Rails3 中的 before_create、before_update、before_save、before_destroy 弃用警告 [英] DEPRECATION WARNING in Rails3 for before_create, before_update, before_save, before_destroy

问题描述

我刚刚将我的应用程序从 Rails 2.3 升级到 3 并且我得到了一些我的 before_create、update、save、destroy 等的弃用警告

I just upgraded my application from Rails 2.3 to 3 and I'm getting some DEPRECATION WARNINGS for my before_create ,update, save, destroy etc.

有人知道如何解决这个问题吗?

Does anyone know how ot fix the issue?

这些是我的警告:

DEPRECATION WARNING: Base#before_create has been deprecated, please use Base.before_create :method instead. (called from /Users/macmini/qna/app/models/user.rb:32)
DEPRECATION WARNING: Base#before_update has been deprecated, please use Base.before_update :method instead. (called from /Users/macmini/qna/app/models/user.rb:40)
DEPRECATION WARNING: Base#after_save has been deprecated, please use Base.after_save :method instead. (called from /Users/macmini/qna/app/models/user.rb:50)
DEPRECATION WARNING: Base#before_destroy has been deprecated, please use Base.before_destroy :method instead. (called from /Users/macmini/qna/app/models/user.rb:56)

before_create 的一个例子:

Just one example for the before_create :

  def before_create
    self.username.downcase!
    self.salt = User.make_salt(self.username)
    self.hashed_password = User.hash_with_salt(@password, self.salt)
  end

推荐答案

您看到的警告是 Rails 3 试图阻止您覆盖基础 before_* 和 after_* 方法.这类似于您在控制器中使用 before_filter 和其他回调的方式.

The warning you're seeing is Rails 3's attempt to discourage you from overwriting the base before_* and after_* methods. This is similar to how you would have before_filter and other callbacks in your controller.

这意味着，而不是做:

def before_create
  self.username.downcase!
  self.salt = User.make_salt(self.username)
  self.hashed_password = User.hash_with_salt(@password, self.salt)
end

Rails 想让你做的:

Rails wants you to do:

before_create :downcase_username_and_create_password

def downcase_username_and_create_password
  self.username.downcase!
  self.salt = User.make_salt(self.username)
  self.hashed_password = User.hash_with_salt(@password, self.salt)
end

在这种情况下，您甚至可以将两者分开，因为您可能希望独立生成密码:

In this case, you might even split up the two, as there could be a possibility that you'd want to generate a password independently:

before_create :downcase_username, :create_password

def downcase_username
  self.username.downcase!
end

def create_password
  self.salt = User.make_salt(self.username)
  self.hashed_password = User.hash_with_salt(@password, self.salt)
end

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