Hi, I want something similar to the transaction middleware but even more fine grained.
I'd like to delay certain operations on a model instance while another is occurring ... like a mutex really. Imagine a model of a user's karma: class Karma( model.Models ): user = models.ForeignKey( User ) karma = models.IntegerField() You can do operations that add and subtract single karma points, and also "cash out" on karma. I'd love to prevent cashout, upmod, & downmod from happening at the same instant. Polling a value in the DB (and eventually polling a value in memcached), might be a way to go: class KarmaLock (model.Models): karma = models.ForeignKey( Karma ) locked = models.BooleanField() start any operation like this: karma = # some karma record while KarmaLock.objects.filter(karma=karma)[0].locked: # busy loop is bad, sleeping might be worse pass KarmaLock.objects.filter(karma=karma)[0].locked = True Is the transaction middleware enough to invalidate the need for this? Is there some DB call in the django DB api that allows for this? Thanks! Ivan --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
