日期时间对象在表单 POST 后转换为字符串类型

Question

我有一个用于编辑News实体的表单。在这里：

<form action="{{path('validate_news', {'id': news.id})}}" method="POST" >
  <div class="form-group row">
  <label for="Text" class="col-sm-4 col-form-label">Text</label>
  <div class="col-sm-5">
    <textarea name = "text" type="text" class="form-control" id="text" aria-describedby="textHelp" placeholder="{{news.text|e}}"></textarea>
    </div>
  </div>
  <div class="form-group row">
    <label for="startDate" class="col-sm-4 col-form-label">Start Date</label>
    <div class="col-sm-5">
    <input name = "startDate" type="date" class="form-control" id="startDate" aria-describedby="startDate" placeholder="{{news.startDate|date('d-m-Y')}}">
    </div>
  </div>
  <div class="form-group row">
   <label for="expireDate" class="col-sm-4 col-form-label">Expire Date</label>
   <div class="col-sm-5">
    <input name = "expireDate" type="date" class="form-control" id="expireDate" aria-describedby="emailHelp" placeholder="{{news.expireDate|date('d-m-Y')}}">
    </div>
   </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

validate_news路由有控制器，当用户单击"提交"按钮时激活：

/**
* @Route("/validateNews/{id}", name = "validate_news")
* @Method("POST")
**/
public function validateNewsAction(Request $request, $id) {
    $repository = $this->getDoctrine()->getRepository('AppBundle:News');
    $news = $repository->findOneById($id);
    if ($request->getMethod() == 'POST') {
        $text = $request->get('text');
        $startDate = new DateTime();
        $startDate = $request->get('startDate');
        $expireDate = new DateTime();
        $expireDate = $request->get('expireDate');
    }
    $news->setText($text);
    $news->setStartDate($startDate);
    $news->setexpireDate($expireDate);
    $em = $this->getDoctrine()->getManager();
    $em->persist($news);
    $em->flush();
    return $this->render("AppBundle:Default:editNewsSuccess.html.twig", array ('news' => $news));
}

startDate和expireDate属性定义为 datetime 。

当我尝试刷新News对象时，出现此错误：

FatalErrorException in DateTimeType.php line 53:
Error: Call to a member function format() on a non-object

在控制器中的$startDate上启动var_dump，我可以看到它具有string类型。但是在形式上，我将其定义为datetime.

为什么POST电话中会发生这种情况？

Answer 1

因为您正在从表单中获取字符串值。您需要为实体设置日期时间对象。

像那样尝试

$startDate = new DateTime($request->get('startDate'));