Question

我是Django的新手，遇到了问题。我在商品模型中有一个方法：

@transaction.atomic
def payment(self):
    if self.owner.balance > self.price and self.active is False:
        self.act_time_till = now() + timedelta(days=1)
        self.owner.balance -= self.price
        # here i need to create a new Invoice object
        self.save()
        return True
    else:
        return False

我有一个不同的模型 - 发票：

class Invoice(models.Model):
    commodity = models.ForeignKey(Commodity, on_delete=models.PROTECT)
    paid_till = models.DateTimeField(blank=False, null=False)
    value = models.DecimalField(max_digits=3, decimal_places=2, blank=False, null=False)

每次付款时如何创建发票实例？谢谢！

Answer 1

# considering that you have invoice object available in the module. If not then you
# need to import it first.
Invoice.objects.create(commodity=self, paid_till=self.act_paid_till, value=self.price)

Answer 2

你可以在这个方法中调用。

@transaction.atomic
def payment(self):
   if self.owner.balance > self.price and self.active is False:
     self.act_time_till = now() + timedelta(days=1)
     self.owner.balance -= self.price
     # here i need to create a new Invoice object
     self.save()
     ## After this line you can create invoice object instance
     Invoice.objects.create(commodity=self, paid_till=self.act_paid_till, value=self.price)  
    return True
   else:
     return False

从方法创建模型实例

2 个答案: