必填= False，不起作用Django Rest Framework序列化器

Question

我正在尝试更新userprofile实例。但是我没有在json中传递user_groups，它从我的user_groups字段中删除了所有外键。因此，我为此设置（尝试）-

if request.data.get('groups') == None:
                    print('Groups is None')
                    serializer2.instance.user_groups = userprofile.user_groups.all()

但是它给出了错误

  

直接分配给多对多集的正面是   禁止。请改用user_groups.set（）

这是我要求输入错误的行

groups = serializers.PrimaryKeyRelatedField(source='user_groups', queryset=Groups.objects.all(), many=True, required=False)

但是它不起作用

class EmployeeUpdateApiV2(APIView):

    def post(self, request, *args, **kwrgs):

        try:
            accesstoken=AccessToken.objects.get(
                        token=self.request.META.get('HTTP_AUTHORIZATION').replace('Bearer ', '')
                    )
        except ObjectDoesNotExist:
            return Response (
                {
                    "status" : False,
                    "error" : "Wrong Access Token",
                    "error_message":"You have provided wrong access token.",
                }
            )

        user_id = request.data['user_id'] 
        user = get_object_or_404(User, id=user_id)
        print(user)
        userprofile = get_object_or_404(UserProfile, user=user_id)
        print(userprofile)
        serializer1 = EmployeeRegisterSerializer(user, data=request.data)
        serializer2 = EmployeeProfileSerializerUpdate(userprofile, data=request.data)

        if serializer1.is_valid() and serializer2.is_valid():
            serializer1.save()

            if request.data.get('groups') == None:
                print('Groups is None')
                serializer2.instance.user_groups = userprofile.user_groups.all()

            serializer2.save()
            print('Inside Valid')
            return Response (
                    {
                        "status" : True,
                        "message":"Employee Updated Successfully.",
                        "api_name" : "EmployeeUpdateApiV2",
                        "result": serializer1.data,
                        "result1": serializer2.data,

                    }
                )
        print('Out Valid')
        print('serializer1 ', serializer1.errors)
        print('serializer2', serializer2.errors)
        return Response(status=status.HTTP_404_NOT_FOUND)

Serializer.py

class EmployeeProfileSerializerUpdate(serializers.ModelSerializer):
    employee_id = serializers.CharField(source='user_employee_id', required=False)
    payroll_id = serializers.CharField(source='user_payroll_id', required=False)
    phone = serializers.CharField(source='user_phone', required=False)
    hire_date = serializers.DateField(source='user_hire_date', required=False)
    pay_rate = serializers.IntegerField(source='user_pay_rate', required=False)
    salaried = serializers.CharField(source='user_salaried', required=False)
    excempt = serializers.CharField(source='user_excempt', required=False)
    state = serializers.CharField(source='user_state', required=False)
    city = serializers.CharField(source='user_city', required=False)
    zipcode = serializers.IntegerField(source='user_zipcode', required=False)
    status = serializers.CharField(source='user_status', required=False)
    groups = serializers.PrimaryKeyRelatedField(source='user_groups', queryset=Groups.objects.all(), many=True, required=False)

    class Meta:
        model = UserProfile
        fields = [  
                    'employee_id',
                    'phone', 
                    'payroll_id',
                    'hire_date',
                    'pay_rate',
                    'salaried',
                    'excempt',
                    'state',
                    'city',
                    'zipcode', 
                    'status',
                    'groups',

                ]