unique=True assures the value is unique at the database level but does not 
add a form validator.

In addition to unique=True, you can add a validator like this:

    db.person.username.requires = IS_NOT_IN_DB(db, 'person.username')

from the book:
http://web2py.com/books/default/chapter/29/07/forms-and-validators#IS_NOT_IN_DB



On Tuesday, April 19, 2016 at 2:32:15 AM UTC-4, mfarees...@gmail.com wrote:
>
> Field('username', unique=True)
>

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