It seems as if types created with strawberry.django.type cannot be used with interfaces currently.
Consider the following models and types:
# models.py
class Meal(Model):
is_draft = BooleanField()# graphql.py
@strawberry.interface
class DiaryEntry:
is_draft: bool
@strawberry.django.type(models.Meal)
class Meal(DiaryEntry):
pass
@strawberry.type
class Query:
@strawberry.field
def diary(self, info: Info) -> List[DiaryEntry]:
return Meal.objects.all()When trying to query the diary entries the following error would be raised:
"Abstract type 'DiaryEntry' must resolve to an Object type at runtime for field 'Query.diary'. Either the 'DiaryEntry' type should provide a 'resolve_type' function or each possible type should provide an 'is_type_of' function."
The easiest fix that I've found would be to allow the type's django model in the is_type_of function:
# strawberry/schema/schema_converter.py:265
# Current:
is_type_of = (
(lambda obj, _: isinstance(obj, object_type.origin))
if object_type.interfaces
else None
)# Fixed:
if type_definition.interfaces:
def is_type_of(obj, _):
classes = (type_definition.origin,)
if hasattr(object_type, "_django_type"):
classes = (*classes, object_type._django_type.model)
return isinstance(obj, classes)
else:
is_type_of = None
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