problem is I want to input the reference field as its string representation 
nor as an integer

with this :

db.define_table('trux',
                Field('tuser', 'reference auth_user'))

db.trux.tuser.requires=IS_IN_DB(db, 'auth_user.id','%(username)s')

I get a string from a dropdown

howewer with the same requires in a list : 

db.trux.tuser.requires=[IS_IN_DB(db, 'auth_user.id','%(username)s')]

and obviously with the integer widget:

I cannot input a string because it brings up an error or is impossible

finally I did it with an onvalidation function but it checks 
strings(usernames) instead of number(ids) so not good

-- 
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