Hi David, This should work:
db.participants.community_id.requires=IS_NOT_IN_DB(db
(db.participants.user==request.vars.user),db.table.community_id)
Just out of curiosity: why user and not user_id and why db.meeting and
not db.community?
db.define_table('participants',
Field('user_id',db.user),
Field('community_id',db.community),
Field('stuff'))
Kind regards,
Annet.
