Django：更新 foreign_keys

Question

在我的项目流程中，我首先在订单中创建一个数据库条目。此时，foreign_key transaction_profile 保持为空。稍后在我的 checkout_page 视图中，创建了 transaction_profile get。

发生 transaction_profile.save() 后，我想将新创建的 Transaction_Profile 与 Order.objects.filter(order_id=request.session[ 'order_id']）。

我现在真的很难完成这件事。这里的任何人都可以帮助我找到正确的曲目吗？

结帐 > views.py

def checkout_page(request):

    if request.POST:
        transaction_profile = TransactionProfileModelForm(request.POST)
        if transaction_profile.is_valid():
            transaction_profile.save()

            o = Order.objects.filter(order_id=request.session['order_id'])
            #if qs.count() == 1:
            o.transaction_profile.add(transaction_profile)

    else:
            transaction_profile = TransactionProfileModelForm()

        context = {
            'transaction_profile': transaction_profile,
        }
[...]

交易 > models.py

class TransactionProfile(models.Model):
    email           = models.EmailField()
    address_line_1  = models.CharField(max_length=120)
    address_line_2  = models.CharField(max_length=120, null=True, blank=True)
    city            = models.CharField(max_length=120)
    country         = models.CharField(max_length=120)
    state           = models.CharField(max_length=120)
    postal_code     = models.CharField(max_length=120)
    update          = models.DateTimeField(auto_now=True)
    timestamp       = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.email

订单 > models.py

class Order(models.Model):
    order_id                = models.CharField(max_length=10, unique=True)
    updated                 = models.DateTimeField(auto_now=True)
    timestamp               = models.DateTimeField(auto_now_add=True)
    transaction_profile     = models.ForeignKey(TransactionProfile, blank=True, null=True, on_delete=models.CASCADE)

Answer 1

您必须先保存实例并将其分配给 Order 对象：

if request.POST:
    transaction_profile = TransactionProfileModelForm(request.POST)
    if transaction_profile.is_valid():
        instance = transaction_profile.save(commit=False)
        instance.save()

        o = Order.objects.get(order_id=request.session['order_id'])
        o.transaction_profile = instance
        o.save()

Django：更新 foreign_keys

Django: Updating foreign_keys

django

foreign-keys

models