SQLAlchemy Enum with 'nullable=True' doesn't work correctly

[Lelby]

I have SQLAlchemy model with some enum:

variants = ('red', 'green', 'yellow')
my_enum_type = sqlalchemy.dialects.postgresql.ENUM(*variants)

class CarModel(Base):
    color = sqlalchemy.Column(my_enum_type)

and graphene Schema which uses SQLAlchemyObjectType:

class Car(SQLAlchemyObjectType):
    class Meta:
       model = CarModel

I want to create a mutation:

class CreateCar(graphene.Mutation):
    class Arguments:
        color = Car._meta.fields['color'].type

    ...
    def mutate(self, info, color):
        db_session.add(CarModel(color=color))
        db_session.commit()
        return ...

There are two issues:

1. (Minor) I refer to enum in a strange way: .._meta.fields.., but it is known issue: Proper support for the SQLAlchemy Enum type #78
2. (Major) If I try to execute program with such schema, I get error:

File "contrib/python/graphene/graphene/types/argument.py", line 67, in to_arguments
    raise ValueError('Unknown argument "{}".'.format(default_name))
ValueError: Unknown argument "color"

If I add nullable=False to SQLAlchemy model, everything works fine.

[erikwrede]

Can't reproduce in v3

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related topics referencing this issue.