ruby-on-rails – Ruby on Rails中的最新活动

我们最近在项目上做了一个活动流.这是我们如何建模它

Class Activity
   belongs_to :user_activities # all the people that cares about the activity
   belongs_to :actor,class_name='user' # the actor that cause the activity

   belongs_to :target,:polymorphic => true # the activity target(e.g. if you vote an answer,the target can be the answer )
   belongs_to :subtarget,:polymorphic => true # the  we added this later since we feel the need for a secondary target,e.g if you rate an answer,target is your answer,secondary target is your rating. 

   def self.add(actor,activity_type,target,subtarget = nil)
     activity = Activity.new(:actor => actor,:activity_type => activity_type,:target => target,:subtarget => subtarget)
     activity.save!
     activity
   end 
end

在我们做的answer_controller中

Class AnswersController
    def create
        ...
        Activity.add(current_user,ActivityType::QUESTION_ANSWERED,@answer)
        ...
    end
end

要从我们这样做的用户处获取最近的活动列表

@activities = @user.activities