Check this
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer?search=computed+field#Computed-fields
sexta-feira, 15 de Março de 2019 às 20:58:39 UTC, Vlad escreveu:
>
> I am missing something very simple here, but can't unstuck myself:
>
> This is what I want to have in the Field constructor (though it's
> obviously incorrect):
>
> Field('link', default=lambda link, row: URL('podcast', 'episode/' + row.id,
> scheme=True, host=True))
>
> I simply want one field to be determined by the other, in this case the
> constructed link field should depend on the id field.
>
> How do I accomplish this correctly?
>
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