mindsnacks/django-versionfield — pull request #2 by hoddez (2013-03-15 00:16:45+00:00)
Title: Admin Support for VersionFields

Needed to do a custom form field because the validation on IntegerField (super class) was throwing errors when you tried to pass in a string.

forms.VersionField subclasses django.forms.IntegerField and overrides to_python to verify that the value passed in from admin can be converted to a Version object