{"categories":["Rails"],"height":"190","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fimaharu-blog.hatenadiary.jp%2Fentry%2F2019%2F06%2F06%2F005522\" title=\"Active Record joins\u306b\u3064\u3044\u3066 - \u30b9\u30c8\u30ed\u30f3\u30b0\u30bc\u30ed\u306f\u7761\u7720\u85ac\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://imaharu-blog.hatenadiary.jp/","title":"Active Record joins\u306b\u3064\u3044\u3066","blog_title":"\u30b9\u30c8\u30ed\u30f3\u30b0\u30bc\u30ed\u306f\u7761\u7720\u85ac","type":"rich","width":"100%","author_name":"scratch_world","published":"2019-06-06 00:55:22","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/scratch_world/","provider_name":"Hatena Blog","url":"https://imaharu-blog.hatenadiary.jp/entry/2019/06/06/005522","version":"1.0","description":"Active Record\u306ejoins\u3068merge\u306b\u3064\u3044\u3066\u8abf\u67fb\u3057\u305f\u30ec\u30dd\u30fc\u30c8\u3067\u3059\u3002 \u6e96\u5099 \u307e\u305a\u306f\u3001migration\u30d5\u30a1\u30a4\u30eb\u3092\u8a2d\u5b9a class CreateUserPlans < ActiveRecord::Migration[5.2] def change create_table :user_plans do |t| t.integer :user_id t.integer :plan_code end end end class CreateUsers < ActiveRecord::Migration[5.2] def change create_table :users do |t| \u2026"}