Ticket #16479: 16479-formset-forms-error_class.diff

django/forms/formsets.py

@@ -111 +111 @@
         """
         Instantiates and returns the i-th form instance in a formset.
         """
-        defaults = {'auto_id': self.auto_id, 'prefix': self.add_prefix(i)}
+        defaults = {
+            'auto_id': self.auto_id,
+            'prefix': self.add_prefix(i),
+            'error_class': self.error_class,
+        }
         if self.is_bound:
             defaults['data'] = self.data
             defaults['files'] = self.files