[rules-users] explanation on drl usage

[JLL]

Hi all,

i'm quiet new in drools (a french speaking so i appologise for my english
mistakes) and i'm surprise by the folowing problem
in drools example i found this code ...

Example 3.14. Return Value operator

Person( girlAge : age, sex == "F" )
Person( age == ( new Integer(girlAge.intValue() + 2) ), sex == 'M' )

This let me think that i can use method of an assigned variable in the
equality test

this my rule file

package be.labocollard.server.rules ;

import java.lang.Integer;
import java.lang.Double;

import be.labocollard.server.types.HumanSexType;
import be.labocollard.server.entities.Result;
import be.labocollard.server.entities.Resultat;
import be.labocollard.server.entities.Prestation;
import be.labocollard.server.entities.PrestationFacturable;
import be.labocollard.server.entities.Utilisateur;

rule "asserteResultatAndPrestation"
	when
		PrestationFacturable ( $resultat : resultat , $prestation : prestation) 
	then
		assert ( $resultat );
		assert ($prestation);
	end

rule "findRelevantResult"
	when 
		$resultat : Resultat()
		eval($resultat.getResults().size()>0)
	then
		assert($resultat.getResults().iterator().next());
	end		

rule "testPsaId"
	when
		$prestation : Prestation(id == "psaId")	
		$prestationFacturable : PrestationFacturable (prestation==$prestation,
$resultat : resultat)
		$result : Result (doubleValue < (new Double(12)))
		
		Resultat (id == $resultat.getId(), results contains $result )
>>> this sentence makes problem ...
>>> and i would like to avoid eval 
>>>		#eval ($resultat.getId()==id && 
$resultat.getResults().contains($result) )

		Utilisateur (age < (new Integer(55))) || Utilisateur (sex !=
HumanSexType.MALE)
	then
		retract($prestationFacturable);
	end	
		
Is there a drools guru to explain my misunderstanding ????

thanks a lot 

and thanks to drools developpers for those wonderfull tools

JLL
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