cakephp：使用计数器缓存进行排序

我有两个模型

下面的模型描述了它们之间的关系

class DebatePost extends AppModel {
var $name = 'DebatePost';
var $hasMany = array(
        'DebateComment' => array(
        'className' => 'DebateComment',
        'foreignKey' => 'debate_id',                
        'dependent'=> true,

        )
    ); 
 }


class DebateComment extends AppModel {
var $name = 'DebateComment';
var $belongsTo = array(
    'DebatePost' => array(
        'className'     => 'DebatePost',
        'foreignKey'    => 'debate_id',
        'dependent' => true,
        'counterCache' => 'no_of_comments'
    )
 ); 
}

我在辩论帖子表中创建了“无评论”字段

及 在DebatPost控制器中

$arrde = $this->DebatePost->find('all',array('order'=>'debat_posts.no_of_comments DESC'));

我遵循上面的第二步，通过使用countercache，find Difference_发布数据orderby no of comments in Difference_comments，但没有得到任何结果

'order'=>'DebatePost.no_of_comments DESC'