Clients : possibilité d'ordonner par nom / prénom

backend/controllers/UserController.php

         
         $query = User::findBy($params);
         $dataProvider = new ActiveDataProvider([
-            'query' => $query
+            'query' => $query,
+            'sort' => ['attributes' => ['nom','prenom']],
         ]);
-
+        
         $etablissement = Etablissement::find()
             ->where(['id' => Yii::$app->user->identity->id_etablissement])
             ->one();