從模塊的實例方法中調用一個類方法mixin（rails）

Question

好奇如何從一個活動記錄類包含的模塊的實例方法中調用一個類方法。例如，我希望用戶和客戶端模型共享密碼加密的細節和螺栓。

# 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 

但是，這失敗了。說實例方法調用它時找不到類方法。我可以調用 User.encrypt_password（ '密碼'） 但 User.authenticate（ '密碼'）未能查找方法用戶＃ENCRYPT_PASSWORD

有什麼想法？

Answer 1

您需要ENCRYPT_PASSWORD就像一個類的方法

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