How do I remove the Devise route to sign up?

Question

I\'m using Devise in a Rails 3 app, but in this case, a user must be created by an existing user, who determines what permissions he/she will have.

Because of this, I

Answer 1

I liked @max's answer, but when trying to use it I ran into an error due to devise_mapping being nil.

I modified his solution slightly to one that seems to address the issue. It required wrapping the call to resource inside devise_scope.

devise_for :users, skip: [:registrations]

devise_scope :user do
  resource :users,
           only: [:edit, :update, :destroy],
           controller: 'devise/registrations',
           as: :user_registration do
    get 'cancel'
  end
end

Note that devise_scope expects the singular :user whereas resource expects the plural :users.