Yes. It is possible to validate dependent fields as if you have a
multi-column index.
An example was discussed here:
http://groups.google.com/group/web2py/browse_thread/thread/7551b50ef3ca72a8/c48d7a410993daac?lnk=gst&q=IS_NOT_IN_DB#c48d7a410993daac

Massimo

On Jan 8, 8:29 pm, ionel <ionelanton...@gmail.com> wrote:
> IS_NOT_IN_DB validate a single field, not multiple fields together. I
> think is not possible to make a composite index in web2py.
>
> Thanks anyway
>
> ionel
>
> On Jan 7, 11:22 pm, "Wes James" <compte...@gmail.com> wrote:
>
> > Look at IS_NOT_IN_DB
>
> > -wj
>
> > On Wed, Jan 7, 2009 at 9:01 PM, ionel <ionelanton...@gmail.com> wrote:
>
> > > Hello everybody,
>
> > > I am writing an application for a personal library. But now I need to
> > > build a multiple field index because I don't want   duplicate records
> > > in my database. Can I do this with web2py?
>
> > > Thanks
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