Ok, I've fixed it now. Instead of trying to save the value, I show
the value on my list page:
def num_leafs(self):
return self.leaf_set.count()
num_leafs.short_description = "Number of Leafs"
Thanks for your help anyway.
On Dec 1, 2007 3:40 PM, Tane Piper <[EMAIL PROTECTED]> wrote:
> Hi Simon,
>
> Ok - I checked that out, but I'm still unsure on something, in that
> example you have self.thread within in the Reply save. I've tried
> applying the same way to my model like this:
>
> def save(self):
> if not self.slug:
> self.slug = slugify(self.title)
> super(Leaf, self).save()
> self.branch.num_leafs = self.branch.leaf_set.count()
> self.branch.save()
> def delete(self):
> super(Leaf, self).delete()
> self.branch.num_leafs = self.branch.leaf_set.count()
> self.branch.save()
>
> However, 'Leaf' object has no attribute 'branch' is the error I get.
> I'm assuming i probably need to set self.branch, I tried this:
>
> self.branch = Branch(pk = self.content_type)
>
> however I get this error: Incorrect integer value: 'Pages' for column
> 'content_type_id' at row 1, so obviously it's passing in the text
> version of content type, and not the id. Any ideas?
>
>
> On Dec 1, 2007 3:15 AM, Simon Willison <[EMAIL PROTECTED]> wrote:
> >
> > On Nov 30, 4:48 pm, "Tane Piper" <[EMAIL PROTECTED]>
> > wrote:
> > > As you can see in the Branch model, there is a field called num_leafs
> > > - I've been reading the signals documentation and had a look on the
> > > web, but I'm still having difficulty getting my head around it. What
> > > I want to do is when a leaf is saved, on the post_save signal I want
> > > to increment the parent branch's num_leafs field so it contains total
> > > number of content leafs for that branch (as a counter cache).
> >
> > This exact example was covered in the Advanced Django Tutorial at
> > OSCON this year (in the unit testing section) - you may find the
> > slides from the tutorial useful:
> >
> > http://toys.jacobian.org/presentations/2007/oscon/tutorial/
> >
> > Cheers,
> >
> > Simon
> > > >
> >
>
>
>
>
> --
> Tane Piper
> Blog - http://digitalspaghetti.me.uk
> AJAX Pastebin - http://pastemonkey.org
>
> This email is: [ ] blogable [ x ] ask first [ ] private
>
--
Tane Piper
Blog - http://digitalspaghetti.me.uk
AJAX Pastebin - http://pastemonkey.org
This email is: [ ] blogable [ x ] ask first [ ] private
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