改善这种混合

时间:2016-07-18 18:16:45

标签: ruby ruby-on-rails-3 mixins

我正在尝试改进这个mixin并且困扰我的一件事是我似乎无法让其他模块知道self.included(base)中的基本属性所以我有将base传递给每个模块方法。有没有更好的方法:

module SearchSort
      def self.included(base)
        # binds included class's class methods
        base.send :extend, ClassMethods
        initialize_scopes(base)
      end

      def self.initialize_scopes(base)
        initialize_type_scope(base)
        initialize_product_name_scope(base)
      end

      def self.initialize_type_scope(base)
        base.scope :for_work_type, lambda { |work_type|
        Rails.logger.debug("-----(45) work_type #{work_type}")
        terms = process_terms(work_type)
      base.where(
        terms.map { '(LOWER(workable_type) LIKE ?)' }.join(' AND '),
        *terms.map { |e| [e] * 1 }.flatten)
    }
  end

  def self.initialize_product_name_scope(base)
    base.scope :for_product_name, lambda { |product_name|
      terms = process_terms(product_name)
      base.where(
        terms.map { '(LOWER(products.name) LIKE ?)' }.join(' AND '),
        *terms.map { |e| [e] * 1 }.flatten
      ).joins(:product)
    }
  end

  module ClassMethods
    def pid_opts
      [%w(Newly\ Added newly_added), %w(Waiting waiting),
       %w(Ready ready), %w(Working working),
       %w(Error error), %w('Error Retry', 'error_retry'),
       %w(Done done), %w(Gated gated)
      ]
    end
  end
end

1 个答案:

答案 0 :(得分:0)

included方法中使用自动注册魔术,我只是在模块中添加初始化方法,如initialize_scopes,并使用该模块从类扩展的地方调用

extend SearchSort
initialize_scopes

因为使用了extend,所以模块中定义的方法在类上下文中执行(它都是关于self的上下文)。

举个例子,我将这种模式用于acts_as_api

module ApiHandling
  def expose_api(*fields)
    acts_as_api

    api_accessible :ios_v1 do |template|
      fields.each { |field| template.add field }
    end
  end
end

像这样使用:

class Event < ActiveRecord::Base
  extend ApiHandling
  expose_api :id, :name, :description, ...