如何从 serializer.data Django Rest Framework 返回空查询集

Question

view.py

class User_ListView(APIView):
    permission_classes = [DjangoCustomModelPermissions]
    queryset = User.objects.none()

    def get(self, request):
        param1 = request.query_params.get('param1',None) 
        param2 = request.query_params.get('param2',None)

        try:
            db_data = User.objects.get(param1 = param1, param2=param2)
            serializer = User_Serializer(db_data)
            return Response(serializer.data)
        except Closing_Stock_List_Trans.DoesNotExist:
            db_data = User.objects.none()
            serializer = User_Serializer(db_data)
            return Response(serializer.data)

serializer.py

class User_Serializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = '__all__'

我希望序列化程序在用户模型中没有 User DoesNotExist 时返回空响应，但是我收到以下错误。我怎样才能做到这一点？

AttributeError: Got AttributeError when attempting to get a value for field `param1` on serializer `User_Serializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `QuerySet` instance.
Original exception text was: 'QuerySet' object has no attribute 'param1'.

Answer 1

您正在尝试序列化查询集，因此您需要将many=True 添加到序列化中。

....
except Closing_Stock_List_Trans.DoesNotExist:
    db_data = User.objects.none()
    serializer = User_Serializer(db_data, many=True)
    return Response(serializer.data)