Yii中CActiveRecord有relation的時候分頁

假如有一個User表，一個Post表,User表中關係如下

public function relations()
    {
        return array(
            'posts' => array(self::HAS_MANY, 'Post', 'author_id');
        );
    }

當我們用直接用CGridView進行分頁展示的時候發現當前頁的條數竟然是以post的數目爲標準而不是user的 ,假定每頁5條可能展示的不足5條，Post的數量總和爲5條。同樣的情況也會出現在CActiveRecord::findAll 中。這個時候CDbCriteria中該如下定義

 // query criteria
    $criteria = new CDbCriteria();
    // force to join Post (without selecting)
    $criteria->with = array(
        'posts' => array(
            'together' => true,
            'select' => false,
        ),
    );
    // compare title
    $criteria->compare('posts.title', $searchWord, true);
    // group by Author's id
    $criteria->group = 't.id';
    // order by author name
    $criteria->order = 't.name ASC';
    // limit to 5 authors
    $criteria->limit = 5;
    // find all authors
    $authors = User::model()->findAll($criteria);