factory_boy: factory.Trait() cannot get a factory.RelatedFactory override

Traits does not seem to allow a related factory override.

Ex:

class MyModelFactory(factory.django.DjangoModelFactory):
    class Meta:
          model = models.MyModel
    class Params:
        with_my_other_model = factory.Trait(
             my_other_model=factory.RelatedFactory(MyOtherModelFactory, 'my_model')
        )

It will complain my_other_model is not a valid field.

That would be awesome.