{"published":"2018-08-21 02:25:40","version":"1.0","height":"190","categories":["Ruby","Ruby on Rails"],"type":"rich","author_name":"rnakamine","width":"100%","description":"\u3059\u3067\u306bindex\u304c\u8cbc\u3089\u308c\u3066\u3044\u308b\u30ab\u30e9\u30e0\u306b\u5bfe\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bmigration\u30d5\u30a1\u30a4\u30eb\u3092\u7de8\u96c6\u3057\u3066unique\u5236\u9650\u3092\u304b\u3051\u3088\u3046\u3068\u3057\u305f\u6642\u306b def change add_index :users, :email, unique: true end \u305d\u306e\u307e\u307edb:migrate\u3059\u308b\u3068 Index name 'index_users_on_email' on table 'users' already exists \u3068\u6012\u3089\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u305d\u306e\u5bfe\u7b56\u30e1\u30e2 \u5bfe\u5fdc \u305d\u306e\u307e\u307eindex\u3092\u8ffd\u52a0\u3059\u308b\u3068\u65e2\u306b\u5b58\u5728\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u30a8\u30e9\u30fc\u304c\u3067\u3066\u3057\u307e\u3046\u306e\u3067\u3001 \u4e00\u65e6\u3001index\u3092\u524a\u9664\u3057\u3066\u304b\u3089unique\u5236\u9650\u3092\u304b\u3051\u308b\u3068\u3001\u4e0a\u624b\u304f\u3044\u3063\u305f\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frnakamine.hatenablog.com%2Fentry%2F2018%2F08%2F21%2F022540\" title=\"\u3059\u3067\u306bindex\u8cbc\u3089\u308c\u3066\u3044\u308b\u30ab\u30e9\u30e0\u306b\u5bfe\u3057\u3066unique\u5236\u9650\u3092\u304b\u3051\u308b\u65b9\u6cd5 - Ruby on Rails - Ryo Nakamine\" 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://rnakamine.hatenablog.com/entry/2018/08/21/022540","author_url":"https://blog.hatena.ne.jp/rnakamine/","provider_url":"https://hatena.blog","title":"\u3059\u3067\u306bindex\u8cbc\u3089\u308c\u3066\u3044\u308b\u30ab\u30e9\u30e0\u306b\u5bfe\u3057\u3066unique\u5236\u9650\u3092\u304b\u3051\u308b\u65b9\u6cd5 - Ruby on Rails","provider_name":"Hatena Blog","blog_title":"Ryo Nakamine","image_url":null,"blog_url":"https://rnakamine.hatenablog.com/"}