It seems impossible to instantiate GeneToGoTermAssociation objects using the python classes

[KeithKelleher]

Describe the bug
I'm using the python classes for the biolink model, currently trying to create a GeneToGoTermAssociation object.
Whatever I pass as the subject of the association, it gets cast to a "GeneId" and GeneId can't pass through the post_init validation for FunctionalAssociation. It fails with this error:

TypeError: biolink_model.datamodel.model.MacromolecularMachineMixin() argument after ** must be a mapping, not GeneId

To Reproduce
Here's a minimal reproduction:

from biolink_model.datamodel import GeneToGoTermAssociation, Gene

gene = Gene(id="NCBIGene:10513", category="biolink:Gene")
print(gene)

ggta = GeneToGoTermAssociation(id=2, subject=gene, predicate="biolink:associated_with", object="GO:0005875")

Expected behavior
It should be possible to create those objects using the python classes

What working group (or team) did this request originate from?
NCATS Informatics