如何使用sonata admin创建具有fixtures的用户

composer require symfony/symfony
composer require sonata-project/admin-bundle

sonata_admin:
    dashboard:
        groups:
            app.admin.group.user:
                label: Users
                items:
                    - app.admin.user
    admin:
        user:
            class: App\Entity\User
            controller: App\Controller\Admin\UserAdminController
            translation: App\Entity\User

namespace App\Admin;

use Sonata\AdminBundle\Admin\AbstractAdmin;
use Sonata\AdminBundle\Datagrid\ListMapper;
use Sonata\AdminBundle\Form\FormMapper;

class UserAdmin extends AbstractAdmin
{
    protected function configureFormFields(FormMapper $formMapper)
    {
        $formMapper
            ->add('username')
            ->add('password')
            // 添加其他字段
        ;
    }

    protected function configureListFields(ListMapper $listMapper)
    {
        $listMapper
            ->addIdentifier('username')
            ->add('password')
            // 添加其他字段
        ;
    }
}

namespace App\DataFixtures;

use Doctrine\Bundle\FixturesBundle\Fixture;
use Doctrine\Persistence\ObjectManager;
use App\Entity\User;

class UserFixtures extends Fixture
{
    public function load(ObjectManager $manager)
    {
        $user = new User();
        $user->setUsername('admin');
        $user->setPassword('password');
        // 设置其他属性

        $manager->persist($user);
        $manager->flush();
    }
}

php bin/console doctrine:fixtures:load