Queryset chunker for values queries

values_queryset_chunker.py

def chunk_values_queryset(queryset, chunksize):
    if queryset.count() > 0:
        ending_pk = queryset.aggregate(Min('id'))['id__min'] - 1
        out = ['dummy']
        while len(out) > 0:
            out = list(queryset.filter(pk__gt=ending_pk).order_by('id')[:chunksize])
            if out:
                ending_pk = out[-1]['id']
                yield out