How to load relation via ID that's in data?

[timmaier]

How do I go about the following use case

I want to infer a LocationData $location which is a HasOne relation of the user model. Lets say I'm in a UserData class.

#[TypeScript]
#[MapName(SnakeCaseMapper::class)]
class OrganisationPriceData extends Data
{
    public function __construct(
        #[TypeScriptOptional]
        public ?int $id,
        
        #[TypeScriptOptional]
        public int $locationId,
        #[TypeScriptOptional]
        public Lazy|LocationData $location,
    }

    public static function fromModel(User $user): self
    {
        return new self(
            id: $user->id,
            location: Lazy::whenLoaded('location', $user, fn () => LocationData::fromModel($user->location)),
       );
    }
}

The frontend only sends the ID as location_id as I want to minimise the amount of data sent and I don't know how big the LocationData is going to get.

I think I'm looking for something like:

use App\Models\Location;

#[FromRequestProperty('location_id', Location::class)]
public Lazy|LocationData $location,

[timmaier]

I've tried using

#[FromRouteParameter('location_id')]
public Lazy|LocationData $location,

This still causes the LocationData validation to trigger though.