use clean method and use self.instance.fieldname to know previous value and then compare with the new value.
On Fri, Jul 24, 2009 at 10:50 PM, Tim Chase <django.us...@tim.thechases.com>wrote: > > >> How can I tell which model fields have been modified (this is, the > >> difference between the Model instance and the data originally retrieved > >> from the database) from inside the model's save() method? > > > > You can always retrieve the model by it's primary key from the db, and > > then compare self to it. Something like: > > > > def save(stuff_and_junk): > > existing_instance = self.__class__.objects.get(id=self.id) > > if existing_instance.attribute != self.attribute: > > print 'Holy Crap!' > > super(self.__class__, self).save(stuff_and_junk) > > Remembering, of course, that get() can throw an exception if > you're creating a new object... > > -tim > > > > > > --~--~---------~--~----~------------~-------~--~----~ 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 django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
