Changed the variable names to make it a little more readable. Method
now returns "amount" (formerly "total"):
Class Item(models.Model):
name = models.CharField(max_length=100)
price = models.DecimalField(max_digits=9, decimal_places=2)
quantity = models.IntegerField(default=1)
total_cost = models.DecimalField(max_digits=12,
decimal_places=2,
blank=True,
null=True,
editable=False)
def calc_total(self):
amount = (self.price * self.quantity)
return amount
def save(self):
self.total_cost = self.calc_total()
super(Item, self).save()
Now I get a different error when I try to save an Item:
OperationalError at /admin/spending/item/add/
(1054, "Unknown column 'total_cost' in 'field list'")
On Aug 25, 3:45 pm, nicksergeant <[EMAIL PROTECTED]> wrote:
> Should 'total_cost' simply:
>
> return total
>
> instead of:
>
> return total_cost(total)
>
> On Aug 25, 5:22 pm, Chris Amico <[EMAIL PROTECTED]> wrote:
>
> > This seems like it should be simple, but I'm getting errors.
>
> > I have a model tracking individual purchases. User inputs an item cost
> > and quantity; I want the total cost calculated. Here are the relevant
> > parts:
>
> > class Item(models.Model):
> > name = models.CharField(max_length=100)
> > price = models.DecimalField(max_digits=9, decimal_places=2)
> > quantity = models.IntegerField(default=1)
> > total_cost = models.DecimalField(max_digits=12,
> > decimal_places=2,
> > blank=True,
> > null=True,
> > editable=False)
>
> > def total_cost(self):
> > total = (self.price * self.quantity)
> > return total_cost(total)
>
> > def save(self):
> > self.total_cost = self.total_cost()
> > super(Item, self).save()
>
> > The error I get is:
>
> > NameError at /admin/spending/item/add/
> > global name 'total_cost' is not defined
>
> > Not sure what that means. Thoughts? Am I missing an exceedingly
> > obvious way to do this?
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