instance method add_method_to_attributes!

# File actionview/lib/action_view/helpers/navigation_helper.rb, line 551
        def add_method_to_attributes!(html_options, method)
          if method_not_get_method?(method) && !html_options["rel"].to_s.include?("nofollow")
            if html_options["rel"].blank?
              html_options["rel"] = "nofollow"
            else
              html_options["rel"] = "#{html_options["rel"]} nofollow"
            end
          end
          html_options["data-method"] = method
        end