/**
  * @param null $type
  * @return \yii\db\ActiveQuery
  */
 public function getComments($type = null)
 {
     $query = Comment::find()->andWhere(['objectClass' => str_replace('\\', '_', get_class($this->owner)), 'objectPk' => $this->owner->id]);
     if ($type) {
         $query->andWhere(['type' => $type]);
     }
     return $query;
 }
 public function down()
 {
     $this->dropTable(\dmuratov\comment\models\Comment::tableName());
 }