如何准确使用findBy按类别显示文章

Question

我是 symfony 的新手，我在一个电子商务网站上工作。我解决了一些已经在尝试不同解决方案的错误，但是对于这个我感到卡住了。我试图按类别显示我的文章，但它不起作用，因为它显示错误：

Warning: Trying to access array offset on value of type null

我在 symfony 中创建了一个控制台控制器来调用关联的视图以仅显示该类别的文章，预计之后对游戏做同样的事情但它似乎没有找到与文章关联的类别？

这是我的控制台控制器：

namespace App\Controller;

use App\Repository\ArticlesRepository;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

class ConsolesController extends AbstractController
{
    
    #[Route('/consoles', name: 'app_consoles')]
    public function index(ArticlesRepository $repositoryArticles): Response
    {
        $consoles =  $repositoryArticles->findBy(['category' => 1]);
        return $this->render('consoles/index.html.twig', [
            'controller_name' => 'ConsolesController',
            'consoles' => $consoles,
        ]);
    }
}

我的实体文章

<?php

namespace App\Entity;

use App\Repository\ArticlesRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity(repositoryClass: ArticlesRepository::class)]
class Articles
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private ?int $id = null;

    #[ORM\Column(length: 80)]
    private ?string $nomArticle = null;

    #[ORM\Column(length: 255)]
    private ?string $imageArticle = null;

    #[ORM\Column]
    private ?float $prixArticle = null;

    #[ORM\Column(length: 200)]
    private ?string $descriptionArticle = null;

    #[ORM\ManyToMany(targetEntity: Categories::class, inversedBy: 'articles')]
    #[ORM\JoinColumn(nullable: false)]

    private Collection $category;

    public function __construct()
    {
        $this->category = new ArrayCollection();
    }

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

    public function getNomArticle(): ?string
    {
        return $this->nomArticle;
    }

    public function setNomArticle(string $nomArticle): self
    {
        $this->nomArticle = $nomArticle;

        return $this;
    }

    public function getImageArticle(): ?string
    {
        return $this->imageArticle;
    }

    public function setImageArticle(string $imageArticle): self
    {
        $this->imageArticle = $imageArticle;

        return $this;
    }

    public function getPrixArticle(): ?float
    {
        return $this->prixArticle;
    }

    public function setPrixArticle(float $prixArticle): self
    {
        $this->prixArticle = $prixArticle;

        return $this;
    }

    public function getDescriptionArticle(): ?string
    {
        return $this->descriptionArticle;
    }

    public function setDescriptionArticle(string $descriptionArticle): self
    {
        $this->descriptionArticle = $descriptionArticle;

        return $this;
    }

    /**
     * @return Collection<int, Categories>
     */
    public function getCategory(): Collection
    {
        return $this->category;
    }

    public function addCategory(Categories $category): self
    {
        if (!$this->category->contains($category)) {
            $this->category->add($category);
        }

        return $this;
    }

    public function removeCategory(Categories $category): self
    {
        $this->category->removeElement($category);

        return $this;
    }

    public function __toString() 
    {
        return $this->nomArticle;
    }
}

还有我的实体类别

<?php

namespace App\Entity;

use App\Repository\CategoriesRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity(repositoryClass: CategoriesRepository::class)]
class Categories
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private ?int $id = null;

    #[ORM\Column(length: 50)]
    private ?string $nomCategorie = null;

    #[ORM\ManyToMany(targetEntity: Articles::class, mappedBy: 'category')]
    private Collection $articles;

    public function __construct()
    {
        $this->articles = new ArrayCollection();
    }

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

    public function getNomCategorie(): ?string
    {
        return $this->nomCategorie;
    }

    public function setNomCategorie(string $nomCategorie): self
    {
        $this->nomCategorie = $nomCategorie;

        return $this;
    }

    /**
     * @return Collection<int, Articles>
     */
    public function getArticles(): Collection
    {
        return $this->articles;
    }

    public function addArticle(Articles $article): self
    {
        if (!$this->articles->contains($article)) {
            $this->articles->add($article);
            $article->addCategory($this);
        }

        return $this;
    }

    public function removeArticle(Articles $article): self
    {
        if ($this->articles->removeElement($article)) {
            $article->removeCategory($this);
        }

        return $this;
    }

    public function __toString()
    {
        return $this->nomCategorie;
    }
}

他们都通过“多对多”关系联系在一起，他们都应该可以访问对方，但仍然有些东西不起作用。 预先感谢您的帮助。

---

快进我花时间继续这个项目，这是我在我的 ArticlesRepository 中尝试使用 DQL 后所做的：

    public function findArticlesByCategory($category)
    {
    return $this->createQueryBuilder('a')
                ->innerJoin('a.categories', 'c', 'WITH', 'c.nom_categorie = :category')
//           ->andWhere('c.exampleField = :val')
                ->setParameter('category', $category)
                ->getQuery()
                ->getResult()
       ;
   }

然后在我的控制器中我尝试使用该方法：

 #[Route('/{category}', name: 'app_category_by_name')]
    public function categoryByName(ManagerRegistry $doctrine, $category): Response
    {
        $repositoryArticle =$doctrine->getRepository(Articles::class);
        $articles = $repositoryArticle->findArticlesByCategory($category);

        return $this->render('home/index.html.twig', [
            'articles' => $articles,
        ]);

        
    }

但是symfony给了我一个错误：

“App\Controller\Articles”类不存在

那么我哪里做错了？这是我第一次在 DQL 上查询，在 phpmyadmin 中它似乎比这更简单？？

感谢比我更有经验的人能指出我正确的方向