xm.item do
  xm.title "#{h(post.respond_to?(:topic_title) ? post.topic_title : post.topic.title)}"
  xm.description post.body_html
  xm.pubDate post.created_at.rfc822
  xm.guid [request.host_with_port, post.forum_id.to_s, post.topic_id.to_s, post.id.to_s].join(":"), "isPermaLink" => "false"
  xm.author "#{h(post.user.display_name)}"
  xm.link topic_url(post.forum_id, post.topic_id)
end