Impossible to map to a nested collection of Target-Classes?

[FranzBruckner]

I am struggling now since hours, maybe I am doing something wrong, maybe there is a bug or it's just not possible.

Basically I have a collection in the src and the target-object. The elements are all of the same type (typehinted, docblocks, everything there).
But I am no capable to map the elements from the source-objects collection to the type of the target-objects collection.
The elements of the collection are mapped but not to the target type :-(

Again, please apologize if I missed that somewhere in the documentation.

Call

assert($searchResult instanceof LegacyPaginatedData);
$response = $autoMapper->map($searchResult, UserSubusersResponse::class, [
      'groups' => ['user:subuser'],
  ]);

Result

UserSubusersResponse::$currentPage is fine.
UserSubusersResponse::$data is a collection of UserEntities (instead of a collection of UserSubuserResources)

Target-Objects

// Target (Root)
#[Groups(['user:subuser'])]
final class UserSubusersResponse
{
    #[MapFrom(LegacyPaginatedData::class)]
    public int $currentPage;

    /** @var iterable<UserSubuserResource> */
    #[MapFrom(LegacyPaginatedData::class)]
    public iterable $data = [];
}


#[Groups(['user:subuser'])]
final class UserSubuserResource
{
    #[MapFrom(User::class, property: 'uid')]
    public int $uid;

    #[MapFrom(User::class)]
    public string $email;
}

Source-Objects

/**
 * @template T
 */
#[Groups(['user:subuser'])]
final readonly class LegacyPaginatedData
{
    /**
     * @param iterable<T> $data
     */
    private function __construct(
        /** @var iterable<T> */
        public array $data,
        public int $currentPage,
        public int $currentPageSize,
        public int $pageCount,
        public int $totalCount,
        public string $orderBy = 'timeCreated',
        public string $orderDirection = 'ASC',
    ) {
    }
}


#[Groups(['user:subuser'])]
class UserEntity {
  // protected properties and public getters
}

[joelwurtz]

You should take a look at what the mapper is resolving for the metadata (if you use symfony, there is a profiler / command to debug this, otherwise you can take a look at the generated code)

I suspect it does not know the source type of the collection so he map to nothing (he assume it's the same type by default if he doesn't know)