Rails3中的DEPRECATION WARNING for before_create，before_update，before_save，before_destroy

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.

我刚刚将我的应用程序从Rails 2.3升级到3，我为before_create，update，save，destroy等获得了一些DEPRECATION WARNINGS。

Does anyone know how ot fix the issue?

有谁知道怎么解决这个问题？

These are my Warnings :

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)

Just one example for the before_create :

只是一个before_create的例子：

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

1 个解决方案

#1

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.

你看到的警告是Rails 3试图阻止你覆盖before_ *和after_ *方法。这与您在控制器中使用before_filter和其他回调的方式类似。

What this means is that instead of doing:

这意味着不是做：

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 wants you to do:

Rails希望你这样做：

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

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:

在这种情况下，您甚至可能将两者分开，因为您可能希望独立生成密码：

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

#1