在Django 2.0中，如何在generic.DeleteView中处理ProtectedError

我的一般观点声明如下：

class CustomerDelete(LoginRequiredMixin,DeleteView):

    model = models.Customer
    success_url = reverse_lazy('customer-list')

class Order(models.Model):

    Customer = models.ForeignKey(Customer, on_delete=models.PROTECT, default=None)
    Shop = models.ForeignKey(Shop, on_delete=models.PROTECT, default=None)
    Status = models.IntegerField(choices=STATUS);
    Reference = models.CharField(max_length=50)
    Date = models.DateTimeField(default=None)
    LastAuthorizationDate = models.DateTimeField(default=None, null=True)
    LastUpdated = models.DateTimeField(auto_now=True)
    def get_absolute_url(self):
        return reverse_lazy('order-view', None, [self.id])    

    def type(self):
        return 'Order'

    def Name(self):
        return self.Customer.Name + ' - ' + self.Shop.Name + ' - ' + self.Reference

以及声明如下的模型：

class CustomerDelete(LoginRequiredMixin,DeleteView):

    model = models.Customer
    success_url = reverse_lazy('customer-list')

class Order(models.Model):

    Customer = models.ForeignKey(Customer, on_delete=models.PROTECT, default=None)
    Shop = models.ForeignKey(Shop, on_delete=models.PROTECT, default=None)
    Status = models.IntegerField(choices=STATUS);
    Reference = models.CharField(max_length=50)
    Date = models.DateTimeField(default=None)
    LastAuthorizationDate = models.DateTimeField(default=None, null=True)
    LastUpdated = models.DateTimeField(auto_now=True)
    def get_absolute_url(self):
        return reverse_lazy('order-view', None, [self.id])    

    def type(self):
        return 'Order'

    def Name(self):
        return self.Customer.Name + ' - ' + self.Shop.Name + ' - ' + self.Reference

删除后，我得到以下异常：

位于/customer/2/delete/（“无法删除某些实例”）的ProtectedError 模型“Customer”的引用，因为它们是通过受保护的 外键：“Order.Customer”， ，，]>）

覆盖和捕获异常的最佳类方法是什么，它允许我重定向到附加了错误的引用者

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提前感谢。

要添加自定义逻辑，您需要覆盖

delete

方法：

class CustomerDelete(LoginRequiredMixin,DeleteView):

    model = models.Customer
    success_url = reverse_lazy('customer-list')
    error_url = reverse_lazy('customer-has-orders-error')

    def get_error_url(self):
        if self.error_url:
            return self.error_url.format(**self.object.__dict__)
        else:
            raise ImproperlyConfigured(
               "No error URL to redirect to. Provide a error_url.")

    def delete(self, request, *args, **kwargs):
            """
            Call the delete() method on the fetched object and then redirect. 
            """
           self.object = self.get_object()
           success_url = self.get_success_url()
           error_url = self.get_error_url()
           try:
                self.object.delete()
                return HttpResponseRedirect(success_url)
           except models.ProtectedError:
                return HttpResponseRedirect(error_url)

如果您打算经常使用它，您可以使用上述逻辑创建您自己的自定义混合

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此外，考虑在应用程序中实现软删除，这样记录不会立即从数据库中删除，而是在以后被标记为删除，一旦它们被归档。否则，您的业务逻辑可能会出现问题。

我遇到此错误：

与“customer has orders error”相反，但未找到任何参数。已尝试1个模式：…

。在我看来，我使用了DeleteView的URL。我可能做错了什么？