i think you can use format or represent to achieve it.
e.g.
*somewhere in models after you define auth tables*
custom_auth_table = db[auth.settings.table_user_name]

custom_auth_table._format = '%(first_name)s %(last_name)s'

*controllers that have SQLFORM.factory that refer to auth_user table*
requires = IS_IN_DB(db, db.auth_user.id, db.auth_user._format)

best regards,
stifan

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