根据编辑的对象动态修改表单字段

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// src/Admin/PostAdmin

namespace App\Admin;

use Sonata\AdminBundle\Admin\AbstractAdmin;
use Sonata\AdminBundle\Form\FormMapper;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\Extension\Core\Type\FileType;

final class PostAdmin extends AbstractAdmin
{
    // ...

    protected function configureFormFields(FormMapper $form): void
    {
        // Description field will always be added to the form:
        $form
            ->add('description', TextareaType::class)
        ;

        $subject = $this->getSubject();

        // If you're using auto-generated identifiers
        if ($subject->getId() === null) {
            // The thumbnail field will only be added when the edited item is created
            $form->add('thumbnail', FileType::class);
        }

        // Name field will be added only when create an item
        if ($this->isCurrentRoute('create')) {
            $form->add('name', TextType::class);
        }

        // The foo field will added when current action is related acme.demo.admin.code Admin's edit form
        if ($this->isCurrentRoute('edit', 'acme.demo.admin.code')) {
            $form->add('foo', 'text');
        }
    }
}