[VarExporter] Cannot access property starting with "\0"

[ivanbogomoloff]

Symfony version(s) affected

7.0.6

Description

I have entity App\Entity\Organization

namespace App\Entity;

class Organization {
 #[ORM\Column(length: 255)]
    private ?string $title = null;

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

and form with data_class = App\Entity\Organization

and route like this

#[Route('/{id}/edit', name: self::ROUTE_APP_ADMIN_ORGANIZATION_EDIT, methods: ['GET', 'POST'])]
    public function edit(Request $request, Organization $organization, EntityManagerInterface $entityManager): Response
    {
       form = $this->createForm(OrganizationForm::class, $organization);
    }

When i change fields in entity ( for example add new field ), add migration, migrate. Then if i don't reset cache manually or do not restart my php-fpm server, i get error Cannot access property starting with "\0"

Error:
Cannot access property starting with "\0"

  at vendor/symfony/var-exporter/LazyGhostTrait.php:207
  at Proxies\__CG__\App\Entity\Organization->__set()
     (vendor/symfony/var-exporter/Internal/Hydrator.php:156)
  at Proxies\__CG__\App\Entity\Organization->Symfony\Component\VarExporter\Internal\{closure}()
     (vendor/symfony/var-exporter/Hydrator.php:72)
  at Symfony\Component\VarExporter\Hydrator::hydrate()
     (vendor/symfony/var-exporter/Internal/LazyObjectState.php:58)
  at Symfony\Component\VarExporter\Internal\LazyObjectState->initialize()
     (vendor/symfony/var-exporter/LazyGhostTrait.php:120)
  at Proxies\__CG__\App\Entity\Organization->__get()
     (src/Entity/Organization.php:117)
  at App\Entity\Organization->getTitle()
     (vendor/symfony/property-access/PropertyAccessor.php:388)
  at Symfony\Component\PropertyAccess\PropertyAccessor->readProperty()
     (vendor/symfony/property-access/PropertyAccessor.php:99)
  at Symfony\Component\PropertyAccess\PropertyAccessor->getValue()
     (vendor/symfony/form/Extension/Core/DataAccessor/PropertyPathAccessor.php:80)
  at Symfony\Component\Form\Extension\Core\DataAccessor\PropertyPathAccessor->getPropertyValue()
     (vendor/symfony/form/Extension/Core/DataAccessor/PropertyPathAccessor.php:45)
  at Symfony\Component\Form\Extension\Core\DataAccessor\PropertyPathAccessor->getValue()
     (vendor/symfony/form/Extension/Core/DataAccessor/ChainAccessor.php:37)
  at Symfony\Component\Form\Extension\Core\DataAccessor\ChainAccessor->getValue()
     (vendor/symfony/form/Extension/Core/DataMapper/DataMapper.php:50)
  at Symfony\Component\Form\Extension\Core\DataMapper\DataMapper->mapDataToForms()
     (vendor/symfony/form/Form.php:319)
  at Symfony\Component\Form\Form->setData()
     (vendor/symfony/form/Form.php:408)
  at Symfony\Component\Form\Form->initialize()
     (vendor/symfony/form/FormBuilder.php:176)
  at Symfony\Component\Form\FormBuilder->getForm()
     (vendor/symfony/form/FormFactory.php:28)
  at Symfony\Component\Form\FormFactory->create()
     (vendor/symfony/framework-bundle/Controller/AbstractController.php:323)
  at Symfony\Bundle\FrameworkBundle\Controller\AbstractController->createForm()
     (src/Controller/Admin/Organization/OrganizationController.php:98)
  at App\Controller\Admin\Organization\OrganizationController->edit()
     (vendor/symfony/http-kernel/HttpKernel.php:178)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw()
     (vendor/symfony/http-kernel/HttpKernel.php:76)
  at Symfony\Component\HttpKernel\HttpKernel->handle()
     (vendor/symfony/http-kernel/Kernel.php:185)
  at Symfony\Component\HttpKernel\Kernel->handle()
     (vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php:35)
  at Symfony\Component\Runtime\Runner\Symfony\HttpKernelRunner->run()
     (vendor/autoload_runtime.php:29)
  at require_once('/var/www/html/vendor/autoload_runtime.php')
     (public/index.php:5)                

If i change code without ParamConverter all works fine. I get not proxied entity and var exporter works fine

How to reproduce

Create route with annotation with #[Route('/{id}/edit', name: 'my_route', methods: ['GET', 'POST'])] with id param to convert param to entity and make entity for this with title property. Then create form with data_class in configureOptions

PHP version is: PHP 8.2.18 (cli) (built: Apr 11 2024 19:20:54) (NTS)

Database is postgresql

Setttings for doctrine.yaml

doctrine:
    dbal:
        url: '%env(resolve:DATABASE_URL)%'
        profiling_collect_backtrace: '%kernel.debug%'
        use_savepoints: true
    orm:
        auto_generate_proxy_classes: true
        enable_lazy_ghost_objects: true
        report_fields_where_declared: true
        validate_xml_mapping: true
        naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
        auto_mapping: true
        mappings:
            App:
                type: attribute
                is_bundle: false
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'App\Entity'
                alias: App
        controller_resolver:
            auto_mapping: true

Possible Solution

Custom ParamConverter or use manually finding entity by params

This works fine.

