On May 11, 7:08 pm, Malcolm Box <malcolm....@gmail.com> wrote: > Hi, > > I've run into a weird bug that has me scratching my head - I'm seeing > inconsistent results from a queryset between various apache processes and > the django shell. I.e. sometimes a GET gives me the right response (as it > hits a "correct" Apache instance) and other times it gives a wrong > response. Restarting Apache causes problem to go away, but it resurfaces > later. > > I have a Poll class which has a start_time and an end_time, both of which > are optional, plus an enabled field. A poll is considered active if it's > enabled, and if it has a start_time then now > start_time, and if it has an > end_time then now < end_time. > > What I'm seeing is that sometimes polls with a start_time that is before now > are not showing up in the responses when I do a series of GETs. So e.g. > first GET - shows poll, second one - doesn't show, third - doesn't, fourth - > does and so on. > > From a fresh python shell, the Poll.objects.active() call always gives the > right results. > > The code in question is: > > class PollManager(models.Manager): > def active(self): > qs = super(PollManager, self).get_query_set().filter(enabled=True) > q_start = Q(start_time__isnull=True) | > Q(start_time__lte=datetime.datetime.now()) > q_end = Q(end_time__isnull=True) | > Q(end_time__gte=datetime.datetime.now()) > return qs.filter(q_start,q_end) > > Where the models are is: > > class Event(models.Model): > enabled = models.BooleanField() # automatic default false > .... other fields > > class Poll(models.Model): > event = models.ForeignKey(Event, db_index=True) > enabled = models.BooleanField() # automatic default false > start_time = models.DateTimeField(blank=True, null=True, help_text="Time > to enable this poll (optional)") > end_time = models.DateTimeField(blank=True, null=True, help_text="Time > to close this poll (optional)") > > objects = PollManager() > > The view logic is basically: > > def view_polls(request, event_id): > filtered_set = self.queryset._clone() # Queryset is > Poll.objects.active().filter(event__enabled = True) > filtered_set = filtered_set.filter(event__id=event_id) > return render_to_response(template, filtered_set) > > (this has been elided and adapted - original code is using django-rest-api, > JSON responder etc. But the call boils down to this) > > I'm confused as to what the problem could be - any clues? > > Cheers, > > Malcolm
I'd like to see how the queryset is assigned to `self`. My suspicion would be that the arguments are being preserved across requests - when it's first instantiated, it correctly uses the current time to filter, but on subsequent calls it is still using the time as of the first request. -- DR. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@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.
