please use format as record representation or set it on IS_IN_DB form
validation.
e.g. if you want to show city as a drop down menu in order_bus form :
db.define_table(
'route',
Field('city'),
Field('country_iso'), format = '%(city)s')
db.order_bus.depart_from.requires = IS_IN_DB(db, 'route.id', '%(city)s', zero
= T('choose one'))
db.order_bus.arrive_to.requires = IS_IN_DB(db, 'route.id', '%(city)s', zero
= T('choose one'))
ref:
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Record-representation
http://web2py.com/books/default/chapter/29/07/forms-and-validators#Database-validators
best regards,
stifan
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