> > Your correct your solution Anthony works. > > Massimo, I am not sure I understand what db.auth_user.username. > requires.insert(0, MyStrangeRequirement()) is doing? >
Massimo's solution does the same thing but by creating a custom validator and adding the validator to the "requires" attribute of the "username" field. See http://web2py.com/books/default/chapter/29/7#Custom-validators. A custom validator can be more convenient because once it is added to the field it will automatically be applied to any SQLFORM (you don't have to set an onvalidation function for every SQLFORM), and it will also be applied when records are inserted via the .validate_and_insert() method (onvalidation functions don't apply in that case, as it doesn't involve any form processing). In this case, though, we only want the validation to happen with login, not with other forms or inserts/updates that may include the username field, so a custom validator probably doesn't have any advantage over an onvalidation function in this case. Anthony
