如何编写保存具有外键的模型的视图

我刚开始在Django开发,我有一个与ZipCode模型有关系的模型客户。所以从模型客户那里,我想得到zipcode模型中的zipcode。这样,zipcode模型有4个属性,如pk(aut_增量)、zipcode(唯一)、city(城市)和state(州)。因此,我的问题是:如何在客户模型中获取作为外键的zipcode属性,以及如何编写保存客户对象的视图?以下是客户和邮政编码模型:

class Customers(models.Model):
    customerID = models.CharField(max_length=15, unique=True)
    firstName = models.CharField(max_length=20)
    lastName = models.CharField(max_length=25)
    phoneNumber = models.CharField(max_length=14)
    zipCode = models.ForeignKey(ZipCode, on_delete=models.CASCADE)
    address = models.TextField()

class ZipCode(models.Model):
    zipCode = models.CharField(max_length=10, unique=True)
    city = models.CharField(max_length=30)
    state = models.CharField(max_length=25)
    def __str__(self):
        return self.zipCode + ' ' + self.city + ' ' + self.state

这里的视图还添加了不起作用的客户:

def add_Custmers(request):
    # try:
    #     zipCode=ZipCode.objects.get(slug=zipcode_slug)
    # except ZipCode.DoesNotExist:
    #     zipCode=None
    form=CustomersForm(request.POST or None)
    if form.is_valid():
        form.save()
    context = {'form': form}
    return render(request, 'customers.html', context

我附上了“添加客户”表以了解更多详细信息

class CustomersForm(forms.ModelForm):
    customerID = forms.CharField(max_length=15)
    firstName = forms.CharField(max_length=20)
    lastName = forms.CharField(max_length=25)
    phoneNumber = forms.CharField(max_length=14)
    zipCode = forms.ModelChoiceField(queryset=ZipCode.objects.all())
    address = forms.Textarea()
    class Meta:
        model=Customers
        fields=('customerID','firstName','lastName','phoneNumber', 'zipCode', 'address',)

上面是我定义的形式