Path for nested resources

I have a nested resources but i am not get a path for these resources.

routes.rb

namespace :admin do
   resources :demos do
      resources :demojobs, :path => "jobs" do
        resources :demotutorials 
      end  
    end
end

I have try to get the new page of demotutorials page using following link:

new_admin_demo_demojob_demotutorials_path

but getting error

No route matches {:action=>"new", :controller=>"admin/demotutorials"}

working with rails version : 3.2.11