class UserRetrieveAPIView(RetrieveAPIView):
    serializer_class = ReadUserSerializer

    def retrieve(self, request, *args, **kwargs):
        data = {request.GET.get('field'): request.GET.get('value')}
        user = User.objects.filter(**data)
        serializer = self.get_serializer(user, many=True)
        return Response(serializer.data)