[web2py] Is there a more efficient way to do this?

[weheh]

I have a multilist that I want to populate from db.table:

    rows=db(query).select(db.table.id,db.table.name)

    db.table.multilist_field.requires=IS_IN_SET(
        [r.id for r in rows],
        labels=[r.name for r in rows],
        )

Is there a better, more efficient way to do this rather than having to
run through the rows list twice?