Yes. I have read ALL the DAL section from the manual and I think you are 
right.
I just wonder if I could use the 'compute' or 'filter in' function as well.

I never heard of form 'on update'. Is it web2py feature?

Thanks! :)

On Wednesday, June 25, 2014 9:58:41 AM UTC+3, 黄祥 wrote:
>
> i think you can achieve it using before and after update callback (handle 
> in dal), another way is using onupdate (handle in form)
>
> best regards,
> stifan
>

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