view表单验证没问题 在validate()一直是false [ 新手入门 ]

if($model->load(Yii::$app->request->post()) && $model->validate()){
    var_dump(Yii::$app->request->post());
}else{
    return $this->render('index',['model'=>$model]);
    //var_dump($data['model']);
}