routes_for_controller_and_action_and_keys

# File actionpack/lib/action_controller/routing/route_set.rb, line 421
      def routes_for_controller_and_action_and_keys(controller, action, keys)
        selected = routes.select do |route|
          route.matches_controller_and_action? controller, action
        end
        selected.sort_by do |route|
          (keys - route.significant_keys).length
        end
      end