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定義してないのになぜか使える activated? admin? メソッド Ruby on Rails チュートリアル

Rails

Posted at 2020-03-19

こんなメソッド定義してないぞ？と思いきや、
Railsでは真偽値をとるカラムであれば、モデル.カラム名?で真偽値を取得できるらしいです。

>> user = User.first
  User Load (0.1ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
=> #<User id: 1, name: "Example User", email: "example@railstutorial.org", created_at: "2020-03-15 10:30:06", updated_at: "2020-03-15 10:30:06", password_digest: "$2a$10$XvC6suqKbRRIHIm8nQOyjeQcKJixPXdm1b331TQJ7y5...", remember_digest: nil, admin: true, activation_digest: "$2a$10$5/9pDzSQIJdzpaAbFCJZO.qptq0BYtnH.Q/sBwP5epB...", activated: true, activated_at: "2020-03-15 10:30:06">

user.admin?
=>true

user.activate?
=true

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