如何解决：教义没有正确返回

Question

我想动态删除帖子功能，但结果是错误，因为值为空。

控制器

/**

  * @Route("/posts/delete/{id}", name="delete_post", methods={"DELETE"})

  */

  public function deletePost($id, LoggerInterface $logger)

  {

    $post=$this->getDoctrine()->getRepository(Article::class)->find($id);

    if(!$post)

    {

        $this->addFlash(

            'notice',

            'Something went wrong'

        );

        $logger->info($id);

    }

    else

    {

        $entityManager=$this->getDoctrine()->getManager();

        $entityManager->remove($post);

        $entityManager->flush();

        $entityManager->clear();

    }

    $response=new Response();

    return($response);

  }

JS

const articles = document.getElementById("articles");

if (articles) {

 articles.addEventListener("click", e => {

  if (e.target.className === "btn btn-danger delete-article") {

  if (confirm("Are you sure?")) {

    const id = e.target.getAttribute("data-id");

    fetch("/posts/delete/${id}", {

      method: "DELETE"

    }).then(res => window.location.reload());

  }

 }

 });

}

枝条

<table border="1" id="articles">

        <tr>

            <th class="pt">Post title</th>

            <th class="pe">Edit</th>

            <th class="pd">Delete</th>

        </tr>

        {% for article in articles %}

            <tr>

                <td class="title">{{ article.title }}</td>

                <td class="edit">

                    <a href="{{ path('posts_editor', {'id':article.id}) }}" class="btn btn-primary edit-article">

                        <img src="{{ asset('images/edit.png') }}" class="image">

                    </a>

                </td>

                <td class="delete">

                    <a href="#" class="btn btn-danger delete-article" data-id="{{article.id}}">

                        <img src="{{ asset('images/delete.png') }}" class="image">

                    </a>

                </td>

            </tr>

        {% endfor %}

    </table>

我是用视频教程做的，我不知道视频上有什么问题，这段代码正在运行，但是当我写它时，我在下面遇到了一个错误

错误

EntityManager#remove() 期望参数 1 是一个实体对象，给定 NULL。

希望任何人都可以帮助我，因为它不起作用，我真的很沮丧。

Answer 1

很明显，$post是空的，所以在这种情况下，你可以转储这两个变量，我希望你能弄清楚发生了什么dump($id);dump($post);exit你可以看文档Doctrine Removing entity更新：在您的代码中，您总是在发送响应，您需要将响应更新为特定的成功或错误代码，默认情况下它发送 200 代码，并且您还需要更新您的代码public function deletePost($id, LoggerInterface $logger){$post=$this->getDoctrine()->getRepository(Article::class)->find($id);&nbsp; &nbsp; if(!$post)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; $this->addFlash(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'notice',&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'Something went wrong'&nbsp; &nbsp; &nbsp; &nbsp; );&nbsp; &nbsp; &nbsp; &nbsp; $logger->info($id);&nbsp; &nbsp; &nbsp; &nbsp; exit() your code here&nbsp; &nbsp; &nbsp; &nbsp; or throw an exception here&nbsp; &nbsp; }&nbsp; &nbsp; try {&nbsp; &nbsp; &nbsp; &nbsp; //remove entity here&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; $response = new Response(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'Content',&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Response::HTTP_OK,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ['content-type' => 'text/html']&nbsp; &nbsp; &nbsp; &nbsp; );&nbsp; &nbsp; &nbsp; &nbsp; return $response;&nbsp; &nbsp; } catch (\Exception $exception) {&nbsp; &nbsp; &nbsp; &nbsp; $response = new Response(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $exception->getMessage(),&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Response::HTTP_INTERNAL_SERVER_ERROR,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ['content-type' => 'text/html']&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; );&nbsp; &nbsp; &nbsp; &nbsp; return $response;&nbsp; &nbsp; }}