polymorphic_url (ActionController::PolymorphicRoutes)

    # File lib/action_controller/polymorphic_routes.rb, line 74
        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.compact
            record_or_hash_or_array = record_or_hash_or_array[0] if record_or_hash_or_array.size == 1
          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

          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

          args.delete_if {|arg| arg.is_a?(Symbol) || arg.is_a?(String)}
          args << format if format

          named_route = build_named_route_call(record_or_hash_or_array, namespace, inflection, options)

          url_options = options.except(:action, :routing_type, :format)
          unless url_options.empty?
            args.last.kind_of?(Hash) ? args.last.merge!(url_options) : args << url_options
          end

          __send__(named_route, *args)
        end