Allow fragments for models with inheritance

The library appears to currently be lacking the ability to use fragments when using models that have subclasses.

models.py

class MyModel(models.Model):
    name = models.CharField(max_length=50)

class ModelA(MyModel):
    extra = models.IntegerField()

class ModelB(MyModel):
    text = models.TextField()

fields.py

class ModelType(DjangoObjectType):
    class Meta:
        model = MyModel

class ModelAType(DjangoObjectType):
    class Meta:
        model = ModelA

class ModelBType(DjangoObjectType):
    class Meta:
        model = ModelB

query

query {
    all_models {
        __typename,
        name,
        ... on ModelAType {
            extra
        },
        ... on ModelBType {
            text
        }
    }
}

Suggestion: Modify DjangoObjectType to also act like a Union, or create a DjangoUnionType, with the ability to resolve type based on subclass and using the registered type for the subclass if applicable.

[cfarvidson]

Any new progress on this? I’m also getting this error when using Django polymorphic.

[MichaelrMentele]

@japrogramer When I do the above, the type checks for each of those unioned models resolves to the root type or abstract type, at least when using django-typed-models and then graphene complains that I have multiple models of the same type.