\u30ab\u30d5\u30a7\u30a4\u30f3\u3067\u3042\u306a\u305f\u306b\u3084\u3055\u3057\u3044\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2017-06-13 17:10:18","description":"\u3053\u3093\u306a\u95a2\u9023\u4ed8\u3051\u306e\u30e2\u30c7\u30eb\u304c\u3042\u3063\u305f\u3068\u3057\u3066 class Atable < ApplicationRecord has_one :btable has_one :ctable end class Btable < ApplicationRecord belongs_to :atable end class Ctable < ApplicationRecord belongs_to :atable end b\u304b\u3089c\u3092\u547c\u3073\u51fa\u3059\u306e\u306b Btable.find(1).atable.ctable \u3068\u3057\u306a\u304d\u3083\u3044\u3051\u306a\u3044\u306e\u306f\u3060\u308b\u3044 btables.atable_id = ctables.atable_id \u306e\u6761\u4ef6\u3067\u95a2\u9023\u2026","categories":["Ruby on Rails"],"type":"rich","author_url":"https://blog.hatena.ne.jp/kuronekopunk/","blog_url":"https://akinobu.net/","image_url":null,"blog_title":"\u30ce\u30f3\u30ab\u30d5\u30a7\u30a4\u30f3\u3067\u3042\u306a\u305f\u306b\u3084\u3055\u3057\u3044","version":"1.0"}