get_queryset method and ViewSets in django rest framework

I am doing exactly as the example states

here is my method

class FeedViewSet(viewsets.ModelViewSet):
    model = Feed
    serializer_class = FullFeedSerializer

    def get_queryset(self):
        user = request.user
        queryset = Feed.objects.get_nearby(user)
        return queryset

when i execute it, it says request not defined .. which actually isn't. the example at the rest framework's site also haven't defined request. what am i doing wrong?