add_method_to_attributes!

# File actionview/lib/action_view/helpers/url_helper.rb, line 596
        def add_method_to_attributes!(html_options, method)
          if method_not_get_method?(method) && html_options["rel"] !~ /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