保存originator_id，活動源從零開始

Question

我目前正在關注Ryan Bates教程activity feed from scratch。

**我向數據庫添加了一個originator_id，以便我可以保存發起該帖子的所有者的ID。但由於某種原因，我無法讓它工作。

我從頭

class CreateActivities < ActiveRecord::Migration 
    def change 
    create_table :activities do |t| 
     t.belongs_to :user 
     t.string :action 
     t.belongs_to :trackable 
     t.string :trackable_type 

     ###I want to save the id corresponding to User who created the object 
     t.belongs_to :originator 
     t.string :originator_type 

     t.timestamps 
    end 
    add_index :activities, :user_id 
    add_index :activities, :trackable_id 
    add_index :activities, :originator_id 
    end 
end 

這裏數據庫是我的代碼

模型

class Activity < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :trackable, polymorphic: true 

    belongs_to : originator, polymorphic: true 
    attr_accessible :action, :recipient, :trackable 


    ###how can i set the originator_id value 

    after_create :set_originator 

    def set_originator 
     self.originator.update_attribute(:originator, ???) 
    end 
end 

控制器

class ApplicationController < ActionController::Base 

    ###sets the action and trackable values 
    ###how can i the originator here. i keep getting an error saying undefined method 
    ###why is it that rails recognizes trackable? 

    def track_activity(trackable, action = params[:action]) 
    current_user.activities.create! action: action, trackable: trackable, 
    originator: originator 
    end 

end 

class LikesController < ApplicationController 

    def create 
    @like = Like.create(params[:like]) 
    @dailypost = @like.dailypost 

    ###Used to call track activity method above 
    track_activity @like 
    respond_to do |format| 
     format.js 
     format.html { redirect_to :back } 
    end 
    end 

末

Answer 1

不知道這個答案會有多穩固，因爲我爲活動添加了更多模型，但是這對我喜歡的模型有效。

如果任何人都可以提供另一種解決方案，將與多個模型，我真的很感激它。 :)

class ApplicationController < ActionController::Base 

    def track_activity(trackable, action = params[:action]) 
    current_user.activities.create! action: action, trackable: trackable, 
    originator: originator 
    end 

    def originator 
    @like.dailypost.user 
    end 

end