thinkphp5.1模型关联个field一起使用

$topics = MForum::field(\'id,title,time,reply,view,settop,choice,praise\')->withJoin([\'forumcate\' => [ \'id\',\'name\'],\'aliasofuser\' => [\'id\',\'username\',\'userhead\']])->where(\'open\', 1)->order(\'settop desc,id desc\')->paginate(1);