I think you want something like:
Field('duration', 'integer',*compute=lambda r:
(r['created_on']-r['check_in.created_on']*).days),
or
Field('duration', 'integer', *compute=lambda r:
(request.now-r['check_in.created_on']*).days),
They should both work but I am more confident about the latter.
On Thursday, 28 March 2013 11:22:02 UTC-5, 黄祥 wrote:
>
> i've already define it, and forgot to paste in this email :
> db._common_fields.append(auth.signature)
>
> i've already input via database administration to make the date and time
> for check_in.created_on is not on the same day with check_out.created_on
> but the result for duration field is always return 0:00:00.
>
> any idea why this happen?
> thank you so much in advance
>
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