Hi!

I have the problem that a DTO with SerializedPath attributes, which I convert to an XML via Symfony Serializer (SerializerInterface), does not have an expected behavior with arrays. Unfortunately, the documentation for this is small due to the novelty (SerializedPath is added in 6.2), so I can't get anywhere without help.

My goal is to create an XML like this one:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <methods>
        <include code="Method A"/>
        <include code="Method B"/>
    </methods>
</root>

For example with such a class:

class TestClass
{
    #[SerializedPath('[methods][include][@code]')]
    public array $methods = ['Method A', 'Method B'];
}

// ...

$this->serializer->serialize(new TestClass(), 'xml');

But I just get always the same issue:

{
    "title": "An error occurred",
    "detail": "The element you are trying to set is already populated: \"[methods][include][@code]\".",
    "trace": [
        {
            "file": "/srv/api/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php",
            "line": 655
        }
   ]
}

I already looked at the documentation for the SerializedPath (https://symfony.com/doc/current/serializer.html#using-nested-attributes) and also for the PropertyAccesswhich is internal used (https://symfony.com/doc/current/components/property_access.html#reading-from-arrays), but I don't see a suitable example from which I can work it out.

Perhaps one approaches the matter in a completely different way. I just want to avoid all the nested DTOs with SerializedName attributes.

If anyone can help, I would be very grateful!