Ошибка при сериализации объекта QuerySet в Django Framework Rest

Question

Я пытаюсь сериализации мой queryset объект и получаю ошибку, как показано ниже,

Exception Type: AttributeError 
Exception Value:  
Got AttributeError when attempting to get a value for field `fullName` on serializer `UserSerializer`. 
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 'fullName'. 

Traceback

Environment: 


Request Method: POST 
Request URL: http://127.0.0.1:8000/user/crud/ 

Django Version: 1.9 
Python Version: 2.7.10 
Installed Applications: 
['rest_framework', 
'background_task', 
'userApp', 
'imageUpload', 
'django.contrib.admin', 
'django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.messages', 
'django.contrib.staticfiles'] 
Installed Middleware: 
['django.middleware.security.SecurityMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.middleware.common.CommonMiddleware', 
'django.middleware.csrf.CsrfViewMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware', 
'django.middleware.clickjacking.XFrameOptionsMiddleware'] 



Traceback: 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\django\core\handlers\base.py" in get_response 
    149.      response = self.process_exception_by_middleware(e, request) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\django\core\handlers\base.py" in get_response 
    147.      response = wrapped_callback(request, *callback_args, **callback_kwargs) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\django\views\decorators\csrf.py" in wrapped_view 
    58.   return view_func(*args, **kwargs) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\viewsets.py" in view 
    87.    return self.dispatch(request, *args, **kwargs) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\views.py" in dispatch 
    466.    response = self.handle_exception(exc) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\views.py" in dispatch 
    463.    response = handler(request, *args, **kwargs) 

File "C:\Users\JpG\Desktop\CYC_Heroku\userApp\views.py" in create 
    24.    return Response(data=serializer.data) # {"detail": "Mobile Number already exist"}) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\serializers.py" in data 
    503.   ret = super(Serializer, self).data 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\serializers.py" in data 
    239.     self._data = self.to_representation(self.instance) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\serializers.py" in to_representation 
    463.     attribute = field.get_attribute(instance) 

File "C:\Users\JpG\Desktop\herokuEnv\lib\site-packages\rest_framework\fields.py" in get_attribute 
    422.    raise type(exc)(msg) 

Exception Type: AttributeError at /user/crud/ 
Exception Value: Got AttributeError when attempting to get a value for field `fullName` on serializer `UserSerializer`. 
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 'fullName'. 

я в том числе код фрагмент здесь.
views.py

class UserView(viewsets.ModelViewSet): 
    queryset = UserModel.objects.all() 
    serializer_class = UserSerializer 

    def create(self, request, *args, **kwargs): 
      mobNum = request.data.get('mobileNum')   
      if UserModel.objects.filter(mobileNum=mobNum).exists():    
       serializer=UserSerializer(UserModel.objects.filter(mobileNum=mobNum)) 
       return Response(data=serializer.data) 

serializer.py

class UserSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = UserModel 
     fields = '__all__' 

models.py

class UserModel(models.Model): 
    fullName = models.CharField(max_length=100)  
    mobileNum = models.CharField(max_length=12) 
    isAuthority = models.BooleanField(default=False) 

Мой образец входного

На самом деле, я ожидал результат, похожий на выход ниже кода

class UserView(viewsets.ModelViewSet): 
    queryset = UserModel.objects.all() 
    serializer_class = UserSerializer 

    def create(self, request, *args, **kwargs): 
      serializer = self.get_serializer(data=request.data) 
      if serializer.is_valid(): 
       serializer.save() 
       return Response(data=serializer.data) 

Answer 1

попробовать get() вместо filter()
То есть, serializer=UserSerializer(UserModel.objects.get(mobileNum=mobNum))

Полный views.py

class UserView(viewsets.ModelViewSet): 
    queryset = UserModel.objects.all() 
    serializer_class = UserSerializer 

    def create(self, request, *args, **kwargs): 
      mobNum = request.data.get('mobileNum')   
      if UserModel.objects.filter(mobileNum=mobNum).exists():    
       serializer=UserSerializer(UserModel.objects.get(mobileNum=mobNum)) 
       return Response(data=serializer.data)