As you can see in the code below, when I am trying to delete my category. It's give me following errors:

正如您在下面的代码中所看到的，当我试图删除我的类别时。它给了我以下错误：

Cannot autowire argument $category of "App\Controller\AdminController::deleteCategory()": it references class "App\Entity\Category" but no such service exists.

无法自动连接“App\Controller\AdminController：：deleteCategory()”：的参数$CATEGORY，因为它引用了类“App\Entity\Category”，但不存在此类服务。

This is the code of function I have created in AdminController.php:

这是我在AdminController.php中创建的函数代码：

<?php

namespace App\Controller;

命名空间应用程序\控制器；

use App\Utils\CategoryTreeAdminList;

使用App\Utils\CategoryTreeAdminList；

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

使用Symfony\Bundle\FrameworkBundle\Controller\AbstractController；

use Symfony\Component\HttpFoundation\Response;

使用symfony\Component\HttpFoundation\Response；

use Symfony\Component\Routing\Annotation\Route;

使用symfony\Component\Routing\Annotation\Routing；

use App\Entity\Category;

使用应用程序\实体\类别；

#[Route('/admin')]

#[Route(‘/admin’)]

class AdminController extends AbstractController
{

类AdminController扩展AbstractController{

#[Route('/delete-category/{id}', name: 'delete_category')]

public function deleteCategory(Category $category): Response
{
    $entityManager = $this->getDoctrine()->getManager();
    $entityManager->remove($category);
    $entityManager->flush();
    return $this->redirectToRoute('categories');
}

}

}

Following is the code where I have mentioned categoryList:

下面的代码中我提到了categyList：

<?php

namespace App\Utils;

命名空间App\Utils；

use App\Utils\AbstractClasses\CategoryTreeAbstract;

使用App\Utils\AbstractClasses\CategoryTreeAbstract；

class CategoryTreeAdminList extends CategoryTreeAbstract
{

类CategoryTreeAdminList扩展了CategoryTreeAbstract{

public $html_1 = '<ul class="fa-ul text-left">';
public $html_2 = '<li><i class="fa-li fa fa-arrow-right"></i>  ';
public $html_3 = '<a href="';
public $html_4 = '">';
public $html_5 = '</a> <a onclick="return confirm(\'Are you sure?\');" href="';
public $html_6 = '">';
public $html_7 = '</a>';
public $html_8 = '</li>';
public $html_9 = '</ul>';


public function getCategoryList(array $categories_array)
{
    $this->categorylist .= $this->html_1;
    foreach ($categories_array as $value) {
        $url_edit = $this->urlgenerator->generate('edit_category', ['id' => $value['id']]);

        $url_delete = $this->urlgenerator->generate('delete_category', ['id' => $value['id']]);
        $this->categorylist .= $this->html_2 . $value['name'] . 
        $this->html_3 . $url_edit . $this->html_4 . ' Edit' . 
        $this->html_5 . $url_delete . $this->html_6 . 'Delete' . 
        $this->html_7;

        if (!empty($value['children'])) {
            $this->getCategoryList($value['children']);
        }

        $this->categorylist .= $this->html_8;
    }

    $this->categorylist .= $this->html_9;

    return $this->categorylist;
}

}

}

@saddam Go ahead with this code..... you'll may solve your error with this and let me know if its solved.

@萨达姆继续使用这个代码.....你可以用这个来解决你的错误，如果问题解决了，让我知道。

#[Route('/delete-category/{id}', name: 'delete_category')]

public function deleteCategory($id): Response

{
$entityManager = $this->getDoctrine()->getManager();
$category = $entityManager->getRepository(Category::class)->find($id);
$entityManager->remove($category);
$entityManager->flush();
return $this->redirectToRoute('categories');

}

Thank You.

谢谢。

You'll need to run this command: composer require sensio/framework-extra-bundle

您需要运行以下命令：Composer需要Sensio/framework-Extra-Bundle

If you use symfony >= 5.4 you should not install sensio/framework-extra-bundle because sensio/framework-extra-bundle has been abandoned. See the solution above by Ayush

如果您使用symfony>=5.4，则不应该安装sensio/framework-Extra-Bundle，因为Sensio/framework-Extra-Bundle已被放弃。请参阅Ayush提供的上述解决方案