# File lib/action_view/helpers/record_tag_helper.rb, line 55
      def content_tag_for(tag_name, record, prefix = nil, options = nil, &block)
        options, prefix = prefix, nil if prefix.is_a?(Hash)
        options ||= {}
        options.merge!({ :class => "#{dom_class(record, prefix)} #{options[:class]}".strip, :id => dom_id(record, prefix) })
        content_tag(tag_name, options, &block)
      end