either with onvalidate or with a computed field .... read it on the book ^_^
http://web2py.com/books/default/chapter/29/06#Computed-fields

On Monday, April 15, 2013 8:34:48 PM UTC+2, Michael Herman wrote:
>
> I'm slightly confused on how to make a calculation and then update a SQL 
> field after a form is validated.
>
> What I'm trying to do is this: 
> http://www.screencast.com/users/Mike_Extentech/folders/Jing/media/70a2511b-f978-458b-8d4c-9a635b191a33
>
> Essentially, the end_date field is dependent on the data inputed into the 
> other two fields, start_date and length. So once the form is validated, a 
> calculation is triggered then the data is inserted into the database for 
> the end_date field.
>
> Does that make sense? 
>
> I'm also using the SQLFORM.grid default view for adding records.
>
>
> Thanks!
>
>

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