[rules-users] Collect from

[Edson Tirelli]

   Remember that "collect" is a simplified form of "accumulate". So when you
can't achieve what you want with collect, first thing you should look for is
accumulate.

$list : List() from accumulate(
        $foo : Foo( ) and not Bar( id == $foo.id ),
        collectList( $foo ) )

   Please note that I changed your example making the constraint in Bar use
"==" instead of "!=" because I think that is what you want. But if it is
not, just use whatever expression you want.

   Also be aware that collect/accumulate are heavy CEs. Nesting multiple
patterns inside accumulate is even heavier, so use it wisely.

   Hope it helps,
       Edson


2009/8/18 techy <techluver007 at gmail.com>

>
> Please someone help me on this.
>
> techy wrote:
> >
> > I would like to collect All Foo() for which there is no Bar() as given
> > below.Please help me on this.
> > Thanks.
> >
> > //psedo rule
> > rule 'test'
> > list : from collect( Foo(fooId: id) and not Bar(id !=fooId))
> > then
> > //do conseq
> > end
> >
>
> --
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>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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