如何從 serializer.data Django Rest 框架返回空查詢集

Question

視圖.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)

序列化程序.py

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

我希望序列化程序在用戶 Model 中沒有用戶 DoesNotExist 時返回空響應，但是我收到以下錯誤。 我怎樣才能做到這一點？

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

您正在嘗試序列化查詢集，因此您需要將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)