CakePHP 模型:可包含中的 COUNT(*)

Let's assume I have Posts in one-to-many relationship with Comments. I use Containable to query (for pagination) a list of all Posts and the belonging Comments. But I'm only interested in how many Comments each Post has. I did not found any way to achieve this query with containable without fetching all rows of Comments. I tried:

$this->paginate=array(
            'fields' => 'Post.title, Post.created',
            'contain' => array('Comment'=>'COUNT(*) AS count'),
        );

导致模型评论"与模型计数"错误消息无关.

$this->paginate=array(
            'fields' => array('Post.title, Post.created'),
            'contain' => array('Comment'=>array('fields'=>'COUNT(*) AS count'),
        );

$this->paginate=array(
            'fields' => 'Post.title, Post.created, COUNT(Comment.id)',
            'contain' => array('Comment'=>array('fields'=>''),
        );