ruby-on-rails - 简化模型中的代码

Question

我有 3 个模型和多态关系。 帖子:

#models/post.rb

class Post < ActiveRecord::Base

   after_create :create_vote

   has_one :vote, :dependent => :destroy, :as => :votable

   protected
     def create_vote
        self.vote = Vote.create(:score => 0)
     end
end

评论:

#models/comment.rb

class Comment < ActiveRecord::Base

  after_create :create_vote

  has_one :vote, :dependent => :destroy, :as => :votable

  protected
    def create_vote
      self.vote = Vote.create(:score => 0)
    end
end

投票(多态)

#models/vote.rb
class Vote < ActiveRecord::Base
 belongs_to :votable, :polymorphic => true
end

正如你所看到的，我有相同的回调。怎么比较容易呢？如果我制作一个带有回调的模块，这是正确的吗？

Answer 1

是的，您可以定义一个包含相同可重复方法的模块，但是当包含该模块时，您还必须定义所有 ActiveRecord 宏。

它可能看起来像这样:

module VoteContainer
  def self.included(base)
    base.module_eval {
      after_create :create_vote
      has_one :vote, :dependent => :destroy, :as => :votable
    }
  end

  protected
  def create_vote
    self.vote = Vote.create(:score => 0)
  end
end

class Comment < ActiveRecord::Base
  include VoteContainer
end