You should read the section on database validators ....
http://web2py.com/books/default/chapter/29/07/forms-and-validators#Database-validators
you can either use the _and argument of IS_IN_DB, but more easily for
everybody, e.g. there's not even a chance they can select an ip that is
used yet, you can just pass a set instead of the whole table to IS_IN_DB...
db(~db.ipaddress.id.belongs(db(db.server.id>0)._select(db.server.ipaddress_id)))
On Saturday, April 25, 2015 at 5:28:16 PM UTC+2, kecajk...@gmail.com wrote:
>
> Hi Guys,
>
> I have simple database:
>
> db.define_table('ipaddress',
> Field('ip', unique=True, length=200),
> Field('subnet', length=200),
> format = '%(ip)s')
>
> db.define_table('server',
> Field('servername', length=200),
> Field('port', length=200),
> Field('ipaddress_id', 'reference ipaddress'))
>
> I have few records in ipaddress table and not would like to add some
> validators.
> When adding record to server table i would like to check if ipaddress_id
> exist in ipaddress table AND if it hasn't been used before in server table.
> That can be done by doing:
>
> db.server.ipaddress_id.requires = IS_IN_DB(db,db.ipaddress.id, '%(ip)s')
> ,IS_NOT_IN_DB(db,db.server.ipaddress_id, '%(ip)s')]
>
> But in that case Filed server.ipaddress_id is not a dropdown menu and it's
> not presented as %(ip)s. I would like to have dropdown to choose IP
> available in ipaddress table, but just the one which hasn't been used
> before. Any tips?
>
> Thanks,
>
>
--
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