Symfony:如何对实体中不存在的字段使用表单筛选器？

// src/Form/FilterType.php
namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class FilterType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class, [
                'label' => 'Name',
                'required' => false,
            ])
            ->add('age', TextType::class, [
                'label' => 'Age',
                'required' => false,
            ])
            ->add('nonexistent_field', TextType::class, [
                'label' => 'Nonexistent Field',
                'required' => false,
            ]);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => null,
            'method' => 'GET',
            'csrf_protection' => false,
        ]);
    }
}

// src/Controller/FilterController.php
namespace App\Controller;

use App\Form\FilterType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class FilterController extends AbstractController
{
    /**
     * @Route("/filter", name="filter")
     */
    public function filter(Request $request)
    {
        $form = $this->createForm(FilterType::class);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $data = $form->getData();

            // Perform filtering based on the form data
            // ...

            // Redirect or render the filtered results
            // ...
        }

        return $this->render('filter/index.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}