#[Route('/{id}/edit', name: 'my_route', methods: ['GET', 'POST'])]
public function edit(Request $request, int $id, OrganizationRepository $organizationRepo, EntityManagerInterface $entityManager): Response
  {
$organizationRepo->find($id); 
}

Additional Context

[xabbuh]

Can you create a small example application that allows to reproduce your issue?

[derrabus]

Symfony version(s) affected

7.0.6

Does this still happen with 7.0.7? We've fixed some issues in that area lately.

[ivanbogomoloff]

Symfony version(s) affected

7.0.6

Does this still happen with 7.0.7? We've fixed some issues in that area lately.

Yes, it does. I upgrade symfony to 7.0.7 and i still stable repeat this error. I can't share source code, and i can't reporudce this on fresh symfony install, but in my project it stable error. Under stable i mean that case: if i changed entity fields and make migration then error occurs . While i don't change entity fields it works wihtout errors.

[xabbuh]

Without being able to reproduce I am afraid that you will have to debug the root cause yourself.

[ivanbogomoloff]

I think it's var-exporter bug because in source code hydrates starts from this and because in 6.x.x symfony version i never seen it before with large of coding in sf 6

Hydrator::hydrate($object, ["\0Bar\0privateBarProperty" => $propertyValue]);

Where "\0" is special property and it doesn't exists for proxy object of doctrine entity where it not correctly reseted (may be it depends on dump/cache component)

And of course i think it's all same errors like this #54477

[nicolas-grekas]

This code is special handling for SplObjectStorage instances, I doubt it's the culprit. Can you please create a small app or script that'd allow us to reproduce?

[ivanbogomoloff]

I will try but not now. Sorry.

[ivanbogomoloff]

I can give more info if i dumped symfony/vendor/symfony/var-exporter/Hydrator.php like this.

public static function hydrate(object $instance, array $properties = [], array $scopedProperties = []): object
    {
        if ($properties) {
            $class = $instance::class;
            $propertyScopes = InternalHydrator::$propertyScopes[$class] ??= InternalHydrator::getPropertyScopes($class);

            foreach ($properties as $name => &$value) {
                [$scope, $name, $readonlyScope] = $propertyScopes[$name] ?? [$class, $name, $class];
                $scopedProperties[$readonlyScope ?? $scope][$name] = &$value;
            }
            unset($value);
        }
        // DUMP HERE
        var_dump($scopedProperties);
        foreach ($scopedProperties as $scope => $properties) {
            if ($properties) {
                (InternalHydrator::$simpleHydrators[$scope] ??= InternalHydrator::getSimpleHydrator($scope))($properties, $instance);
            }
        }

        return $instance;
    }

I see 2 instances of my entity

/var/www/html/vendor/symfony/var-exporter/Hydrator.php:69:
array (size=1)
  'Doctrine\ORM\EntityManager' => 
    array (size=4)
      'expressionBuilder' => null
      'closed' => boolean false
      'filterCollection' => null
      'cache' => null
/var/www/html/vendor/symfony/var-exporter/Hydrator.php:69:
array (size=2)
  'App\Entity\Organization' => 
    array (size=19)
      'title' => null
      'description' => null
      'headUser' => null
      'photos' => null
      'description2' => null
      'roles' => null
      'rolePermissionsPerStage' => null
      'applicationForAssistanceSettings' => null
      'createdAt' => null
      'updatedAt' => null
      'latitude' => null
      'longitude' => null
      'phoneNumber' => null
      'email' => null
      'address' => null
      'addressDictData' => null
      'photoImagePath' => null
      'author' => null
      'editor' => null
  'Proxies\__CG__\App\Entity\Organization' => 
    array (size=1)
      '�App\Entity\Organization�applicationForAssistanceSettings2' => null

Last entity Proxies\__CG__\App\Entity\Organization doesn't exsist while i don't change (add new fields) if it exists then error occurs.

Then if i changed vendor code ( i did it only for issue purposes) like this

public static function hydrate(object $instance, array $properties = [], array $scopedProperties = []): object
    {
        if ($properties) {
            $class = $instance::class;
            $propertyScopes = InternalHydrator::$propertyScopes[$class] ??= InternalHydrator::getPropertyScopes($class);

            foreach ($properties as $name => &$value) {
                [$scope, $name, $readonlyScope] = $propertyScopes[$name] ?? [$class, $name, $class];
                $scopedProperties[$readonlyScope ?? $scope][$name] = &$value;
            }
            unset($value);
        }
        unset($scopedProperties['Proxies\__CG__\App\Entity\Organization']);
        foreach ($scopedProperties as $scope => $properties) {
            if ($properties) {
                (InternalHydrator::$simpleHydrators[$scope] ??= InternalHydrator::getSimpleHydrator($scope))($properties, $instance);
            }
        }

        return $instance;
    }

then all fine, because $scopedProperties entity is correct.

Hope this helps.