From b59040815fd41ce4d8e6552ca563e205f9a9549c Mon Sep 17 00:00:00 2001
From: Birger Schacht <birger@rantanplan.org>
Date: Sat, 13 Jan 2024 21:20:09 +0100
Subject: [PATCH] fix: allow passing a filterset class to the filterset factory

---
 django_filters/filterset.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/django_filters/filterset.py b/django_filters/filterset.py
index 1d90db70..6ad099e8 100644
--- a/django_filters/filterset.py
+++ b/django_filters/filterset.py
@@ -458,9 +458,10 @@ class FilterSet(BaseFilterSet, metaclass=FilterSetMetaclass):
     pass
 
 
-def filterset_factory(model, fields=ALL_FIELDS):
-    meta = type(str("Meta"), (object,), {"model": model, "fields": fields})
-    filterset = type(
-        str("%sFilterSet" % model._meta.object_name), (FilterSet,), {"Meta": meta}
+def filterset_factory(model, filterset=FilterSet, fields=ALL_FIELDS):
+    attrs = {"model": model, "fields": fields}
+    bases = (filterset.Meta,) if hasattr(filterset, "Meta") else ()
+    Meta = type("Meta", bases, attrs)
+    return type(filterset)(
+        str("%sFilterSet" % model._meta.object_name), (filterset,), {"Meta": Meta}
     )
-    return filterset