hi Julien
that makes perfect sense and looks much better than auto_now. always good to
avoid deprecated stuff.
thanks a lot
André
On Mon, Jul 21, 2008 at 6:26 AM, Julien Phalip <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> The declarative attribute 'auto_now' (as well as 'auto_now_add') is
> deprecated and its support will eventually be dropped. To achieve that
> you need to override the 'save' method. In that same method you can
> also call the parent's 'save' method to propagate the change to the
> ancestors:
>
> ModelA(models.Model):
> modified = models.DateTimeField()
> parent = models.ForeignKey('self', related_name='children',
> null=True,
> blank=True)
>
> def save(def):
> self.modified = datetime.now()
> if self.parent:
> self.parent.save()
> super(ModelA, self).save()
>
> On Jul 20, 6:28 pm, "Andre Meyer" <[EMAIL PROTECTED]> wrote:
> > hi all
> >
> > i have a model with a modifed field
> >
> > modified = models.DateTimeField(auto_now=True)
> >
> > and a parent field
> >
> > parent = models.ForeignKey('self', related_name='children', null=True,
> > blank=True)
> >
> > in order to allow for creating a tree of items.
> >
> > what is the best way to propagate a modification in a child to set all
> its
> > parents to the same modification time?
> >
> > or is it possible to sort a query set that retrieves only the top-most
> items
> > (parent=None) on the latest modification time of its children? maybe
> using a
> > method that calculates and returns that date on the fly?
> >
> > thanks a lot for your help
> > André
> >
> > using trunk 8004, full code is
> > here<http://code.google.com/p/pastiche/source/browse>
> > .
> >
>
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