drf-spectacular issue with filterset_fields - django

Question

I am trying to implement drf-spectacular to an existing Django REST API.
However I am getting the following error, when attempting to run
./manage.py spectacular --file schema.yml
Error:
python3.7/site-packages/django_filters/filterset.py", line 352, in get_filters
"%s" % ', '.join(undefined)
TypeError: 'Meta.fields' contains fields that are not defined on this FilterSet: client, tenant_id, subtenant_id, data_stream_id
The filters do work, but don't seem to play nicely with the drf-spectacular lib. Can anyone please advise on how this might be solved?
Specs as follows:
Python 3.7.2
Django 3.0.2
django-filter 2.2.0
django-rest-framework 0.1.0
djangorestframework 3.12.1
drf-spectacular 0.12.0
Viewset example:
class subModelViewSet(viewsets.ModelViewSet):
"""Standard ViewSet for the DataStream Model."""
queryset = DataStream.objects.all()
serializer_class = DataStreamSerializer
filter_backends = [DjangoFilterBackend]
filterset_fields = ('client', 'tenant_id', 'subtenant_id', 'data_stream_id',)
Serializer example:
class DataStreamSerializer(serializers.ModelSerializer):
"""Class to validate an uploaded DataStream."""
class Meta:
"""Nested Meta Class."""
model = DataStream
fields = '__all__'

Answer 1

Turns out it was a Viewset that was trying to apply filterset_fields on a subModel that did not directly contain those fields, but rather referenced by ForeignKey on another Parent Model. While I thought these filters were working as expected, I think the actual filtering on those fields was being performed by middleware in this case.
Removing the fields from the Viewset allows the schema to be generated with no issue. I am able to access the /docs page fully rendered and /schema endpoint working. Very impressed with drf-spectacular thus far.
example model:
class DataSteam(models.Model):
"""Class for DataSteam Model."""
client = models.CharField(max_length=200)
tenant_id = models.CharField(max_length=200)
subtenant_id = models.CharField(max_length=200)
data_stream_id = models.CharField(max_length=200)
class subModel(models.Parent):
"""Class for storing linked datastream records."""
ds = models.ForeignKey(DataStream, on_delete=models.CASCADE)