Did you update to latest Web2py?  I mean 'git pull'. 

On Friday, 4 March 2016 14:40:37 UTC, eric cuver wrote:
>
> 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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