Ticket #14082: modelform_factory_custom_metaclasses.diff

django/forms/models.py

@@ -404 +404 @@
         'formfield_callback': formfield_callback
     }
 
-    return ModelFormMetaclass(class_name, (form,), form_class_attrs)
+    form_metaclass = ModelFormMetaclass
 
+    if issubclass(form, BaseModelForm) and hasattr(form, '__metaclass__'):
+        form_metaclass = form.__metaclass__
 
+    return form_metaclass(class_name, (form,), form_class_attrs)
+
+
 # ModelFormSets ##############################################################
 
 class BaseModelFormSet(BaseFormSet):