显示Symfony 3.4 Easy Admin捆绑包中大量实体的合计计数

use EasyCorp\Bundle\EasyAdminBundle\Config\Dashboard;
use EasyCorp\Bundle\EasyAdminBundle\Config\MenuItem;
use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractDashboardController;
use EasyCorp\Bundle\EasyAdminBundle\Router\AdminUrlGenerator;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class DashboardController extends AbstractDashboardController
{
    /**
     * @Route("/admin", name="admin")
     */
    public function index(): Response
    {
        // ...
    }

    public function configureDashboard(): Dashboard
    {
        return Dashboard::new()
            ->setTitle('My Admin');
    }

    public function configureMenuItems(): iterable
    {
        yield MenuItem::linkToCrud('Entity 1', 'fa fa-file')->setController(Entity1CrudController::class);
        yield MenuItem::linkToCrud('Entity 2', 'fa fa-file')->setController(Entity2CrudController::class);
        // ...
    }

    public function configureCrud(): Crud
    {
        return Crud::new()
            ->setEntity(Entity1::class)
            ->setController(Entity1CrudController::class)
            ->setVirtualField('recordCount', function (Entity1 $entity) {
                $count = $this->getDoctrine()->getRepository(Entity1::class)->countQueryBuilder()
                    ->getQuery()->getSingleScalarResult();
                return $count;
            });
    }
}