嵌套控制器中未初始化的常量错误

Question

我收到此错误:

Routing Error
uninitialized constant RegistrationsController

这是我的日志:

Started GET "/registrants/1/registrations/new" for 127.0.0.1 at 2012-07-03 00:55:44 -0500

ActionController::RoutingError (uninitialized constant RegistrationsController):

Rendered /.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.1.3/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (8.5ms)

这是我的routes.rb的一部分是合适的:

registrant_registrations GET    /registrants/:registrant_id/registrations(.:format)          {:action=>"index", :controller=>"registrations"}
                                   POST   /registrants/:registrant_id/registrations(.:format)          {:action=>"create", :controller=>"registrations"}
       new_registrant_registration GET    /registrants/:registrant_id/registrations/new(.:format)      {:action=>"new", :controller=>"registrations"}
      edit_registrant_registration GET    /registrants/:registrant_id/registrations/:id/edit(.:format) {:action=>"edit", :controller=>"registrations"}
           registrant_registration GET    /registrants/:registrant_id/registrations/:id(.:format)      {:action=>"show", :controller=>"registrations"}
                                   PUT    /registrants/:registrant_id/registrations/:id(.:format)      {:action=>"update", :controller=>"registrations"}

这是我的注册控制器,位于/app/controllers/portal/registrations_controller.rb:

class Portal::RegistrationsController < ApplicationController
  def create
        @registrant = current_member.registrants.find(params[:registrant])
        @registration = @registrant.registrations.build

        respond_to do |format|
          if @registration.save
            format.html {   redirect_to root_path, :notice => "Registration successfully created!" }
            format.json { head :ok }
          else
           format.html { redirect_to root_path, :notice => "There was a problem with the registration." }
          end
        end     
  end

end

当我new_registrant_registration_path(registrant)从一个视图中调用时,我收到此错误Portal#index.

编辑:

为了完整性,在找到解决方案之前,这里是我的routes.rb文件.Radar提到了我发布的要点,但我想我会把代码放在这里以防gist被删除.

MyApp::Application.routes.draw do

  match 'admin' => 'admin/dashboard#index', :as => :admin_root
  match 'portal' => 'portal#index', :as => :member_root

  namespace 'admin' do
    match 'profile' => 'profile#show', :as => :profile

    resources :members
    resources :admins
        resources :packages
        resources :products
        resources :levels
        resources :lessons
        resources :registrations
        resources :registrants, :controller => 'customers/registrants'
        resources :locations
        resources :schools
        resources :terms
        resources :customers
        resources :invoices
        resources :payments
  end

  namespace 'member' do
    resources :registrations
  end

  match 'register' => 'member/registrations#new', :as => :signup  
  match 'login' => 'member_sessions#new', :as => :login
  match 'logout' => 'member_sessions#destroy', :as => :logout  
  match 'admin/login' => 'admin_sessions#new', :as => :admin_login
  match 'admin/logout' => 'admin_sessions#destroy', :as => :admin_logout

  match 'member/activate/:activation_code' => 'member/activations#create', :as => :member_activation
  match 'member/:id/activate/resend' => 'member/activations#resend', :as => :resend_member_activation
  match 'member/:id/activate' => 'member/activations#new', :as => :new_member_activation

  match 'member/password/reset/begin' => 'member/password_resets#new', :as => :new_member_password_reset, :via => :get
  match 'member/password/reset' => 'member/password_resets#create', :as => :member_password_resets, :via => :post
  match 'member/password/:token/finish' => 'member/password_resets#edit', :as => :edit_member_password_reset, :via => :get
  match 'member/password/reset' => 'member/password_resets#update', :as => :member_password_reset, :via => :put

  match 'admin/packages/new/:partial' => 'admin/packages#new'

  resources :admins

  resources :registrants, :controller => 'portal/registrants' do
    resources :registrations
  end

  resource :admin_session
  resource :member_session

  root :to => 'portal#index'

end

Answer 1

为了说清楚:marcamillion进入#rubyonrails和Freenode并分享他的config/routes.rb.这就是我弄清楚他正在制造的错误然后想出答案的地方.

两件事情.

第一:管理员根路由

而不是admin像这样定义命名空间的根路由:

match 'admin' => 'admin/dashboard#index', :as => :admin_root

在namespace :admin调用中定义它,如下所示:

namespace 'admin' do
  root :to => "dashboard#index"
end

这将自动将其定义为admin_root_path和admin_root_url,因此您不需要这样做,它将自动为控制器添加admin/前缀前缀,因此您也不需要这样做.

第二:引用RegistrantsController

你现在有这个config/routes.rb:

resources :registrants, :controller => 'portal/registrants' do
  resources :registrations
end

这将做的是定义资源路由以registrants正确使用Portal::RegistrantsController,但不会在此下面定义嵌套路由Portal::RegistrationsController.它会做什么尝试使用RegistrationsController,这就是你得到这个错误的原因.

要解决这个问题,我建议你使用这个scope方法,如下所示:

scope :module => Portal do
 resources :registrants do
  resources :registrations
 end
end

该scope方法,以这种方式使用的时候,会告诉Rails,对于块内的路由控制器下Portal的命名空间.这意味着它会知道resources :registrants是Portal::Registrants那resources :registrations是Portal::Registrations,由此固定,你看到的错误.