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