2009/3/20 Edson Tirelli <tirelli@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@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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