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