django-concurrency is an optimistic locking library for Django.

Tested with: 1.4.8, 1.5.4, 1.6b4, trunk.

It prevents users from doing concurrent editing in Django both from UI and from a django command.

sample code:

from concurrency.fields import IntegerVersionField

class ConcurrentModel( models.Model ):
    version = IntegerVersionField( )

Now if you try:

a = ConcurrentModel.objects.get(pk=1)
b = ConcurrentModel.objects.get(pk=1)
a.save()
b.save()

you will get a RecordModifiedError on b.save()

• Project home page: https://github.com/saxix/django-concurrency
• Issue tracker: https://github.com/saxix/django-concurrency/issues?sort
• Download: http://pypi.python.org/pypi/django-concurrency/
• Docs: http://readthedocs.org/docs/django-concurrency/en/latest/