Had mistakenly put the setup.cfg format in pyproject.toml.

pyproject.toml

@@ -20,3 +20,8 @@ classifiers = [
 [project.urls]
 "Homepage" = "https://git.vickys-corner.xyz/ace/starfields-drf-generics"
  
+[tool.setuptools.packages.find]
+where = ["starfields_drf_generics"]
+
+[tool.setuptools.package-data]
+"templates.filters" = ["*.html"]

starfields_drf_generics/filters.py

@@ -2,7 +2,6 @@ from django_filters import rest_framework as filters
 from django.contrib.postgres.search import TrigramSimilarity
 from django.db.models.functions import Concat
 from django.db.models import CharField
-from shop.models.product import Product, Facet
 from rest_framework.filters import BaseFilterBackend
 import operator
 from django.template import loader
@@ -216,13 +215,20 @@ class FacetFilter(BaseFilterBackend):
     
     def assign_view_facets(self, request, view):
         if not hasattr(view, 'facets'):
+            if hasattr(view, 'facet_class'):
+                self.facet_class = self.get_facet_class(view, request)
+            
+            assert self.facet_class is not None, (
+                f"{view.__class__.__name__} should include a `facet_class` attribute"
+            )
+            
             if view.category:
                 if view.category.tn_ancestors_pks:
-                    view.facets = Facet.objects.filter(Q(category__id=view.category.id) | Q(category__id__in=view.category.tn_ancestors_pks.split(','))).prefetch_related('facet_tags')
+                    view.facets = self.facet_class.objects.filter(Q(category__id=view.category.id) | Q(category__id__in=view.category.tn_ancestors_pks.split(','))).prefetch_related('facet_tags')
                 else:
-                    view.facets = Facet.objects.filter(category__id=view.category.id).prefetch_related('facet_tags')
+                    view.facets = self.facet_class.objects.filter(category__id=view.category.id).prefetch_related('facet_tags')
             else:
-                view.facets = Facet.objects.filter(category__tn_level=1).prefetch_related('facet_tags')
+                view.facets = self.facet_class.objects.filter(category__tn_level=1).prefetch_related('facet_tags')
     
     def get_filters_dict(self, request, view):
         """