多态控制器和调用对象 [英] Polymorphic controller and calling object

问题描述

我与地址具有多态关系，地址既可以由成员也可以由属拥有.一切看起来都很不错，直到我意识到除非丢失某些东西，否则我不知道会创建哪种类型的对象.有没有办法告诉路由文件包含对象的类型?

I have a polymorphic relationship with address being able to both be owned by a member or a dependent. Everything looked great until I realized that I wouldn't know what type of object was creating it unless I'm missing something. Is there a way to tell the routing file to include the type of object?

型号:

 class Member < ActiveRecord::Base
   has_one :address, as: :person, dependent: :destroy
 end

 class Dependent < ActiveRecord::Base
   has_one :address, as: :person, dependent: :destroy
 end

 class Address < ActiveRecord::Base
    belongs_to :person, polymorphic: true
 end

控制器:

 def new
  @person = ???
  @address = Address.new(person: @person)
 end

当前路线:

  resources :members do
    resources :addresses, shallow: true
    resources :dependents, shallow: true do
      resources :addresses, shallow: true
    end
  end

我在每个路由下都有要解决的路由，但是我认为需要检查params [:member_id]或params [:dependent_id].当我在所有内容上加上笔记时会发生什么.我可能会错过在Rails中执行此操作的一些简单方法，我们将不胜感激任何建议！

I have routes to address under each but would need to check for params[:member_id] or params[:dependent_id] I think. What happens when I attach notes to everything. I'm probably missing some easy way to do this in Rails, any advice would be greatly appreciated!

推荐答案

基本上，您想在创建地址之前设置人员对象.您可以在地址控制器中执行以下操作:

Basically you want to set the person object before creating a address. You can do this in your address controller like this:

在您的地址控制器中:

class AddressesController < ApplicationController  
  before_action :set_person

  def new
    @address = @person.build_address
  end

  def set_person
    klass = [Member, Dependent].detect{|c| params["#{c.name.underscore}_id"]}
    @person= klass.find(params["#{klass.name.underscore}_id"])
  end
end

对于您的路由文件，当前根据您在模型中定义的关系，以下应该适用:

As for your routes file, currently according to the relationships that you have defined in your models the following should work:

resources :members do
 resource :address #singular resource routing as its a has_one relationship
end

resources :dependents do
  resource :address #singular resource routing as its a has_one relationship
end

(请注意，我已经对嵌套资源使用了单数路由.您可以在此处阅读更多信息:

(Notice that I have used singular routing for nested resource. You can read more on it here : http://guides.rubyonrails.org/routing.html#singular-resources)

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