django-concurrency is an optimistic lock1 implementation for Django.
Supported Django versions: 1.6.x, 1.7.x, 1.8.x, 1.9.
It prevents users from doing concurrent editing in Django both from UI and from a django command.
sample code:
from django.db import models
from concurrency.fields import IntegerVersionField
class ConcurrentModel( models.Model ):
version = IntegerVersionField( )
name = models.CharField(max_length=100)
Now if you try:
a = ConcurrentModel.objects.get(pk=1)
a.name = '1'
b = ConcurrentModel.objects.get(pk=1)
b.name = '2'
a.save()
b.save()
you will get a RecordModifiedError
on b.save()
Other projects that handle concurrent editing are django-optimistic-lock and django-locking anyway concurrency is "a batteries included" optimistic lock management system, here some features not available elsewhere:
- can be applied to any model; not only your code (ie. django.contrib.auth.Group)
- handle list-editable ChangeList. (handle #11313)
- manage concurrency conflicts in admin's actions
- can intercept changes performend out of the django app (ie using pgAdmin, phpMyAdmin, Toads) (using TriggerVersionField)
- can be disabled if needed (see disable_concurrency)
- ConditionalVersionField to handle complex business rules
Stable | |||
Development | |||
Project home page: | https://github.co | m/saxix/django- | concurrency |
Issue tracker: | https://github.co | m/saxix/django- | concurrency/issues?sort |
Download: | http://pypi.pytho | n.org/pypi/djan | go-concurrency/ |
Documentation: | https://django-co | ncurrency.readt | hedocs.org/en/latest/ |
_list-editable: https://django-concurrency.readthedocs.org/en/latest/admin.html#list-editable