Django rest framework. If user exist return True, False if not

Question

Need to preform simple check: If user exist return True, False if not.I am trying to solve thise problem using custom json answers, not sure it is the right way to deal with it. Please help me .

My serializer:

User = get_user_model()

Class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = (User.USERNAME_FIELD, )

My views:

@api_view(['GET'])
def UserViewSet(self, request):
    if request.method == 'GET':
        try:
            user = User.objects.get(username=User.USERNAME_FIELD)
            if User.DoesNotExist:
                json = {}
                json['message']= 'False'
                return Response(json)
            else:
                json = {}
                json['message']= 'True'
                return Response(json)

Please explain what you are trying to do in this line User.objects.get(username=User.USERNAME_FIELD). — Rahul Gupta
– Rahul Gupta, Commented Apr 16, 2016 at 17:26
Also, you can use RetrieveAPIView to decide if object exists or not. If 404 status code is returned, it means user does not exist. Otherwise 200 status code will be returned — Rahul Gupta
– Rahul Gupta, Commented Apr 16, 2016 at 17:33
But this query will always be User.objects.get(username='field_name'). How will this retrieve intended unique user? — Rahul Gupta
– Rahul Gupta, Commented Apr 16, 2016 at 17:38
the thing is i should get True or False insetead of 404 or 200 exceptions. — Deeps HIT
– Deeps HIT, Commented Apr 16, 2016 at 17:45

Hakim · Accepted Answer · 2017-08-24 19:42:29Z

5

Instead of using UserViewSet and UserSerializer, you can just use APIView for that.

class UserExistsView(APIView):

    def get(self, request, *args, **kwargs):
        # use this if username is in url kwargs
        username = self.kwargs.get('username') 

        # use this if username is being sent as a query parameter
        username = self.request.query_params.get('username')  

        try:
            user = User.objects.get(username=username) # retrieve the user using username
        except User.DoesNotExist:
            return Response(data={'message':False}) # return false as user does not exist
        else:
            return Response(data={'message':True}) # Otherwise, return True

edited Aug 24, 2017 at 19:42

Hakim

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answered Apr 16, 2016 at 17:59

Rahul Gupta

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5 Comments

Deeps HIT Over a year ago

how in this case query should look like? User.objects.get(self.kwargs['username']) ?

Rahul Gupta Over a year ago

How are you sending the username of a particular user? Is it in url kwargs or as a query parameter?

Deeps HIT Over a year ago

regular i use next contruction to return some filtered data - def get_queryset(self): user = self.kwargs['username'] return User.objects.filter[username=user]

Rahul Gupta Over a year ago

Updated the ans with 2 options to get the username and then perform a lookup based on it.

Muteshi Over a year ago

I this is very old...but i tried this but i am getting empty response using apisauce. i have asked the question here.Kindly assist stackoverflow.com/questions/64624712/…

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