I  teste it on my web2py  it work 

Le vendredi 4 mars 2016 15:24:39 UTC+1, villas a écrit :
>
> Hi Eric,  Thanks for your interest.  I believe that this is a bug in 
> IS_IN_DB validator.  I am surprised that more users have not reported it.   
> Try this to replicate.
>
> 1. Make a new app.
> 2. Paste this at the bottom of models/db.py
>
>
> db.define_table('tag',
>     Field('name'),
>     Field('descr',length=50),
>     format='%(name)s',
>     )
>     
> db.define_table('docstore',
>     Field('name'),
>     Field('tags','list:reference tag'), 
>     )   
>     
> if not db(db.tag.id>0).count():
>     db.tag.insert( name = "A",  descr = "A Descr" )     
>     db.tag.insert( name = "B",  descr = "B Descr" )     
>     db.tag.insert( name = "C",  descr = "C Descr" )     
>
>
> Use Appadmin to add a record to docstore table.
>
>
>

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