> > Any chance that I can do
>
> > db.mytest.person.requires=IS_NULL_OR(IS_ALPHANUMERIC(), IS_IN_DB(db,
> > 'dogs.dog_name',
> >                                                                 '%
> > (dog_name)s'))
>
> > where IS_IN_DB could also be IS_IN_SET.
>
> Not currently, IS_NULL_OR has two parameters: other (a validator) and
> null (the value returned on null imput).

Not but you can do

db.mytest.person.requires=[IS_ALPHANUMERIC(),IS_NULL_OR(IS_IN_DB
(db,'dogs.dog_name', (dog_name)s'))]

and I believe this is equivalent to what you want, except that it will
not display the dropbox without creating a custom widget to handle it.

Massimo
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