[rules-users] bug in "accumulate"

[Edson Tirelli]

    Sorry, this message just came to my attention.

    A variable bound in the source pattern can only be used in the action()
and reverse() blocks. This makes sense because the init() and result()
blocks are executed only once for all matches, while the action() and
reverse() blocks are executed once FOR EACH match. So, in your example:

Number( ) from accumulate(
              Parent( $h : height ),
              init(),
              action(),
              reverse(),
              result())

Pretend you have more than one matching Parent, if it was allowed to use $h
in init() or result() blocks, what Parent height would $h correspond to?

   Not sure if it is clear, but maybe someone can help explaining that...

   []s
   Edson


2007/8/9, Manukyan, Sergey <SManukyan at lear.com>:
>
>  Actually there is a $h in the code… sorry for the omission in the email.
>
>
>
> Just checked it again today – it gives me same result as yesterday :
>
>
>
> rule …
>
>     when
>
>             o : Date from accumulate (
>
> Parent( $h : height  ) ,
>
> init(;),
>
> action(;),
>
> reverse(),
>
> result( $h )
>
> )
>
>             then …
>
> end
>
>
>
>
>
> -Sergey
>
>
>
>
>  ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Mark Proctor
> *Sent:* Wednesday, August 08, 2007 4:51 PM
> *To:* Rules Users List
> *Subject:* Re: [rules-users] bug in "accumulate"
>
>
>
> you didn't have a dollar on the field binding:
> Parent( h : height  )
>
> $ is optional, but you must use the same in all places.
>
> Mark
> Manukyan, Sergey wrote:
>
> Folks,
>
>
>
> Using 4.0. Think I found a bug in accumulate. The variables defined inside
> *<source pattern>* cannot be recognized inside of other parts of
> accumulate (action, result)
>
>
>
> f.e.
>
>
>
> rule …
>
>     when
>
>             o : Date from accumulate (
>
> Parent( h : height  ) ,
>
> init(;),
>
> action(;),
>
> reverse(),
>
> result( $h )
>
> )
>
>             then …
>
> end
>
>
>
>
>
> Produces : $h cannot be resolved
>
>
>
>
>
> Stack trace:
>
>
>
>
>
>       at org.drools.rule.Package.checkValidity(*Package.java:408*)
>
>       at org.drools.common.AbstractRuleBase.addPackage(*
> AbstractRuleBase.java:288*)
>
>       at com.lear.rules.RuleBaseFacade.getRuleBase(*RuleBaseFacade.java:46
> *)
>
>
>
>
>
>
>
> -Sergey
>
>
>
>
>
>
>
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-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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