{"published":"2019-06-18 22:48:26","description":"Ruby on Rails\u3067\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002 \u305d\u3082\u305d\u3082\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u77e5\u308a\u305f\u3044\u6642 \u30ed\u30b0\u30a4\u30f3\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u304c\u7ba1\u7406\u8005\u30e6\u30fc\u30b6\u30fc\u304c\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u305f\u3044 \u305d\u3093\u306a\u6642\u306fModel.exists?()\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3063\u3066\u8a71\u3067\u3059\u3002 \u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b \u6761\u4ef6\u4ed8\u304d\u3067\u5b58\u5728\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b find_by\u3082\u540c\u3058\u4f7f\u3044\u65b9\u51fa\u6765\u308b\u3058\u3083\u306d\uff1f \u53c2\u8003\u30b5\u30a4\u30c8 \u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b > User.exists? User Exists (3.0ms) SELECT 1 AS one FROM \"users\" LIMIT $1 [[\"LIMIT\", 1]] =\u2026","title":"\u3010Rails\u3011\u30c7\u30fc\u30bf\u304c1\u4ef6\u3067\u3082\u3042\u308b\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306b\u306f`Model.exists?`","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fopiyotan.hatenablog.com%2Fentry%2Ftips-model-exists\" title=\"\u3010Rails\u3011\u30c7\u30fc\u30bf\u304c1\u4ef6\u3067\u3082\u3042\u308b\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306b\u306f`Model.exists?` - \u304a\u3074\u3088\u306e\u6c17\u307e\u3050\u308c\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":["Ruby","Rails","Tips"],"provider_url":"https://hatena.blog","type":"rich","width":"100%","blog_url":"https://opiyotan.hatenablog.com/","author_url":"https://blog.hatena.ne.jp/opiyotan/","provider_name":"Hatena Blog","height":"190","author_name":"opiyotan","blog_title":"\u304a\u3074\u3088\u306e\u6c17\u307e\u3050\u308c\u65e5\u8a18","version":"1.0","image_url":"https://cdn.user.blog.st-hatena.com/default_entry_og_image/110785513/1514221383750427","url":"https://opiyotan.hatenablog.com/entry/tips-model-exists"}