private function findReceipt($hash)
 {
     $model = Receipt::findByHash($hash);
     if (!$model) {
         throw new NotFoundHttpException();
     }
     return $model;
 }
 /**
  * @return \yii\db\ActiveQuery
  */
 public function getReceipt()
 {
     return $this->hasOne(\common\models\Receipt::className(), ['id' => 'receipt_id']);
 }