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我已经使用 has_many :through 建立了一个自我引用关联，基本上如该 Railscast 中所述：http ://railscasts.com/episodes/163-self-referential-association 。

一些“活动”的行为有点像“文章”，并且有一组相关的其他活动，因此连接表的命名。这有点令人困惑......我知道。

我很难让事情正确保存。这是我所拥有的...

活动.rb

class Activity < ActiveRecord::Base
  has_many :article_activities
  has_many :activities, :through => :article_activities
  accepts_nested_attributes_for :activities
end

article_activity.rb

class ArticleActivity < ActiveRecord::Base
  attr_accessible :article_id, :activity_id
  belongs_to :activity
  belongs_to :article, :class_name => "Activity"
end

文章控制器.rb

class ArticlesController < ApplicationController

  def new
    @activity = Activity.new
    @activity.is_article = true
    @user_activities = current_user.activities
  end

  def create
    @activity = Activity.new params[:activity]
    @activity.is_article = true
    @activity.user = current_user

    if @activity.save
      redirect_to root_path, :notice => "Article created!"
    else
      render :action => "new"
    end
  end

新的.html.haml 

= simple_form_for @activity, :url => articles_path do |f|
  / Other fields omitted for clarity
  = f.association :activities, :collection => @user_activities

因此，在提交表单后，@activityactioncreate中有预期的@activity.activities. 但是，在保存@activity并重新加载记录时， @activity.activities它是空的。

任何想法如何保存关联？

4

1 回答 1

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我想出了这个。我必须为模型添加一个 :foreign_key 的“文章”...

class ArticleActivity < ActiveRecord::Base
  attr_accessible :article_id, :activity_id
  belongs_to :activity
  belongs_to :article, :class_name => "Activity", :foreign_key => "article_id"
end

class Activity < ActiveRecord::Base
  belongs_to :user
  has_many :article_activities, :foreign_key => "article_id"
  has_many :activities, :through => :article_activities 
end
于 2013-01-11T16:50:19.980 回答