Features: 1) Add get_queryset method to BrandViewSet for conditional prefetching of categories.

Fixes: 1) Add missing import for `Prefetch` in `core/viewsets.py`.

Extra: n/a.

core/viewsets.py

@@ -2,7 +2,7 @@ import logging
 import uuid
 from uuid import UUID
 
-from django.db.models import Q
+from django.db.models import Q, Prefetch
 from django.http import Http404
 from django.shortcuts import get_object_or_404
 from django.utils.decorators import method_decorator
@@ -308,6 +308,19 @@ class BrandViewSet(EvibesViewSet):
         "list": BrandSimpleSerializer,
     }
 
+    def get_queryset(self):
+        queryset = Brand.objects.all()
+
+        if self.request.user.has_perm("view_category"):
+            queryset = queryset.prefetch_related("categories")
+        else:
+            queryset = queryset.prefetch_related(
+                Prefetch("categories", queryset=Category.objects.filter(is_active=True))
+                )
+
+        return queryset
+
+
 
 @extend_schema_view(**PRODUCT_SCHEMA)
 class ProductViewSet(EvibesViewSet):