Assuming you want to deal with one PeopleMatch at a time:

when
  $match : PeopleMatch( $people: people )
  $match: Number( intValue < 0 )
                    from accumulate( $task : Task(handler memberOf $people), ...

I have some misgivings due to "intValue<0" and Matcher not being
assignment-compatible with java.lang.Number, but that's for you to
resolve.

-W


On 19/02/2013, Michiel Vermandel <mvermand@yahoo.com> wrote:
> Hi,
>
> I am kind of stuck in writing a rule :
>
>
> I have PeopleMatch facts in working memory.
> Each PeopleMatch has a number of persons:  PeopleMatch().getPeople =
> List<Person>
>
>
> I have planning-entities (Tasks) which have a planning-variable Person.
>
> Now I would like to create a rule to loop over the PeopleMatch objects,
> gather all Tasks for the people of this match and do some calculation with
> all tasks.
>
> This is what I have for the moment:
>
> rule "matchPeopleTasks"
>    when
>
>        $match : PeopleMatch()
>        $people :  List() from $match .people
>
>        $match: Number( intValue < 0 )
>                    from accumulate( $task : Task(handler == $people),
>                                    init( Matcher matcher =
> $match.getMatcher()),
>                                    action( matcher.addTask( $task ); ),
>                                    reverse( matcher.removeTask( $task ); ),
>                                    result( matcher.getMatch() ) );
>  then
>        ...
> end
>
>
> The problem area is of course the "accumulate( $task : ProjectTask(handler
> == $people),"
> How do I select all tasks in the accumulate function, based on a list of
> people?
>
> Thanks,
>
> Michiel
>
>
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