Symfony 7 - 无法解决的争论

Question

我是一名初学者，我正在尝试按照教程在 Symfony 7 下创建博客，不幸的是，当我想使用他的地址（slug）显示文章页面时，我发现自己陷入了错误，我得到：

控制器“App\Controller\ArticleController::show”需要无法解析的“$article”参数。无法自动装配“App\Controller\ArticleController::show()”的参数 $article：它需要“App\Entity\Article”的实例，但此类型已在“config/services.yaml”中排除。

当我将 Article 实体注入到 ArticleController 的 show 函数中时，出现了问题。

<?php

namespace App\Controller;

use App\Entity\Article;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

class ArticleController extends AbstractController
{
    #[Route('/article/{slug}', name: 'article_show')]
    public function show(Article $article): Response
    {     
        return $this->render('article/show.html.twig', [
            'article' => $article,
        ]);
    }
}

当我使用主页上的链接时，显示的路线是正确的（带有标头）。

知道如何解决这个问题吗？ （一定很简单但我不明白）

我尝试检查我的代码，尤其是实体：

<?php

namespace App\Entity;

use App\Model\TimestampedInterface;
use App\Repository\ArticleRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\DBAL\Types\Types;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity(repositoryClass: ArticleRepository::class)]
class Article implements TimestampedInterface
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private ?int $id = null;

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

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

    #[ORM\Column(type: Types::TEXT, nullable: true)]
    private ?string $content = null;

    #[ORM\Column(length: 100, nullable: true)]
    private ?string $featuredText = null;

    #[ORM\Column(type: Types::DATETIME_MUTABLE)]
    private ?\DateTimeInterface $createdAt = null;

    #[ORM\Column(type: Types::DATETIME_MUTABLE, nullable: true)]
    private ?\DateTimeInterface $updatedAt = null;

    /**
     * @var Collection<int, Category>
     */
    #[ORM\ManyToMany(targetEntity: Category::class, mappedBy: 'articles')]
    private Collection $categories;

    /**
     * @var Collection<int, Comment>
     */
    #[ORM\OneToMany(targetEntity: Comment::class, mappedBy: 'article', orphanRemoval: true)]
    private Collection $comments;

    #[ORM\ManyToOne]
    private ?Media $featuredImage = null;

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

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

    public function getTitle(): ?string
    {
        return $this->title;
    }

    public function setTitle(string $title): static
    {
        $this->title = $title;

        return $this;
    }

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

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

        return $this;
    }

    public function getContent(): ?string
    {
        return $this->content;
    }

    public function setContent(?string $content): static
    {
        $this->content = $content;

        return $this;
    }

    public function getFeaturedText(): ?string
    {
        return $this->featuredText;
    }

    public function setFeaturedText(?string $featuredText): static
    {
        $this->featuredText = $featuredText;

        return $this;
    }

    public function getCreatedAt(): ?\DateTimeInterface
    {
        return $this->createdAt;
    }

    public function setCreatedAt(\DateTimeInterface $createdAt): static
    {
        $this->createdAt = $createdAt;

        return $this;
    }

    public function getUpdatedAt(): ?\DateTimeInterface
    {
        return $this->updatedAt;
    }

    public function setUpdatedAt(?\DateTimeInterface $updatedAt): static
    {
        $this->updatedAt = $updatedAt;

        return $this;
    }

    /**
     * @return Collection<int, Category>
     */
    public function getCategories(): Collection
    {
        return $this->categories;
    }

    public function addCategory(Category $category): static
    {
        if (!$this->categories->contains($category)) {
            $this->categories->add($category);
            $category->addArticle($this);
        }

        return $this;
    }

    public function removeCategory(Category $category): static
    {
        if ($this->categories->removeElement($category)) {
            $category->removeArticle($this);
        }

        return $this;
    }

    /**
     * @return Collection<int, Comment>
     */
    public function getComments(): Collection
    {
        return $this->comments;
    }

    public function addComment(Comment $comment): static
    {
        if (!$this->comments->contains($comment)) {
            $this->comments->add($comment);
            $comment->setArticle($this);
        }

        return $this;
    }

    public function removeComment(Comment $comment): static
    {
        if ($this->comments->removeElement($comment)) {
            // set the owning side to null (unless already changed)
            if ($comment->getArticle() === $this) {
                $comment->setArticle(null);
            }
        }

        return $this;
    }

    public function getFeaturedImage(): ?Media
    {
        return $this->featuredImage;
    }

    public function setFeaturedImage(?Media $featuredImage): static
    {
        $this->featuredImage = $featuredImage;

        return $this;
    }
}

你明白了，因此目标是显示文章页面：

{% extends 'base.html.twig' %}

{% block title %}{{ article.title }}{% endblock %}

{% block body %}
    <div class="container">
        <h1>{{ article.title }}</h1>
        <hr>
        {{ article.content|raw }}
    </div>
{% endblock %}

非常感谢，

Answer 1

您可以使用 MapEntity 属性来解决您的问题：

<?php

namespace App\Controller;

use App\Entity\Article;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

class ArticleController extends AbstractController
{
    #[Route('/article/{slug}', name: 'article_show')]
    public function show(#[MapEntity(mapping:['slug'=>'slug'])]Article $article): Response
    {     
        return $this->render('article/show.html.twig', [
            'article' => $article,
        ]);
    }
}

mapEntity 属性将允许 Symfony 找到带有你的路由参数中的 slug 的实体。