I have a table as follows:
db.define_table(
'participants',
Field('user'),
Field('community_id',db.meeting)
Field('stuff')
)
db.participants.community_id.requires = IS_IN_DB(db,'community.id')
What I want to do is require that the user be represented for a given
community only once. Something like the below which obviously does
not work
db.participants.user.requires.IS_NOT_IN_DB('participants',user
+community)
Is this possible without a custom validator?
