gistfile1.txt

 public function actionNewAddons()
    {
        \Yii::$app->response->format = Response::FORMAT_JSON;
        $item = new TypeCarAddons();
        $item->loadDefaultValues();
        return [
            'success' => 1,
            'data' => $this->renderPartial('partial/update/_addons_item', ['form' => new ActiveForm(), 'item' => $item, 'key' => uniqid()])
        ];
    }