DRF ModelSerialize只返回键

我在用 Django 1.5 和 Django休息框架2

我已经重写了 create 方法手动添加验证和返回响应。

我的观点是

class MultiUserCreateListView(generics.ListCreateAPIView):
    model = MultiUser
    serializer_class = MultiUserSerializer

    def get_queryset(self):
        users = MultiUser.objects.get_shared_users(user=self.request.user)
        return users

    def create(self, request, *args, **kwargs):
        email = request.DATA.get('email', None)
        access_level = request.DATA.get('access_level', None)
        name = request.DATA.get('name', None)

        user = User.objects.filter(email=email)
        if user:
            return  Response({'message': 'Email address already in use.'}, status=status.HTTP_400_BAD_REQUEST)

        serializer = self.get_serializer(data=request.DATA)

        new_user = create_active_user(request, self, email, email, password=None, is_shared=True)

        if new_user:
            if serializer.is_valid():
                multi_user_obj = MultiUser(
                    user=self.request.user,
                    shared_user=new_user,
                    access_level=access_level
                )
                multi_user_obj.save()

                serializer2 = MultiUserSerializer(data=multi_user_obj)
                return Response(serializer2.data, status=status.HTTP_201_CREATED)
        else:
            return Response({'message': 'Unable to create user. Try again'})

但是响应只包含键,对于在中定义的字段,该键的值为空。 MultiUserSerializer

{"id": "", "shared_user_name": "", "shared_user_email": "", "access_level": "", "invitation_sent_on": null, "invitation_accepted_on": null, "is_invitation_sent": "", "is_invitation_accepted": "", "created": null, "updated": null}

印刷时 print(multi_user_obj.id) 提供正确的ID。

为什么它不序列化?

编辑2:序列化程序

class MultiUserSerializer(serializers.ModelSerializer):
    shared_user_email = serializers.Field(source='shared_user.email')
    shared_user_name = serializers.Field(source='shared_user.first_name')
    is_invitation_sent = serializers.Field(source='is_invitation_sent')
    is_invitation_accepted = serializers.Field(source='is_invitation_accepted')

    class Meta:
        model = MultiUser
        fields = (
            'id', 'shared_user_name', 'shared_user_email',
            'access_level', 'invitation_sent_on', 'invitation_accepted_on',
            'is_invitation_sent', 'is_invitation_accepted',
            'created', 'updated'
        )