Rails3 Engine -- Controller scoped inside engine module returning load error by client app

I just created my first engine. It adds a couple of new routes like so:

Rails.application.routes.draw do
  scope :module => 'contact' do
    get "contact", :to => 'contacts#new'
    get "contact/send_email", :to => 'contacts#send_email', :as => 'send_email'
  end
end

Then, in /websites/Engines/contact/app/controllers/contacts_controller.rb, I have:

module Contact
  class ContactsController < ApplicationController

    # Unloadable marks your class for reloading between requests
    unloadable

    def new
      @contact_form = Contact::Form.new
    end

    def send_email
      @contact_form = Contact::Form.new(params[:contact_form])

      if @contact_form.valid?
        Notifications.contact(@contact_form).deliver
        redirect_to :back, :notice => 'Thank you! Your email has been sent.'
      else
        render :new
      end
    end
  end
end

I loaded it up in the client app's console to prove to my开发者_C百科self some basics were working and quickly got this load error (which I then confirmed by reproducing the issue in a browser):

ruby-1.8.7-p302 > Contact::Form.new
 => #<Contact::Form:0x2195b70> 
ruby-1.8.7-p302 > app.contact_path
 => "/contact" 
ruby-1.8.7-p302 > r = Rails.application.routes; r.recognize_path(app.contact_path)
LoadError: Expected /websites/Engines/contact/app/controllers/contacts_controller.rb to define ContactsController

And there you have it; /contact gets to the engine's contacts_controller.rb but the fact the controller is inside the module Contact makes it unrecognizable.

What am I doing wrong?

Your app/controllers/contacts_controller.rb is actually defining the Contact::ContactsController, not the ContactsController that Rails expects.

The problem is with your routes, they should be defined like this:

Rails.application.routes.draw do
  scope :module => 'contact' do
    get "contact", :to => 'contact/contacts#new'
    get "contact/send_email", :to => 'contact/contacts#send_email', :as => 'send_email'
  end
end

Thanks to @ryan-bigg and @nathanvda their answers in conjunction fixed this issue for me. In short, I ended up using the following routes:

Rails.application.routes.draw do
  scope :module => 'contact' do
    get  "contact", :to => 'contacts#new'
    post "contact/send_email", :to => 'contacts#send_email', :as => 'send_email'
  end
end

with the following controller:

module Contact
  class ContactsController < ApplicationController

    def new
      @contact_form = Contact::Form.new
    end

    def send_email
      @contact_form = Contact::Form.new(params[:contact_form])

      if @contact_form.valid?
        Contact::Mailer.contact_us(@contact_form).deliver
        redirect_to :back, :notice => 'Thank you! Your email has been sent.'
      else
        render :new
      end
    end

  end
end

but what seemed to be the final piece was @nathanvda's suggestions to move the contacts_controller from:

/app/controllers/contacts_controller.rb

to

/app/controllers/contact/contacts_controller.rb

Thank you both for your help!