Fix extend_schema_field type hint to allow a Field type

[johnthagen]

drf-spectacular/drf_spectacular/utils.py

Lines 401 to 402 in 9ab8d44

	def extend_schema_field(
	field: Union[_SerializerType, Field, OpenApiTypes, Dict],

I would suggest also allowing Type[Field] to be passed in. I tried it out and it seems to work, but type checking will fail unless you pass an instance.

@extend_schema_field(field=_CustomField)
class CustomJSONField(JSONField):
    ...

Perhaps it would make more sense to only allow passing in Type[Field]? Not sure why an instance would make sense in this context (but Serializer instances are also currently allowed, so to be consistent it should probably allow Field instances too).

[tfranzel]

good point! verified that field classes work as well.

FYI: we need instances to model cases like these:

@extend_schema_field(OrderOfferDiscountSerializer(many=True))

@extend_schema_field(serializers.ChoiceField(choices=['a', 'b']))

[johnthagen]

FYI: we need instances to model cases like these:

Ah, good point. Hadn't thought of that

[johnthagen]

I tried out installing 5104ef6 master and the type hint looks great now!