Features: 1) Add filter_parent_uuid method in CategoryFilter to handle parent UUID filtering; 2) Expand CategoryFilter fields to include parent_uuid and slug.

Fixes: 1) Update `resolve_categories` in schema to include all categories in query.

Extra: 1) Add missing `uuid` import in `filters.py`; 2) Improve handling for null and invalid parent UUID values in `filter_parent_uuid`.

core/filters.py

@@ -1,5 +1,6 @@
 import json
 import logging
+import uuid
 
 from django.db.models import Avg, FloatField, OuterRef, Q, Subquery, Value
 from django.db.models.functions import Coalesce
@@ -251,7 +252,7 @@ class WishlistFilter(FilterSet):
 class CategoryFilter(FilterSet):
     uuid = UUIDFilter(field_name="uuid", lookup_expr="exact")
     name = CharFilter(field_name="name", lookup_expr="icontains")
-    parent_uuid = UUIDFilter(field_name="parent__uuid", lookup_expr="exact")
+    parent_uuid = CharFilter(method="filter_parent_uuid")
     slug = CharFilter(field_name="slug", lookup_expr="exact")
 
     order_by = OrderingFilter(
@@ -264,7 +265,22 @@ class CategoryFilter(FilterSet):
 
     class Meta:
         model = Category
-        fields = ["uuid", "name"]
+        fields = ["uuid", "name", "parent_uuid", "slug"]
+
+    def filter_parent_uuid(self, queryset, name, value):
+        """
+        If ?parent_uuid= or ?parent_uuid=null, return items with parent=None.
+        Otherwise treat `value` as a real UUID and filter parent__uuid=value.
+        """
+        if value in ("", "null", "None"):
+            return queryset.filter(parent=None)
+
+        try:
+            uuid_val = uuid.UUID(value)
+        except (ValueError, TypeError):
+            return queryset
+
+        return queryset.filter(parent__uuid=uuid_val)
 
 
 class BrandFilter(FilterSet):

core/graphene/schema.py

@@ -184,7 +184,7 @@ class Query(ObjectType):
 
     @staticmethod
     def resolve_categories(_parent, info, **kwargs):
-        categories = Category.objects.filter(parent=None)
+        categories = Category.objects.all()
         if info.context.user.has_perm("core.view_category"):
             return categories
         return categories.filter(is_active=True)