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

Question

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

有谁知道怎么解决这个问题？

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)

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

Answer 1

你看到的警告是Rails 3试图阻止你覆盖基础before_*和after_*方法.这类似于before_filter控制器中的操作和其他回调.

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

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