[rules-users] forall over a collection

[howard goldberg]

Thanks to both of you for the quick response!

Howard

2009/3/20 Edson Tirelli <tirelli at post.com>

>
>    Wolfgang is right in its suggestion.
>
>    Just to explain what the problem is, in previous versions of drools,
> forall() could not be used with an embedded from. It is fixed in trunk.
>
>    []s
>    Edson
>
> 2009/3/20 Wolfgang Laun <wolfgang.laun at gmail.com>
>
> You don't need forall to solve your problem. The following rule prints all
>> patient names which don't have problem 4711; omitting the 'not' prints
>> those suffering from Colognitis.
>>
>> rule lookJoe
>>     when
>>         $patient: Patient()
>>         not ( Problem( code == "4711" ) from $patient.problemList )
>>     then
>>         System.out.println( $patient.getName() );
>> end
>>
>> 'not' implies quantification (or exhaustive search over the domain).
>> Without 'not' also searches all Problem entries of the current Patient
>> so it would fire again if the patient has a problem stored more than
>> once.
>>
>> -W
>>
>>
>>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss, a division of Red Hat @ www.jboss.com
>
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