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: 1.8.x, 1.9.x, 1.10.x., 1.11.x
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
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_list-editable: https://django-concurrency.readthedocs.org/en/latest/admin.html#list-editable
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