得到父母有一些标准的物品 - Yii

I have an object Author, an object Post and an object Comment. Comment BELONGS_TO Post and Post BELONGS_TO Author.

I want to get all Comments which the Post created after the '01-02-2015' AND Author's birthday is after 01-01-1980.

How can I develop condition/criteria for these rules?

Thanks

class Comment extends CActiveRecord {
   public function search(){
      $criteria = new CDbCriteria;
      $criteria->together = true;
      $criteria->with = array(
          'post' => array(
              'condition' => "created>='2015-02-01'",
              'joinType' => "INNER JOIN",
              'with' => array(
                  'author' => array(
                      'condition' => "birthday>='1980-01-01'",
                      'joinType' => "INNER JOIN",
                  )
              )
          )
      );

      return new CActiveDataProvider($this, array(
          'criteria' => $criteria
      ));
   }
}