The direct solution would be something like this in your view
events = Event.objects.order_by('event_date')
event_tuples = []
last_date_seen = None
for event in events:
if last_date_seen:
date_difference = event.date - last_date_seen
else:
date_difference = None
event_tuples.push((event, date_difference))
(date_difference would be a timedelta object)
On Sat, Feb 7, 2015 at 10:02 PM, Lachlan Musicman <data...@gmail.com> wrote:
> My initial suggestion would be to utilise the "order by" option, and
> order by date.
>
> Then, on each model have a find_next function and a until_next function.
>
> The first would work out which was the next event, the other the time.
> They could be coupled, but keeping them separate means you can utilise
> them later if you need to.
>
> cheers
> L.
> ------
> "This is a profound psychological violence here. How can one even
> begin to speak of dignity in labor when one secretly feels one's job
> should not exist?"
>
> On the Phenomenon of Bullshit Jobs, David Graeber
> http://strikemag.org/bullshit-jobs/
>
>
> On 8 February 2015 at 09:40, Richard Bowden <r...@rdbg.co.uk> wrote:
> > Got an problem that I am struggling to solve..
> >
> > I have:
> >
> > class Address(models.Model):
> > name = models.CharField()
> > event_date = models.DateTime()
> >
> >
> > event1, 25/01/2015
> > event2, 27/01/2015
> > event3, 05/02/2015
> >
> > and so on…
> >
> > what I am trying to figure out is, how to calculate the days between each
> > event.
> >
> > so event2, would be 2 days, event3 would be 9 days etc.
> >
> > want to end up with something like this that is passed to the template
> > event1, 25/01/2015
> > event2, 27/01/2015, 2
> > event3, 05/02/2015, 9
> >
> >
> > its the mechanics I am having trouble working out, my initial though was
> to
> > have a def on the model that accepted a datetime object. Somehow in a
> loop i
> > would get the diatomite from the next event and pass it in and calc days
> on
> > self.event_date… cant think how to do it.
> >
> > has anyone else needed something like this? or am I thinking about it
> > wrong..
> >
> > Thanks
> >
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