Php 如何在Symfony 4中通过GET请求访问属性？

我尝试打开一个页面，例如：

http://project:8888/products

在那一页上，我喜欢用slug来显示标题：

<h1>{{page.slug}}</h1>

{{page.slug}

一个问题是，打开页面需要很长时间。另一个问题是，存在错误消息，无法访问属性slug

MyController.php：

<?php

namespace App\Controller;

use App\Entity\User;
use App\Entity\Pages;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Omines\DataTablesBundle\Controller\DataTablesTrait;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\Serializer\Serializer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
use Symfony\Component\Serializer\Encoder\JsonEncoder;


class DataTableController extends Controller
{

  /**
  * @Route("/{slug}", name="page")
  */

  use DataTablesTrait;

  public function showPage($slug)
  {
    $pages = $this->getDoctrine()->getRepository(Pages::class)->findAll();
    $page = $this->getDoctrine()->getRepository(Pages::class)->find($slug);
    $table = $this->getDoctrine()->getRepository(User::class)->findAll();

    $serializer = new Serializer(array(new GetSetMethodNormalizer()), array('json' => new JsonEncoder()));
    $json_string = $serializer->serialize($table, 'json');

    $file = 'data/data.json';
    file_put_contents($file, $json_string);

    return $this->render('list.html.twig', ['pages' => $pages, 'page' => $page]);
  }


}

---

调用find（$slug）将无法工作。“查找”始终查找id，因此它将找不到该页。您需要findOneBy（['slug'=>$slug]）

页面

的内容是什么？
$page
为空。在您的数据库中似乎找不到包含slug
产品的页面。要长时间打开该页面，您可以查看symfony profiler中的
性能
，试图找出原因。find（$slug）不起作用。“查找”始终查找id。因此它将找不到该页。你需要findOneBy（['slug'=>$slug]）@FuceBads请将你的评论作为答案发布，因为这是这里的实际解决方案。
{% extends 'base.html.twig' %}

{% block title %}Symfony{% endblock %}

{% block body %}

<div class="wrapper">

{{ include('inc/navbar.html.twig') }}

<!-- Content Wrapper. Contains page content -->
<div class="content-wrapper" style="min-height: 866px;">

  <section class="content-header">
    <h1>{{page.slug}}</h1>

  </section>

  <section class="content">
    <div class="row">
      <div class="col-xs-12">
        <div class="box">
          <!-- /.box-header -->
          <div class="box-body">

            <table id="example" class="display" width="100%" cellspacing="0">
              <thead>
                <tr>
                  <th>ID</th>
                  <th>E-Mail</th>
                </tr>
              </thead>
            </table>
          </div>
        </div>
      </div>
    </div>
  </section>
</div>
<!-- /.content-wrapper -->
</div>
<!-- ./wrapper -->

{% endblock %}


{% block javascripts %}

{% endblock %}

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\PagesRepository")
 */
class Pages
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $name;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $template;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $icon;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $slug;

    public function getId()
    {
        return $this->id;
    }

    public function getName(): ?string
    {
        return $this->name;
    }

    public function setName(string $name): self
    {
        $this->name = $name;

        return $this;
    }

    public function getTemplate(): ?string
    {
        return $this->template;
    }

    public function setTemplate(string $template): self
    {
        $this->template = $template;

        return $this;
    }

    public function getIcon(): ?string
    {
        return $this->icon;
    }

    public function setIcon(string $icon): self
    {
        $this->icon = $icon;

        return $this;
    }

    public function getSlug(): ?string
    {
        return $this->slug;
    }

    public function setSlug(string $slug): self
    {
        $this->slug = $slug;

        return $this;
    }
}