路线关注和多态模型:如何共享控制器和视图? [英] Route concern and polymorphic model: how to share controller and views?

问题描述

给出路​​线:

Example::Application.routes.draw do
  concern :commentable do
    resources :comments
  end

  resources :articles, concerns: :commentable

  resources :forums do
    resources :forum_topics, concerns: :commentable
  end
end

和模型:

class Comment < ActiveRecord::Base
  belongs_to :commentable, polymorphic: true
end

当我编辑或添加评论时，我需要回到"commentable"对象.但是，我有以下问题:

When I edit or add a comment, I need to go back to the "commentable" object. I have the following issues, though:

1)comments_controller.rb中的redirect_to取决于父对象

1) The redirect_to in the comments_controller.rb would be different depending on the parent object

2)视图上的引用也会有所不同

2) The references on the views would differ as well

= simple_form_for comment do |form|

是否存在一种实用的方法来共享此comment资源的视图和控制器?

Is there a practical way to share views and controllers for this comment resource?

推荐答案

您可以在before过滤器中找到父对象，如下所示:

You can find the parent in a before filter like this:

comments_controller.rb

before_filter: find_parent

def find_parent
  params.each do |name, value|
    if name =~ /(.+)_id$/
      @parent = $1.classify.constantize.find(value)
    end
  end
end

现在，根据父类型，您可以重定向或执行任何您想做的事情.

Now you can redirect or do whatever you please depending on the parent type.

例如在视图中:

= simple_form_for [@parent, comment] do |form|

或者在控制器中

comments_controller.rb

redirect_to @parent # redirect to the show page of the commentable.

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