ruby-on-rails - rails 4 - 更新用户对象并绕过模型验证

Question

我正在按照 Micahel Hartl 的 Rails 教程构建示例应用程序。我试着探索了一下并添加了一些不同的东西——所以在用户表中我添加了一个 account_balance 列。

问题是 User 模型内置了一堆验证:

validates :name, presence: true, length: { maximum: 50 }
validates :username, presence: true, length: { maximum: 50 }
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(?:\.[a-z\d\-]+)*\.[a-z]+\z/i
validates :email, presence:   true,
                  format:     { with: VALID_EMAIL_REGEX },
                  uniqueness: { case_sensitive: false }
has_secure_password
validates :password, length: { minimum: 6 }

我有另一个函数试图更新account_balance，方法是:

buyer   = User.find(t.buyer_id)
buyer.account_balance -= item_price 
buyer.save

保存失败。当我在 Rails 控制台中运行它时，它返回了以下内容，这对我来说毫无意义:

irb(main):055:0> u = User.first
  User Load (0.5ms)  SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT 1
=> # all the user info here
irb(main):056:0> u.account_balance = 10.00
=> 10.0
irb(main):057:0> u.save
   (0.2ms)  begin transaction
  User Exists (0.3ms)  SELECT 1 AS one FROM "users" WHERE (LOWER("users"."email") = LOWER('test@example.com') AND "users"."id" != 1) LIMIT 1
   (0.1ms)  rollback transaction
=> false

我猜测违反了电子邮件的唯一性约束，但我不知道为什么更新时会发生这种情况？

Answer 1

找到了。只需将 validate: false 传递给保存方法即可。

buyer.save(验证: false)

http://api.rubyonrails.org/classes/ActiveRecord/Validations.html