Re: How to modify every element in a list all at once

Hi,

On Sun, Dec 16, 2007 at 10:08:14AM -0800, Greg wrote:
> 
> Forest,
> Here are my models
> 
> class Style(models.Model):
>     name = models.CharField(maxlength=200, core=True)
>     image = models.ForeignKey(Photo)
>     collection = models.ForeignKey(Collection,
> edit_inline=models.TABULAR, num_in_admin=1,
num_extra_on_change=3)
>     sandp = models.ManyToManyField(Choice)
> 
> class Choice(models.Model):
>     choice = models.ForeignKey(Collection,
edit_inline=models.TABULAR,
> num_in_admin=5)
>     size = models.ForeignKey(Size, core=True)
>     price = models.ForeignKey(Price, core=True)
>     orderdisplay = models.IntegerField()
> 
> class Price(models.Model):
>     name = models.DecimalField(max_digits=6,
decimal_places=2)
> 
>     def __str__(self,):
>         return str(self.name)

Why is Price a separate model?  That is going to make your
algorithm necessarily
more complicated.  You might have a good reason, but it's
not apparent to me.

This would be simpler:

class Choice(models.Model):
    ...
    price = models.DecimalField(max_digits = 6
decimal_places = 2)
    ...

Then you could use one of the algorithms that Ned and I
suggested.

-Forest
-- 
Forest Bond
http://www.alittletooq
uiet.net

> On Dec 16, 11:56 am, Forest Bond <for...alittletooquiet.net> wrote:
> > Hi,
> >
> > On Sun, Dec 16, 2007 at 08:37:08AM -0800, Greg
wrote:
> > > I've tried the following:
> >
> > > for s in s2:
> > >         s.price *= s.price * .9
> >
> > > However, I still get the following error:
> >
> > > TypeError at
/plush/chandra/antara/108/multi/
> > > unsupported operand type(s) for *: 'Price'
and 'float'
> >
> > Can you post your models, please?
> >
> > I take it price is a ForeignKey...
> >
> > -Forest
> > --
> > Forest Bondhttp://www.alittletooq
uiet.net