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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