python - django 类型错误 : get() got multiple values for keyword argument 'invoice_id'

Question

我对 python 和 django 比较陌生，

我有以下 rest api View ，

class InvoiceDownloadApiView(RetrieveAPIView):
    """
    This API view will retrieve and send Terms and Condition file for download
    """

    permission_classes = (IsAuthenticated,)

    def get(self, invoice_id, *args, **kwargs):

        if self.request.user.is_authenticated():
            try:
                invoice = InvoiceService(user=self.request.user, organization=self.request.organization).invoice_download(
                invoice_id=invoice_id)
            except ObjectDoesNotExist as e:
                return Response(e.message, status=status.HTTP_404_NOT_FOUND)

            if invoice:
                response = HttpResponse(
                invoice, content_type='application/pdf')
                response['Content-Disposition'] = 'inline; filename={0}'.format(
                invoice.name.split('/')[-1])
                response['X-Sendfile'] = smart_str(invoice)
                return response
            else:
                return Response({"data": "Empty File"}, status=status.HTTP_400_BAD_REQUEST)

使用以下网址，

urlpatterns = [
    url(r'^invoice/(?P<invoice_id>[0-9]+)/download/$', views.InvoiceDownloadApiView.as_view()),

]

root url 格式如下，

url(r'^api/payments/', include('payments.rest_api.urls', namespace="payments")),   

当我调用端点时，

localhost:8000/api/payments/invoice/2/download/

出现如下错误，

TypeError at /api/payments/invoice/2/download/
get() got multiple values for keyword argument 'invoice_id'

无法弄清楚到底是什么导致了这个错误

Answer 1

View 方法的第一个参数(在 self 之后)始终是 request。按照您定义它的方式，请求作为 invoice_id 方法传入，而实际的 invoice_id 作为附加 kwarg 传入，因此出现错误。

像这样定义你的方法:

def get(self, request, invoice_id, *args, **kwargs):