polymorphic_url (ActionController::PolymorphicRoutes)

    # File lib/action_controller/polymorphic_routes.rb, line 71
        def polymorphic_url(record_or_hash_or_array, options = {})
          if record_or_hash_or_array.kind_of?(Array)
            record_or_hash_or_array = record_or_hash_or_array.dup
          end

          record    = extract_record(record_or_hash_or_array)
          format    = extract_format(record_or_hash_or_array, options)
          namespace = extract_namespace(record_or_hash_or_array)

          args = case record_or_hash_or_array
            when Hash;  [ record_or_hash_or_array ]
            when Array; record_or_hash_or_array.dup
            else        [ record_or_hash_or_array ]
          end

          args << format if format

          inflection =
            case
            when options[:action].to_s == "new"
              args.pop
              :singular
            when record.respond_to?(:new_record?) && record.new_record?
              args.pop
              :plural
            else
              :singular
            end

          named_route = build_named_route_call(record_or_hash_or_array, namespace, inflection, options)
          send!(named_route, *args)
        end