I've got an invoice model that foreign key's to a customer model, when
the invoice is saved I'm update a few fields in that related customer
model to make other code in my setup work. I keep getting
"unsupported operand type(s) for ** or pow(): 'Decimal' and
'NoneType'" whenever I try to save the foreignkey model:
class Customer(models.Model):
""" Customer Model """
customer_id = models.CharField(max_length=10)
customer_name = models.CharField(max_length=100)
slug = models.SlugField(unique=True)
outstanding_amount = models.DecimalField(editable=False,
default='0.00')
class CustomerInvoice(models.Model):
customer = models.ForeignKey(Customer,
related_name="customer_invoices")
invoice_id = models.CharField(max_length=10,
editable=False)
invoice_paid_date = models.DateField(blank=True, null=True)
invoice_total = models.DecimalField(max_digits=10, decimal_places=2,
editable=False, default='0.00')
def save(self):
if not self.invoice_paid:
self.customer.outstanding_amount = self.invoice_total
self.customer.save()
I'm thinking I'm looking too closely at something there where the
problem might be in the related model:
I'm missing something simple but what!? BTW these models are created
in separate apps if that makes any difference.
Thanks
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