/**
  * Finds the Acdfrequenceenroll model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $enrollid
  * @param integer $scheduleid
  * @param string $frequencydate
  * @param integer $timeid
  * @return Acdfrequenceenroll the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($enrollid, $scheduleid, $frequencydate, $timeid)
 {
     if (($model = Acdfrequenceenroll::findOne(['enrollid' => $enrollid, 'scheduleid' => $scheduleid, 'frequencydate' => $frequencydate, 'timeid' => $timeid])) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }