Question

我的模板中有一个按钮来更改/更新数据库中的ForeignKey对象。

但是，应更新的对象不会更改。

如何更新数据库中的ForeignKey对象？

Views.py 

   if 'order' in request.POST:
    status_change = request.POST['order']
    order = Order.objects.get(pk = status_change)

    if order.orderstatus.ORDERSTATUS == 'Received':
        order.orderstatus.ORDERSTATUS='Requested'
        order.save()
    elif order.orderstatus.ORDERSTATUS == 'Requested':
        order.orderstatus.ORDERSTATUS = 'Completed'
        order.save()
    elif order.orderstatus.ORDERSTATUS == 'Completed':
        order.orderstatus.ORDERSTATUS = 'Canceled'
        order.save()
    else:
        order.orderstatus.ORDERSTATUS = 'Received'
        order.save()

Models.py

RECEIVED = 'Received'
REQUESTED = 'Requested'
CANCELED = 'Canceled'
COMPLETED = 'Completed'

ORDER_STATUS = (
    (RECEIVED , 'Received'),
    (REQUESTED, 'Requested'),
    (CANCELED, 'Canceled'),
    (COMPLETED, 'Completed'),
)    

class Order(models.Model):
    orderstatus = models.OneToOneField(OrderStatus, on_delete=models.CASCADE)


class OrderStatus(models.Model):

    ORDERSTATUS = models.CharField(
        max_length = 10,
        choices = ORDER_STATUS,
        default = RECIEVED,
    )

Answer 1

order.orderstatus是它自己的数据库模型，而save不会跨越外键，所以你应该这样做：

order.orderstatus.save()

而不是：

order.save()

Django的。 ForeignKey对象不会更新/更改

1 个答案: