Ruby on rails 如何使用concern访问实例方法中的类方法（或变量）？

我需要访问关注点内实例方法中的类方法（在ClassMethods中定义）

我的大脑被融化了，我确信这是我做错的一件简单的事情

我需要访问

compariable\u opts

内部

comparison

。我怎么做

下面是一些片段：

关心

# app/models/concerns/compare.rb
module Compare
  extend ActiveSupport::Concern

  attr_accessor :comparable_opts 

  module ClassMethods
    attr_reader :arguable_opts

    def comparable_opts
      @@comparable_opts
    end

    private
      def default_opts
        @default_opts ||= {fields: [:answers_count, 
                                      :answers_correct_count, 
                                      :answers_correct_rate, 
                                      :users_count]}
      end

      def compare(opts={})
        @comparable_opts = default_opts.merge(opts)
      end
  end

  def comparison
  end
end

模型

#app/models/mock_alternative.rb
类MockAlternative

解决方案： 我刚刚在我的方法

compare

中使用了

cattr\u访问器。谢谢大家

module Compare
  extend ActiveSupport::Concern


  module ClassMethods
    attr_reader :arguable_opts

    def comparison_klass
      "ActiveRecord::#{comparable_opts[:with].to_s.classify}".constantize
    end

    private
      def default_opts
        @default_opts ||= {fields: [:answers_count, 
                                      :answers_correct_count, 
                                      :answers_correct_rate, 
                                      :users_count]}
      end

      def compare(opts={})
        cattr_accessor :comparable_opts
        self.comparable_opts = default_opts.merge(opts)
      end
  end

  def comparison
    comparable_opts
  end
end

module Compare
  extend ActiveSupport::Concern


  module ClassMethods
    attr_reader :arguable_opts

    def comparison_klass
      "ActiveRecord::#{comparable_opts[:with].to_s.classify}".constantize
    end

    private
      def default_opts
        @default_opts ||= {fields: [:answers_count, 
                                      :answers_correct_count, 
                                      :answers_correct_rate, 
                                      :users_count]}
      end

      def compare(opts={})
        cattr_accessor :comparable_opts
        self.comparable_opts = default_opts.merge(opts)
      end
  end

  def comparison
    comparable_opts
  end
end