Hello,
Thanks for your reply Daniel, that along with setting ordering on the
Comic model seems to have fixed it.
Titus
On Dec 28, 9:55 am, Daniel Roseman <roseman.dan...@googlemail.com>
wrote:
> On Dec 28, 5:35 am, tsop <tso...@gmail.com> wrote:
>
>
>
> > Hey,
> > I'm quite new to django but I ran into a small problem maybe someone
> > can shed some light onto:
>
> > models.py
>
> > class Comic(models.Model):
> > title = models.CharField(max_length=80, help_text='Title of
> > comic.')
> > series = models.ForeignKey(ComicSeries, help_text='Which
> > series comic belongs to.')
> > image = models.ImageField(upload_to='tmp', help_text='A
> > comic.')
> > page_number = models.IntegerField(editable=False)
> > def __unicode__(self):
> > return "%s - %s" % (self.title, self.series)
>
> > def get_absolute_url(self):
> > #return "/comics/%s/?page=%d" % (self.series.slug,
> > self.page_number)
> > return "/comics/%s/%d" % (self.series.slug,
> > self.page_number)
>
> > def save(self):
> > if not self.page_number:
> > count = len(Comic.objects.filter
> > (series=self.series))
> > self.page_number = count + 1
>
> > super(Comic, self).save()
>
> > --------------------------------------
>
> > admin.py
>
> > class ComicInline(admin.StackedInline):
> > model = Comic
> > extra = 20
>
> > (Multi form uploading)
>
> > When saving a comic it should also save the right page number, the
> > reason I'm using my own page_numbers is because each comic belongs to
> > a series and if its the first in that series it should be page number
> > one, so we're not using comic id or anything.
>
> > It works for the most part, the page number increments as the comics
> > are saved, but when you start deleting previous comics and adding new
> > ones it doesn't save in the right order anymore.
>
> > All I really need to know is if there's a way we can make sure that
> > when multi form saves, it saves them in either the right order, or pre-
> > populates the page_number field with the right values.
>
> Instead of getting the total number of comics in the series, what you
> want to do is get the highest existing page number. This is one way to
> do it:
> Comic.objects.filter(series=self.series).order_by('-page_number')
> [0].page_number
>
> This just reverse-orders the comic series by page number, and takes
> the page_number from the first object - which will be the highest.
> --
> DR.
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