First, note that you are not limited to using a lambda -- you can use any
function/callable. So, if you need to do an assignment, write a separate
function.
In this case, though, you can instead use the .update method:
db.solicitacao._before_update.append(lambda qset, f:
f.update(cadastro=request.now if f['status'] in ['Edição', 'Enviado']
else None))
Also, note that the first argument passed to the callback is the set
object, not the fields; and the fields object is a dictionary, so you have
to do f['status'] rather than f.status.
Anthony
On Thursday, June 12, 2014 2:54:03 PM UTC-4, Fabiano Almeida wrote:
>
> Hi,
>
> In a table I need to change the field value (name: cadastro, type:
> datetime) to request.now depending on the value assigned to another field
> (name: status) of the same record.
>
> I thought of using the _before_update callbcak for this purpose:
>
> db.solicitacao._before_update.append(lambda f: f.cadastro=request.now if
> (f.status == 'Edição') or (f.status =='Enviado') else None)
>
> Thus returns the message "*lambda cannot contain assignment*"
>
> Any suggestions?
>
> Thanks in advance,
>
> Fabiano.
>
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