In that case you have to pass a set instead of db to IS_IN_DB look in the book it clear...
Richard On Wed, Nov 2, 2011 at 11:55 AM, Bianca Cadaveri <[email protected]>wrote: > Thank you very much ! > > Could I also ask if it is possible to forbid one specific value for a > field ? > > BC > > > > On 2 nov, 15:45, Anthony <[email protected]> wrote: > > You can try IS_EMPTY_OR(IS_IN_DB(...)) (also works with IS_IN_SET). You > > might also want to specify a 'zero' option. > > Seehttp://web2py.com/book/default/chapter/07#Validators. > > > > > > > > > > > > > > > > On Wednesday, November 2, 2011 10:35:26 AM UTC-4, Bianca Cadaveri wrote: > > > > > Hello, > > > > > I would like my users to be able to choose nothing, if they want to, > > > in a drop-down menu. The drop-down menu is generated using SQLFORM. > > > By default the validator does not accept that my users choose nothing. > > > How to change that ? > > > > > Thank you very much, > > > Bianca >
