Fixes: CaseInsensitiveListFilter

core/filters.py

@@ -24,13 +24,22 @@ logger = logging.getLogger(__name__)
 
 class CaseInsensitiveListFilter(BaseInFilter, CharFilter):
     def filter(self, qs, value):
-        if value:
-            lookup = f"{self.field_name}__icontains"
-            q_objects = Q()
-            for v in value:
-                q_objects |= Q(**{lookup: v})
-            qs = qs.filter(q_objects)
-        return qs
+        if not value:
+            return qs
+
+        if isinstance(value, str):
+            values = [v.strip() for v in value.split(',') if v.strip()]
+        else:
+            values = [v for v in value if v]
+
+        if not values:
+            return qs
+
+        q = Q()
+        for v in values:
+            q |= Q(**{f"{self.field_name}__iexact": v})
+
+        return qs.filter(q).distinct()
 
 
 class ProductFilter(FilterSet):