yii2 unique 验证

[[‘email‘],‘unique‘],

<?php $form = ActiveForm::begin([‘enableAjaxValidation‘ => true]); ?>

public function actionCreate()
    {
        $model = new User();
        if (Yii::$app->request->isAjax && $model->load(Yii::$app->request->post())) {
            Yii::$app->response->format = Response::FORMAT_JSON;
            return ActiveForm::validate($model);
        }
}