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Home Backend Development PHP Tutorial MVC中,层与层之间消息传递(双向)的问题

MVC中,层与层之间消息传递(双向)的问题

Jun 06, 2016 pm 08:52 PM
mvc php

例如,C中的表单数据在做完验证后,如何传递给M层?
目前采用的是在Action中就把数据组装成对应的领域对象,然后通过传参的方式给制定的model~
但是这样做的话无疑把复杂的组装过程交给了action的开发人员,这样做会使得分层之间的职责划分不够合理,c和m层的人员都需要去了解领域对象的相关接口。

另外,model做完业务后的反馈数据如何回传给action,尤其是多条数据返回,简单的返回一个数组总觉得不够优雅,导致两层之间的依赖过强,不利于开发~

有没有好的解决方案?

回复内容:

例如,C中的表单数据在做完验证后,如何传递给M层?
目前采用的是在Action中就把数据组装成对应的领域对象,然后通过传参的方式给制定的model~
但是这样做的话无疑把复杂的组装过程交给了action的开发人员,这样做会使得分层之间的职责划分不够合理,c和m层的人员都需要去了解领域对象的相关接口。

另外,model做完业务后的反馈数据如何回传给action,尤其是多条数据返回,简单的返回一个数组总觉得不够优雅,导致两层之间的依赖过强,不利于开发~

有没有好的解决方案?

关于数据结构,我的建议是,PHP代码,拒绝数据对象。PHP最牛的,或者说最具有优势的数据结构就是数组,所以传递数组不是不优雅,这就是PHP的最佳实践。
关于MVC之间的传递,我的建议是各层只把自己了解的数据以数组形式传递给其它层,接收数据的时候,做一次可用性验证,拼装成自己需要的数据结构(最好也是数组)。

你的问题我也纠结过,目前我的解决办法是这样的:

<code>/**
 * 创建新主题
 * @return string
 */
public function actionNew()
{
    if (Yii::$app->user->isGuest) {
        Yii::$app->user->loginRequired();
    }

    $form = new TopicForm();
    $form->author_id = Yii::$app->user->getId();
    $form->ip_address = Yii::$app->request->getUserIP();

    if ($form->load($_POST) && $form->validate())
    {
        Services::getTopics()->create($form->getAttributes(), $form->content);
        $this->redirect(['/forum']);
    }

    return $this->render('new', [
        'model' => $form
    ]);
}
</code>
Copy after login

这段代码是基于Yii2的,作用是在社区发一个新贴。

我的做法是用model(实际上我写的名字是form,因为Yii2的form其实就是model)来收集提交上来的表单数据,然后进行验证

<code>$form = new TopicForm();
$form->author_id = Yii::$app->user->getId();
$form->ip_address = Yii::$app->request->getUserIP();
</code>
Copy after login

验证通过后会使用相应的服务将数据写入数据

<code>Services::getTopics()->create($form->getAttributes(), $form->content);
</code>
Copy after login

已知这样做的好处是form基本可以重用,因为他不涉及其他东西,只是验证数据合法性,所以不管是web、api,我都能直接使用他。

Services同理,不管别的,拿到数据就往数据库写(当然复杂的还要在内部处理,这里不说),同样也能复用。

不过这种做法有个问题,就是你需要同时了解 Form 跟 Services 的功能,而Yii2默认的做法是你不需要了解他们,一个典型的Yii2从表单到数据库的代码是这样的:

<code>public function actionCreate()
{
    $model = new User();
    if ($model->load($_POST) && $model->save()) {
        $this->redirect(['index']);
    }

    return $this->render('create', ['model' => $model]);
}
</code>
Copy after login

看出来了吗?人家压根就不分层,你根本不用关心其他的,把数据load进去就好了,至于怎么验证,怎么存储,都是黑箱在操作,开发速度大大提升,但是代码耦合略高,比如web注册用户跟app上注册用户的情景可能是不同的(当然,Yii2提供了scenario机制,一定程度上可以避免这个问题)

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