从实例方法中访问ActiveSupport :: Concern类方法

Question

我正在通过迈克尔哈特的教程,但发现用户类有点混乱.我想通过将大块功能拉入单独的mixins(使用new-ish ActiveSupport::Concern,vs旧self.included(klass)模式)来清理它.

我在Session部分遇到了一些麻烦.

来自'models/user/session_management.rb':

require 'active_support/concern'

module SessionManagement
  extend ActiveSupport::Concern

  included do
    before_create :create_remember_token
  end

  private
      def create_remember_token
        self.remember_token = self.encrypt(self.new_remember_token)
      end

  module ClassMethods
   def new_remember_token
      SecureRandom.urlsafe_base64
    end

    def encrypt(token)
      Digest::SHA1.hexdigest(token.to_s)
    end
  end
end

我在'models/user.rb'中包含哪些内容:

require 'user/authentication'
require 'user/session_management'

class User < ActiveRecord::Base
  ...

  include Authentication
  include SessionManagement

  ...

end

这适用于身份验证模块(这实际上只是验证和has_secure_password).但是,create_remember_token实例方法试图访问encrypt和new_remember_token类方法.

NoMethodError:
  undefined method `new_remember_token' for #<User:0x007f8e17e338f0>
  # ./app/models/user/session_management.rb:13:in 'create_remember_token'
  # ./spec/models/user_spec.rb:152:in `block (4 levels) in <top (required)>

我觉得我错过了一些明显的东西.任何见解将不胜感激.提前致谢!

Answer 1

这两个方法是类方法,您在实例上调用它们.尝试:

def create_remember_token
  self.remember_token = self.class.encrypt(self.class.new_remember_token)
end

或(首选)将它们移出ClassMethods模块.

require 'active_support/concern'

module SessionManagement
  extend ActiveSupport::Concern

  included do
    before_create :create_remember_token
  end

  private
    def create_remember_token
      self.remember_token = encrypt(new_remember_token)
    end

    def new_remember_token
      SecureRandom.urlsafe_base64
    end

   def encrypt(token)
     Digest::SHA1.hexdigest(token.to_s)
   end

end