Rails 6 - Issue with nested resources in a namespace

Question

So I am trying to nest resources under a namespace, however when i try to navigate to the UserProfile new page I am hitting the following error:

ActionController::RoutingError at /users/xxxxxx/user_profiles/new
uninitialized constant AccountManagementPages::UserProfilesController
Did you mean?  AccountManagementPages::UsersController

This is how the resources are set up in my routes.rb file

  constraints(AccountManagement) do
    namespace :account_management_pages, path: '' do
      root to: 'users#new', as: :registration
      resources :users, except: %w[index], path_names: { new: 'register' } do
        resources :user_profiles
      end
    end
  end

my file structure for both my controller and views are configured correctly (at least I thought they were).

And here is how my views are nested.

This is how I have my user_profiles_controller configured:

module AccountManagementPages
  module Users
    class UserProfilesController < ApplicationController

      def show; end

      def new; end

      def edit; end

      def create; end

      def update; end

    end
  end
end

and my model associations (don't think this is overly relevant here but just incase it is.)

class User < ApplicationRecord has_one :user_profile, dependent: :destroy end

class UserProfile < ApplicationRecord belongs_to :user end

any help here would be greatly appreciated. Not sure why I am hitting this error?

Thanks in advance.

What does "rake routes | grep account_management_pages" say? Nested routes don't require a nester folder structure. A namespace usually does but that can be managed by specifying a path, a controller, etc. — razvans
– razvans, Commented Sep 25, 2020 at 5:27
@razvans it was the controller.. lol.. i do not know how i overlooked naming the controller in the routes file.. lol.. thanks! Ive been staring at that for far too long! — Shawn Wilson
– Shawn Wilson, Commented Sep 25, 2020 at 6:06

jvillian · Accepted Answer · 2020-09-25 06:00:41Z

If you do rails routes, you'll get (amongst other things):

                                 Prefix Verb   URI Pattern                                                        Controller#Action
          account_management_pages_registration GET    /                                                          account_management_pages/users#new
    account_management_pages_user_user_profiles GET    /users/:user_id/user_profiles(.:format)                    account_management_pages/user_profiles#index
                                                POST   /users/:user_id/user_profiles(.:format)                    account_management_pages/user_profiles#create
 new_account_management_pages_user_user_profile GET    /users/:user_id/user_profiles/register(.:format)           account_management_pages/user_profiles#new
edit_account_management_pages_user_user_profile GET    /users/:user_id/user_profiles/:id/edit(.:format)           account_management_pages/user_profiles#edit
     account_management_pages_user_user_profile GET    /users/:user_id/user_profiles/:id(.:format)                account_management_pages/user_profiles#show
                                                PATCH  /users/:user_id/user_profiles/:id(.:format)                account_management_pages/user_profiles#update
                                                PUT    /users/:user_id/user_profiles/:id(.:format)                account_management_pages/user_profiles#update
                                                DELETE /users/:user_id/user_profiles/:id(.:format)                account_management_pages/user_profiles#destroy
                 account_management_pages_users POST   /users(.:format)                                           account_management_pages/users#create
              new_account_management_pages_user GET    /users/register(.:format)                                  account_management_pages/users#new
             edit_account_management_pages_user GET    /users/:id/edit(.:format)                                  account_management_pages/users#edit
                  account_management_pages_user GET    /users/:id(.:format)                                       account_management_pages/users#show
                                                PATCH  /users/:id(.:format)                                       account_management_pages/users#update
                                                PUT    /users/:id(.:format)                                       account_management_pages/users#update
                                                DELETE /users/:id(.:format)                                       account_management_pages/users#destroy

As you can see, user_profiles is not nested under the users namespace. Rails, therefore, is expecting:

module AccountManagementPages
  class UserProfilesController < ApplicationController

    ...

  end
end

If you do:

constraints(AccountManagement) do
  namespace :account_management_pages, path: '' do
    root to: 'users#new', as: :registration
    resources :users, except: %w[index], path_names: { new: 'register' } do
      scope module: :users do 
        resources :user_profiles
      end
    end
  end
end

...and then rails routes, you get (amongst other things):

                                         Prefix Verb   URI Pattern                                                Controller#Action
          account_management_pages_registration GET    /                                                          account_management_pages/users#new
    account_management_pages_user_user_profiles GET    /users/:user_id/user_profiles(.:format)                    account_management_pages/users/user_profiles#index
                                                POST   /users/:user_id/user_profiles(.:format)                    account_management_pages/users/user_profiles#create
 new_account_management_pages_user_user_profile GET    /users/:user_id/user_profiles/register(.:format)           account_management_pages/users/user_profiles#new
edit_account_management_pages_user_user_profile GET    /users/:user_id/user_profiles/:id/edit(.:format)           account_management_pages/users/user_profiles#edit
     account_management_pages_user_user_profile GET    /users/:user_id/user_profiles/:id(.:format)                account_management_pages/users/user_profiles#show
                                                PATCH  /users/:user_id/user_profiles/:id(.:format)                account_management_pages/users/user_profiles#update
                                                PUT    /users/:user_id/user_profiles/:id(.:format)                account_management_pages/users/user_profiles#update
                                                DELETE /users/:user_id/user_profiles/:id(.:format)                account_management_pages/users/user_profiles#destroy
                 account_management_pages_users POST   /users(.:format)                                           account_management_pages/users#create
              new_account_management_pages_user GET    /users/register(.:format)                                  account_management_pages/users#new
             edit_account_management_pages_user GET    /users/:id/edit(.:format)                                  account_management_pages/users#edit
                  account_management_pages_user GET    /users/:id(.:format)                                       account_management_pages/users#show
                                                PATCH  /users/:id(.:format)                                       account_management_pages/users#update
                                                PUT    /users/:id(.:format)                                       account_management_pages/users#update
                                                DELETE /users/:id(.:format)                                       account_management_pages/users#destroy

...and user_profiles will be nested under users. And you should be able to use:

module AccountManagementPages
  module Users
    class UserProfilesController < ApplicationController

      ...

    end
  end
end

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