无法自动装配 "App\Controller\BlogController::edit()" 的参数 $blog：它引用 class "App\Entity\Blog" 但不存在此类服务

Question

我在这里尝试编辑 post 但它显示了这个自动装配错误......即使代码中的一切似乎都是正确的......

这是我用来编辑我的 symfony 项目的具有编辑功能的控制器文件……我不认为有任何语法错误……它看起来像别的东西

src/Controller/BlogController.php

 
<?php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\Routing\Annotation;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\File\UploadedFile;

use Symfony\Component\DependencyInjection;

use App\Repository\BlogRepository;
use App\Entity\Blog;
use App\Form\BlogType;


class BlogController extends AbstractController
{
 /**
    * @Route("/{id}/edit", name="edit", methods={"GET","POST"})
    * @param Request $request
    * @param Blog $blog
    * @return Response
    */
    public function edit(Request $request, Blog $blog, $id): Response
    {          
        $form = $this->createForm(BlogType::class, $blog);
        $form->handleRequest($request);      

        $entityManager = $this->getDoctrine()->getManager();
        $blog = $entityManager->getRepository(Blog::class)->find($id);
            
        if ($form->isSubmitted()) {
            $file = $request->files->get('blog')['featureImage'];
            if($file != null){
                
                $uploads_directory = $this->getParameter('uploads_directory');
                $filename = $file->getClientOriginalName();
                $file->move(
                    $uploads_directory,
                    $filename
                );
                $blog->setFeatureImage($filename);
            }
            
                
            $entityManager = $this->getDoctrine()->getManager();
            $entityManager->persist($blog);
            $entityManager->flush();    

            $this->addFlash('success', 'blog edited successfully!');

            return $this->redirectToRoute('blog');
        }

        return $this->render('blog/edit.html.twig', [ 
            'edit' => $form->createView(),
            'blog' => $blog,
            'id' => $blog->getid(),
        ]);
    } 

}

here is my blog entity file codes......

src/Entity/Blog.php

<?php

namespace App\Entity;

use App\Controller\Admin\BlogController;
use App\Repository\BlogRepository;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;

/**
 * @ORM\Table(name="blogs")
 * @UniqueEntity("blogTitle")
 * @ORM\Entity(repositoryClass=BlogRepository::class)
 */
class Blog
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @Assert\NotBlank(message = "The blog title of category is required.")
     * @ORM\Column(type="string", length=255)
     */
    private $title;

    /**
     * @Assert\NotBlank(message = "The short description of category is required.")
     * @Assert\Length(min=500)
     * @ORM\Column(type="text")
     */
    private $shortDescription;

    /**
     * @Assert\NotBlank(message = "The description of category is required.")
     * @ORM\Column(type="text")
     */
    private $description;

    /**
     * @ORM\Column(type="string", length=255, nullable=true)
     * @Assert\NotBlank(message = "The feature image of category is required.")
     */
    private $featureImage;

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

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

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

        return $this;
    }

    public function getShortDescription(): ?string
    {
        return $this->shortDescription;
    }

    public function setShortDescription(string $shortDescription): self
    {
        $this->shortDescription = $shortDescription;

        return $this;
    }


    public function getDescription(): ?string
    {
        return $this->description;
    }

    public function setDescription(string $description): self
    {
        $this->description = $description;

        return $this;
    }

    public function getFeatureImage(): ?string
    {
        return $this->featureImage;
    }

    public function setFeatureImage(?string $featureImage): self
    {
        $this->featureImage = $featureImage;

        return $this;
    }
}

and here is my template where i used to create edit botton to edit post...

模板：blog/index.html.twig

   

{% for blog in blog %}
    <tr>
     <td>{{ blog.id }}</td>
     <td>{{ blog.title }}</td>
     <a href="{{ path('edit', {'id': blog.id, 'title': blog.title}) }}" class="btn btn-outline-info">{{ 'Edit'|trans }}</a>
    </tr>
   {% else %}

Answer 1

由于您使用的是 ParamConverters，但您在控制器方法中同时添加了 $blog 和 $id 是错误的。

只需这样做：

/**
* @Route("/{id}/edit", name="edit", methods={"GET","POST"})
*/
public function edit(Request $request, Blog $blog): Response
{     

}

您的 Twig 模板也是如此。您只需使用 id。您应该删除 title:

{% for blog in blog %}
<tr>
 <td>{{ blog.id }}</td>
 <td>{{ blog.title }}</td>
 <a href="{{ path('edit', {'id': blog.id }) }}" class="btn btn-outline-info">{{ 'Edit'|trans }}</a>
</tr>
{% else %}

额外建议：我删除了 @return 和 @param 文档块。由于您使用的是 return/param 类型，因此这些类型没有任何价值。

Answer 2

根据我的评论。这就是我要做的，这样您就不必注入您的实体。让表单 class 处理它。

<?php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\Routing\Annotation;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\File\UploadedFile;

use Symfony\Component\DependencyInjection;

use App\Repository\BlogRepository;
use App\Entity\Blog;
use App\Form\BlogType;


class BlogController extends AbstractController
{
 /**
    * @Route("/{id}/edit", name="edit", methods={"GET","POST"})
    * @param Request $request
    * @return Response
    */
    public function edit(Request $request, $id): Response
    {
        $entityManager = $this->getDoctrine()->getManager();
        $blog = $entityManager->getRepository(Blog::class)->find($id);
      
        $form = $this->createForm(BlogType::class, $blog);
        $form->handleRequest($request);      
            
        if ($form->isSubmitted() && $form->isValid()) {
            $file = $request->files->get('blog')['featureImage'];
            if($file != null){
                
                $uploads_directory = $this->getParameter('uploads_directory');
                $filename = $file->getClientOriginalName();
                $file->move(
                    $uploads_directory,
                    $filename
                );
                $blog->setFeatureImage($filename);
            }
            
                
            $entityManager->persist($blog);
            $entityManager->flush();    

            $this->addFlash('success', 'blog edited successfully!');

            return $this->redirectToRoute('blog');
        }

        return $this->render('blog/edit.html.twig', [ 
            'edit' => $form->createView(),
            'blog' => $blog,
            'id' => $blog->getid(),
        ]);
    } 

}

无法自动装配 "App\Controller\BlogController::edit()" 的参数 $blog：它引用 class "App\Entity\Blog" 但不存在此类服务

Cannot autowire argument $blog of "App\Controller\BlogController::edit()": it references class "App\Entity\Blog" but no such service exists

runtime-error

autowired

symfony

symfony4