class ActionDispatch::Routing::Mapper

def devise_registration(mapping, controllers) #:nodoc:
  path_names = {
    new: mapping.path_names[:sign_up],
    edit: mapping.path_names[:edit],
    cancel: mapping.path_names[:cancel]
  }
  options = {
    only: [:new, :create, :edit, :update, :destroy],
    path: mapping.path_names[:registration],
    path_names: path_names,
    controller: controllers[:registrations]
  }
  resource :registration, options do
    get :cancel
  end
end