/**
  * Updates an existing Client model.
  * If update is successful, the browser will be redirected to the 'view' page.
  * @param integer $id
  * @return mixed
  */
 public function actionUpdate($id)
 {
     $modelClient = Client::findOne($id);
     $modelsOrder = Order::findAll(['id_client' => $modelClient->id]);
     if (Yii::$app->request->post() && $modelClient->load(Yii::$app->request->post())) {
         $oldIDs = ArrayHelper::map($modelsOrder, 'id', 'id');
         $modelsOrder = Model::createMultiple(Order::classname(), $modelsOrder);
         Model::loadMultiple($modelsOrder, Yii::$app->request->post());
         $deletedIDs = array_diff($oldIDs, array_filter(ArrayHelper::map($modelsOrder, 'id', 'id')));
         // validate all models
         $valid = $modelClient->validate();
         $valid = Model::validateMultiple($modelsOrder) && $valid;
         if ($valid) {
             $transaction = \Yii::$app->db->beginTransaction();
             try {
                 if ($flag = $modelClient->save(false)) {
                     if (!empty($deletedIDs)) {
                         Order::deleteAll(['id' => $deletedIDs]);
                     }
                     foreach ($modelsOrder as $modelOrder) {
                         $modelOrder->id_client = $modelClient->id;
                         if (!($flag = $modelOrder->save(false))) {
                             $transaction->rollBack();
                             break;
                         }
                     }
                 }
                 if ($flag) {
                     $transaction->commit();
                     return $this->redirect(['view', 'id' => $modelClient->id]);
                 }
             } catch (Exception $e) {
                 $transaction->rollBack();
             }
         }
     }
     return $this->render('update', ['modelClient' => $modelClient, 'modelsOrder' => empty($modelsOrder) ? [new Order()] : $modelsOrder]);
 }