i think it's can be done by record representation format, either in table 
format or in requires validation format representation. (the 
table bursary_entries just save the id for that refered to bursary_users, 
but it will shown the barcode, if you set the format correctly either in 
table format or requires validation)
ref:
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#format--Record-representation

best regards,
stifan
>
>

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