On Oct 5, 3:11 am, Daniel Roseman <dan...@roseman.org.uk> wrote: > On Wednesday, 5 October 2011 01:27:54 UTC+1, eyscooby wrote: > > > new to django/python developement, can't get this one figured out. > > > I have a model that has a couple DateFields (issued_date & > > completion_date), and I'm trying to return a value with the difference > > of the two on each entry that is complete, and then if it isn't > > completed yet, show the amount of days since it was issued. > > I am using the Admin interface and what I have in the model is > > this.... > > > models.py > > class RequestTicket(models.Model): > > . . . > > issued_date = DateField() > > completed_date = DateField(blank=True, null=True) > > > def days_old(self): > > complete = RequestTicket.object.filter(completion_date__isnull=False) > > for ticket in complete: > > return ticket.completion_date - ticket.issued_date > > return date.today() - self.issued.date > > days_old.short_discription = 'Days Old' > > > what i get returned is if the first entry was completed within 2 days > > (issued=9/14, completed=9/16), all entries after that get 2 days, even > > if there is no completion date. > > If i use 'self.object.filter(completion_date__isnull=False)', I get a > > NONE answer on all entries > > If I don't filter for just completed entries I get an error trying to > > subtract NoneType field with DateField, i guess that might be from the > > NULL setting. > > Any help, advice would be great, or if i need to post in another area. > > > Django version 1.2 > > > thanks > > Kenney > > OK, there are a few things wrong with your `days_old` function. > > Firstly, it operates on a queryset, not an instance, so it should be a > method of the Manager, not the Model. > > Secondly, you can't return multiple times like that. You can only return > once from a function. You need to build up a list of values, and return that > - or set the attribute on each element of the queryset. > -- > DR.- Hide quoted text - > > - Show quoted text -
DR. would creating a manager something like this work with a list?? class RequestTicketManager(models.Manager): def datecalc(self): complete_list = list(self.objects.filter(competion_date__isnull=False)) for day in complete_list: return day.competion_date - day.issued_date I then put "objects = RequestTicketManager()" in my model thanks for you help, -- 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.
