build_named_route_call

# File actionpack/lib/action_controller/polymorphic_routes.rb, line 155
      def build_named_route_call(records, inflection, options = {})
        unless records.is_a?(Array)
          record = extract_record(records)
          route  = ''
        else
          record = records.pop
          route = records.inject("") do |string, parent|
            if parent.is_a?(Symbol) || parent.is_a?(String)
              string << "#{parent}_"
            else
              string << RecordIdentifier.__send__("plural_class_name", parent).singularize
              string << "_"
            end
          end
        end

        if record.is_a?(Symbol) || record.is_a?(String)
          route << "#{record}_"
        else
          route << RecordIdentifier.__send__("plural_class_name", record)
          route = route.singularize if inflection == :singular
          route << "_"
        end

        action_prefix(options) + route + routing_type(options).to_s
      end