def create(self, request):
        request.data['owner'] = request.user.id
        request.data['created'] = datetime.now()

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

        if serializer.is_valid():
            d = serializer.validated_data

            existing = Objective.objects.filter(owner__id=self.request.user.id,
                                                year=d['year'],
                                                quarter=d['quarter'])

            num_existing = existing.count()

            # make sure the user doesn't already have 5 objectives
            if (num_existing >= 5):
                return Response(
                    'User already has 5 objectives this quarter',
                    status.HTTP_400_BAD_REQUEST
                )

            # set the Objective number as the next in line
            d['number'] = num_existing + 1

            e = serializer.save()
            return Response(serializers.ObjectiveSerializer(e).data)
        else:
            return Response(serializer.errors)