    # File lib/action_view/helpers/record_tag_helper.rb, line 50
          def content_tag_for(tag_name, record, *args, &block)
            prefix  = args.first.is_a?(Hash) ? nil : args.shift
            options = args.extract_options!
            options.merge!({ :class => "#{dom_class(record)} #{options[:class]}".strip, :id => dom_id(record, prefix) })
            content_tag(tag_name, options, &block)
          end