{"author_url":"https://blog.hatena.ne.jp/kuronekopunk/","description":"\u3088\u304f\u5fd8\u308c\u308b\u8907\u6570\u30ab\u30e9\u30e0\u306e\u4e00\u610f\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3 2\u30ab\u30e9\u30e0\u306e\u5834\u5408 validates :column1, presence: true, uniqueness: { scope: :column2 } 3\u30ab\u30e9\u30e0\u4ee5\u4e0a\u306e\u5834\u5408 validates :column1, presence: true, uniqueness: { scope: [:column2, :column3] } Active Record \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3 - Rails\u30ac\u30a4\u30c9","height":"190","categories":["Ruby on Rails"],"title":"Rails \u8907\u6570\u30ab\u30e9\u30e0\u306e\u30e6\u30cb\u30fc\u30af\u5236\u7d04\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u8a2d\u5b9a\u3059\u308b","blog_title":"\u30ce\u30f3\u30ab\u30d5\u30a7\u30a4\u30f3\u3067\u3042\u306a\u305f\u306b\u3084\u3055\u3057\u3044","provider_name":"Hatena Blog","published":"2020-05-19 21:54:39","blog_url":"https://akinobu.net/","width":"100%","version":"1.0","type":"rich","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fakinobu.net%2Fentry%2F2020%2F05%2F19%2F215439\" title=\"Rails \u8907\u6570\u30ab\u30e9\u30e0\u306e\u30e6\u30cb\u30fc\u30af\u5236\u7d04\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u8a2d\u5b9a\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>","url":"https://akinobu.net/entry/2020/05/19/215439","author_name":"kuronekopunk","provider_url":"https://hatena.blog"}