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