heartcombo--devise/lib/devise/strategies/base.rb

module Devise
  module Strategies
    # Base strategy for Devise. Responsible for verifying correct scope and mapping.
    class Base < ::Warden::Strategies::Base
      # Checks if a valid scope was given for devise and find mapping based on this scope.
      def mapping
        @mapping ||= begin
          mapping = Devise.mappings[scope]
          raise "Could not find mapping for #{scope}" unless mapping
          mapping
        end
      end
    end
  end
end