我需要在REST框架中更新我的用户

views.py

class UserUpdate(APIView):

permission_classes = (permissions.IsAuthenticated,)

def post(self,request):

user=User.objects.get(id=request.user.id)

try:

user_serializer=UserSerializer(request.user,data=request.data, partial=True)

if user_serializer.is_valid():

user_serializer.save()

return Response(user_serializer.data, status=status.HTTP_201_CREATED)

else:

return Response(user_serializer.errors, status=status.HTTP_400_BAD_REQUEST)

except:

return JsonResponse({'status':0,'message':'Error on user update'})

serializers.py

class UserSerializer(serializers.ModelSerializer):

class Meta:

model = User

fields = ['id', 'first_name', 'last_name', 'avatar']

models.py

class User(AbstractUser):

fb_userid = models.CharField(max_length=256)

avatar = models.ImageField(upload_to='avatars/', blank=True, null=True)

响应：

详细信息：密钥(用户名)=()已存在.