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