Felipe,

   I think you were very close to doing it right. What about this:

rule "remove used vacation days"
no-loop
when
vr: VacationRequestVO($days: availableDays , $iniDate: initDate )
$u: UserVO( $vacReqList: vacationRequestList )
Number ($usedDays : intValue > 1) from accumulate ( VacationRequestVO( isAproved == true, endDate < $iniDate, $uDays: usedDays)
from $vacReqList, sum($uDays))
then
vr.setAvailableDays($days - $usedDays);
end

    So, basically, what we are trying to do from a language perspective is to allow users to optionally provide a source for each pattern. So, if you simply write a pattern without a source, it comes from the working memory:

MyClass( ... )

   If you want him to come from another source, you use the "from" CE.  As you did, it is possible to nest the "from CE" inside the "accumulate CE".

Number(...) from accumulate( VacationRequestVO(...) from $vacRequeList ... )

   The other change you needed in your rule is that as you are adding up quantities, you want to use the "sum" function instead of "count" function that is used to count occurrences.

   Try out and let us know... this is a nice rule to show language expressiveness.

   []s
   Edson

2007/8/2, Felipe Piccolini <felipe.piccolini@bluesoft.cl>:
Hi,

   this is just a dumb question for drools-languaje gurus... like Edson :)

How ca I write a rule (CE in LHS) for accumulate atributes inside an object, but this objects are not facts,
they are inside a collection which is an attribute from a fact... pretty messy right?...lol..

well, the business problem is this.

I need to count (accumulate) vacation days used on previous vacation requests.
I have an User (which is one fact) having a collection of oldVacationRequests
and an actual VacationRequest (the another fact).
So the rules is like this: discount to the available days for vacation those used in previous
vacation request, and those days are the days between initDate and endDate in each
old vacation request with isAproved seted true and having endDate before the actual
vacation request initDate.

did I explain myself?... 



so I need to know if this is possible I was trying to do something like this...but is obviously wrong...:)
rule "remove used vacation days"
no-loop
when
vr: VacationRequestVO($days: availableDays , $iniDate: initDate )
$u: UserVO( $vacReqList: vacationRequestList )
$usedDays : Number (intValue > 1) from accumulate ( $ovr: VacationRequestVO( isAproved == true, endDate < $iniDate, $uDays: usedDays),
from $vacReqList, count($uDays))
then
vr.setAvailableDays($days - $usedDays);
end

Thanks... 
                                                                        
Felipe Piccolini M.


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  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
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