You are right. I misunderstood the issue.

On Oct 23, 11:21 am, Anthony <abasta...@gmail.com> wrote:
> On Sunday, October 23, 2011 11:49:31 AM UTC-4, Massimo Di Pierro wrote:
>
> > lines[cash_price]=lines(cash_price) or 0  
>
> I don't think that will solve the problem. That will add a new
> 'SUM(orderline.cash_price)' key to lines rather than updating
> lines._extra['SUM(orderline.cash_price)']. However, when you subsequently do
> lines[cash_price], it will pull the old value from
> lines._extra['SUM(orderline.cash_price)'] and ignore the new value stored in
> the new key. This is because Row.__getitem__ always gets the value stored in
> _extra when the key is in _extra 
> (http://code.google.com/p/web2py/source/browse/gluon/dal.py#3888). To enable
> the assignment, I guess you'd have to update Row.__setitem__ so it would
> update _extra when the key is in _extra (though not sure if there are any
> downsides to that).
>
> Anthony

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