DeserializeProvider calls PartialDenormalizationException::getErrors(), deprecated in Symfony 8.1 #8650

API Platform version(s) affected: 4.3.21 and the current head of 4.4 (5.0 is not affected)

Symfony 8.1 deprecates PartialDenormalizationException::getErrors() in favour of getNotNormalizableValueErrors(). The 4.4 branch still calls it: https://github.com/api-platform/core/blob/4.4/src/State/Provider/DeserializeProvider.php#L110

Since symfony/serializer 8.1: The "Symfony\Component\Serializer\Exception\PartialDenormalizationException::getErrors()" method is deprecated, use "Symfony\Component\Serializer\Exception\PartialDenormalizationException::getNotNormalizableValueErrors()" instead.

Every 422 caused by a denormalization error goes through this line, so with collect_denormalization_errors: true it shows up in each test that sends invalid input. 5.0 no longer has the call, but it went away with the rewrite in #8211, which won't be backported.

Possible solution

In Symfony 8.1 getErrors() only returns getNotNormalizableValueErrors(), so the swap is exact. 4.4 also supports symfony/serializer ^7.4, which doesn't have that method, so the fallback would be needed. Yet the fix seems as trivial as

$errors = method_exists($e, 'getNotNormalizableValueErrors')
    ? $e->getNotNormalizableValueErrors()
    : $e->getErrors();

foreach ($errors as $exception) {
    ...