ruby-on-rails - 从模块mixin（rails）的实例方法内部调用类方法

Question

好奇如何从活动记录类包含的模块的实例方法内部调用类方法。例如，我希望用户模型和客户端模型共享密码加密的细节。

# app/models
class User < ActiveRecord::Base
  include Encrypt
end
class Client < ActiveRecord::Base
  include Encrypt
end

# app/models/shared/encrypt.rb
module Encrypt
  def authenticate
    # I want to call the ClassMethods#encrypt_password method when @user.authenticate is run 
    self.password_crypted == self.encrypt_password(self.password) 
  end
  def self.included(base)
    base.extend ClassMethods
  end  
  module ClassMethods
    def encrypt_password(password)
     Digest::SHA1.hexdigest(password)
    end
  end
end  

然而，这失败了。表示实例方法调用时找不到类方法。我可以调用 User.encrypt_password('password') 但 User.authenticate('password') 无法查找方法 User#encrypt_password

有什么想法吗？

Answer 1

您需要 encrypt_password 就像类方法一样

module Encrypt
  def authenticate
    # I want to call the ClassMethods#encrypt_password method when @user.authenticate is run 
    self.password_crypted == self.class.encrypt_password(self.password) 
  end
  def self.included(base)
    base.extend ClassMethods
  end  
  module ClassMethods
    def encrypt_password(password)
     Digest::SHA1.hexdigest(password)
    end
  end
end