EasyAdmin 3.X -如何查看相关实体`toString`，而不是列表中的关联个数？

// src/Controller/Admin/UserController.php
namespace App\Controller\Admin;

use App\Entity\User;
use EasyCorp\Bundle\EasyAdminBundle\Config\Action;
use EasyCorp\Bundle\EasyAdminBundle\Config\Actions;
use EasyCorp\Bundle\EasyAdminBundle\Config\Filters;
use EasyCorp\Bundle\EasyAdminBundle\Config\Sort;
use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractCrudController;
use EasyCorp\Bundle\EasyAdminBundle\Field\AssociationField;
use EasyCorp\Bundle\EasyAdminBundle\Field\TextField;

class UserController extends AbstractCrudController
{
    public static function getEntityFqcn(): string
    {
        return User::class;
    }

    public function configureActions(Actions $actions): Actions
    {
        return $actions
            // ...
        ;
    }

    public function configureFields(string $pageName): iterable
    {
        yield TextField::new('username', 'Username');
        yield AssociationField::new('posts', 'Posts')
            ->onlyOnIndex() // 只在列表视图中显示
            ->setTemplatePath('admin/fields/posts.html.twig') // 自定义模板路径
        ;
    }
}

{# templates/admin/fields/posts.html.twig #}
{% for post in entity.posts %}
    {{ post.title }}
{% endfor %}

// src/Entity/Post.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass=PostRepository::class)
 */
class Post
{
    // ...

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

php bin/console cache:clear --env=prod

php bin/console cache:warmup --env=dev