Skip to main content

Optimistic lock implementation for Django. Prevents users from doing concurrent editing.

Project description

django-concurrency is an optimistic lock [1] 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.

How it works

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()

Similar projects

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

Project details


Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page