Ticket #14082: patch_r16322.diff

django/forms/models.py

@@ -396 +396 @@
         '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 ##############################################################

tests/regressiontests/model_forms_regress/tests.py

@@ -4 +4 @@
 from django.core.exceptions import FieldError, ValidationError
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.forms.models import (modelform_factory, ModelChoiceField,
-    fields_for_model, construct_instance)
+    fields_for_model, construct_instance, ModelFormMetaclass)
 from django.utils import unittest
 from django.test import TestCase
 
@@ -460 +460 @@
         self.assertTrue(form.is_valid())
         instance = construct_instance(form, Person(), fields=())
         self.assertEqual(instance.name, '')
+
+
+class CustomMetaclass(ModelFormMetaclass):
+    def __new__(cls, name, bases, attrs):
+        new = super(CustomMetaclass, cls).__new__(cls, name, bases, attrs)
+        new.base_fields = {}
+        return new
+
+class CustomMetaclassForm(forms.ModelForm):
+    __metaclass__ = CustomMetaclass
+
+
+class CustomMetaclassTestCase(TestCase):
+    def test_modelform_factory_metaclass(self):
+        new_cls = modelform_factory(Person, form=CustomMetaclassForm)
+        self.assertEqual(new_cls.base_fields, {})