如何在Symfony 4中正确声明类？

我试图根据本教程（）使用dataTables，但遇到了一些问题：

src/Controller/DataTableController.php

我收到错误消息：

---

您忘记了

usersDataable

类文件的名称空间。我想应该是这样

namespace-App\DataTable\UsersDataTable

---

还要更改services.yaml中的一个，我将

namespace App\DataTable\UsersDataTable

添加到我的文件

src/DataTables/UsersDataTable.php

的顶部，但仍然显示相同的错误消息。我应该在services.yaml中更改是什么意思？在service.yml中，您使用的是无效的

AppBundle\DataTables\usersdatable

。您应该将其更改为类名称空间

App\DataTable\UsersDataTable

。AppBundle通常用于Symfony 2/3。好的，也更改了此选项。还是一样的错误。不幸的是：（它应该是DataTable

s

和一个

s

，我在那里输入了一个错误。

名称空间App\DataTables\UsersDataTable；

。因此它必须与您的目录名相同。我在services.yaml

App\DataTables\：resource:“../src/DataTables/UsersDataTables”autowire:true public:false中测试了这段代码标签：[数据表]

<?php

namespace App\Controller;

use DataTables\DataTablesInterface;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\Routing\Annotation\Route;

/**
*
* @Route("/users", name="users")
*
* @param Request $request
* @param DataTablesInterface $datatables
* @return JsonResponse
*/

class DataTableController extends Controller
{

  const ID = 'users';

  public function usersAction(Request $request, DataTablesInterface $datatables): JsonResponse
  {
    try {
      // Tell the DataTables service to process the request,
      // specifying ID of the required handler.
      $results = $datatables->handle($request, 'users');

      return $this->json($results);
    }
    catch (HttpException $e) {
      // In fact the line below returns 400 HTTP status code.
      // The message contains the error description.
      return $this->json($e->getMessage(), $e->getStatusCode());
    }
  }

}

<?php

use DataTables\DataTableHandlerInterface;
use DataTables\DataTableQuery;
use DataTables\DataTableResults;
use Symfony\Bridge\Doctrine\RegistryInterface;

class UsersDataTable implements DataTableHandlerInterface
{
    protected $doctrine;

    /**
     * Dependency Injection constructor.
     *
     * @param RegistryInterface $doctrine
     */
    public function __construct(RegistryInterface $doctrine)
    {
        $this->doctrine = $doctrine;
    }

    /**
     * {@inheritdoc}
     */
    public function handle(DataTableQuery $request): DataTableResults
    {
        /** @var \Doctrine\ORM\EntityRepository $repository */
        $repository = $this->doctrine->getRepository('AppBundle:User');

        $results = new DataTableResults();

        // Total number of users.
        $query = $repository->createQueryBuilder('u')->select('COUNT(u.id)');
        $results->recordsTotal = $query->getQuery()->getSingleScalarResult();

        // Query to get requested entities.
        $query = $repository->createQueryBuilder('u');

        // Search.
        if ($request->search->value) {
            $query->where('(LOWER(u.username) LIKE :search OR' .
                          ' LOWER(u.email) LIKE :search)');
            $query->setParameter('search', strtolower("%{$request->search->value}%"));
        }

        // Filter by columns.
        foreach ($request->columns as $column) {
            if ($column->search->value) {
                $value = strtolower($column->search->value);

                // "ID" column
                if ($column->data == 0) {
                    $query->andWhere('u.id = :id');
                    $query->setParameter('id', intval($value));
                }
                // "Username" column
                elseif ($column->data == 1) {
                    $query->andWhere('LOWER(u.username) LIKE :username');
                    $query->setParameter('username', "%{$value}%");
                }
                // "Email" column
                elseif ($column->data == 2) {
                    $query->andWhere('LOWER(u.email) LIKE :email');
                    $query->setParameter('email', "%{$value}%");
                }
            }
        }

        // Order.
        foreach ($request->order as $order) {

            // "ID" column
            if ($order->column == 0) {
                $query->addOrderBy('u.id', $order->dir);
            }
            // "Username" column
            elseif ($order->column == 1) {
                $query->addOrderBy('u.username', $order->dir);
            }
            // "Email" column
            elseif ($order->column == 2) {
                $query->addOrderBy('u.email', $order->dir);
            }
        }

        // Get filtered count.
        $queryCount = clone $query;
        $queryCount->select('COUNT(u.id)');
        $results->recordsFiltered = $queryCount->getQuery()->getSingleScalarResult();

        // Restrict results.
        $query->setMaxResults($request->length);
        $query->setFirstResult($request->start);

        /** @var \AppBundle\Entity\User[] $users */
        $users = $query->getQuery()->getResult();

        foreach ($users as $user) {
            $results->data[] = [
                $user->getId(),
                $user->getUsername(),
                $user->getEmail(),
            ];
        }

        return $results;
    }
}

parameters:
    locale: 'en'

services:
    # default configuration for services in *this* file
    _defaults:
        autowire: true      # Automatically injects dependencies in your services.
        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
        public: false       # Allows optimizing the container by removing unused services; this also means
                            # fetching services directly from the container via $container->get() won't work.
                            # The best practice is to be explicit about your dependencies anyway.


    # makes classes in src/ available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    App\:
        resource: '../src/*'
        exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'

    # controllers are imported separately to make sure services can be injected
    # as action arguments even if you don't extend any base controller class
    App\Controller\:
        resource: '../src/Controller'
        tags: ['controller.service_arguments']

    # add more service definitions when explicit configuration is needed
    # please note that last definitions always *replace* previous ones

    datatable.users:
       class: AppBundle\DataTables\UsersDataTable
       tags: [{ name: datatable, id: users }]
       arguments: [ '@doctrine' ]