Ticket #18388: ticket_18338.2.diff

django/contrib/admin/options.py

@@ -1467 +1467 @@
             "fields": fields,
             "exclude": exclude,
             "formfield_callback": partial(self.formfield_for_dbfield, request=request),
-            "extra": self.extra,
-            "max_num": self.max_num,
+            "extra": self.get_extra(),
+            "max_num": self.get_max_num(),
             "can_delete": can_delete,
         }
         defaults.update(kwargs)
@@ -1519 +1519 @@
         return request.user.has_perm(
             self.opts.app_label + '.' + self.opts.get_delete_permission())
 
+    def get_extra(self):
+        return self.extra
+
+    def get_max_num(self):
+        return self.max_num
+
 
 class StackedInline(InlineModelAdmin):
     template = 'admin/edit_inline/stacked.html'