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