Yii的Relational Active Record三张表连接查询

public function relations(){
    return array(
        ‘entitystags‘=>array(self::HAS_MANY, ‘EntityStag‘, ‘eid‘, ‘alias‘=>‘estag‘, ‘select‘=>‘*‘),
        ‘tags‘=>array(self::HAS_MANY, ‘Stag‘, ‘‘ , ‘alias‘=>‘stag‘ ,‘on‘=>‘estag.tid=stag.id‘ , ‘select‘=>‘title,id‘),
    );
}

$model=Book::model()->with("entitystags" , "tags")->findByPk($id);