@Override
public MorphiaIterator<T, T> fetchEmptyEntities(final FindOptions options) {
QueryImpl<T> cloned = cloneQuery();
cloned.getOptions().projection(new BasicDBObject(Mapper.ID_KEY, 1));
cloned.includeFields = true;
return cloned.fetch();
}
@Override
public MorphiaKeyIterator<T> fetchKeys(final FindOptions options) {
QueryImpl<T> cloned = cloneQuery();
cloned.getOptions().projection(new BasicDBObject(Mapper.ID_KEY, 1));
cloned.includeFields = true;
return new MorphiaKeyIterator<T>(
ds, cloned.prepareCursor(options), ds.getMapper(), clazz, dbColl.getName());
}