Question

我需要在关注点内的实例方法中访问类方法（在ClassMethods中定义）。

我的大脑融化了，我确信这是一件很简单的事情，我做错了。

我需要访问comparable_opts内的comparison。我该怎么办？

按照以下网址摘要：

关注

# 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
class MockAlternative < ActiveRecord::Base
  include Compare

  belongs_to :mock, primary_key: :mock_id, foreign_key: :mock_id

  compare fields: [:answers_count, :question_answers_count, :question_answers_rate],
          with: :mock_aternative_school

  def question_answers_rate
    self[:answers_count].to_f/self[:question_answers_count].to_f
  end
end

Answer 1

<强>解决方案：我在我的方法cattr_accessor中使用了compare。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

如何使用关注点访问实例方法中的类方法（或变量）？

1 个答案: