{"provider_name":"Hatena Blog","published":"2015-07-11 02:51:05","url":"https://yo-iida.hatenablog.com/entry/2015/07/11/025105","blog_url":"https://yo-iida.hatenablog.com/","version":"1.0","author_name":"yo-iida","author_url":"https://blog.hatena.ne.jp/yo-iida/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyo-iida.hatenablog.com%2Fentry%2F2015%2F07%2F11%2F025105\" title=\"\u89aa\u5b50\u95a2\u4fc2\u306e\u30e2\u30c7\u30eb\u306e\u53d6\u308a\u6271\u3044 - yo-log\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\u89aa\u5b50\u95a2\u4fc2\u306e\u30e2\u30c7\u30eb\u306e\u53d6\u308a\u6271\u3044","blog_title":"yo-log","provider_url":"https://hatena.blog","width":"100%","image_url":null,"height":"190","categories":["Ruby on Rails"],"description":"\u89aa\u5b50\u95a2\u4fc2\u306e\u30e2\u30c7\u30eb\u306e\u53d6\u308a\u6271\u3044\u3067\u3001has_many\u3068has_one\u3067\u521d\u671f\u5316\u306e\u65b9\u6cd5\u304c\u9055\u3046\u3053\u3068\u3092\u77e5\u3089\u305a\u306b\u8a70\u307e\u308a\u307e\u3057\u305f\u3002 User\u30e2\u30c7\u30eb\u3068\u305d\u308c\u306b\u7d10\u3065\u304fAddress\u30e2\u30c7\u30eb\u304cOne-to-One\u3001Purchase\u30e2\u30c7\u30eb\u304cOne-to-Many\u3060\u3068\u3057\u307e\u3059\u3002 \u3053\u306e\u3068\u304d\u3001\u30e2\u30c7\u30eb\u306e\u5b9a\u7fa9\u306f\u3001\u7c21\u6613\u7684\u306b\u3001 class User < ActiveRecord::Base has_one :address has_many :purchases end class Address < ActiveRecord::Base belongs_to :user end class Purchase < ActiveRecord:\u2026","type":"rich"}