[rules-users] Matching items based on values in lists

[Wolfgang Laun]

Seems you are missing the keyword "when":

rule "example"
when
       RqTargerType(...

-W

On 10/08/2010, cortlander <cortlander at gmail.com> wrote:
>
> I am new to drools and have been struggling with this rule.
>
> $subject: RqTargetType contains a list of RqAttrib objects
> $resource: RqTargetType also contains its own list of RqAttrib objects
>
> $subject in a certain role has to be selected based on (attribType ==
> "subject", designator == "subject.role", attribValue == "patient")
> $subjectId is to be extracted from another attribute (attribType ==
> "subject", designator == "subject.id",	$subjectId: attribValue)
>
> We then need to select a resource that has an attribute to match this
> $subjectId (attribType == "resource", designator == "resource.patient",
> attribValue == $subjectId )
> 			
> Here is the rule I wrote:
>
> rule "Patient Access Rule"
> 		#conditions
> 		RqTargetType( $subjectAttribs : rqAttribs )
> 		RqAttrib (attribType == "subject", designator == "subject.role",
> 			attribValue == "patient") from $subjectAttribs	
> 		RqAttrib (attribType == "subject", designator == "subject.id",
> 			$subjectId: attribValue) from $subjectAttribs
> 		
> 		$resource: RqTargetType( )
> 		RqAttrib (attribType == "resource", designator == "resource.patient",
> 			attribValue == $subjectId ) from $resource.getRqAttribs()
> 		RqAttribute (attribType == "resource", designator == "resource.id",
> 			$resourceId: attribValue ) from $resource.getRqAttribs
> 	then
> 		#actions
> 		System.out.println( "resource: " + $resourceId );
> 		System.out.println( "subject: " + $subjectId );
> 		System.out.println( "Patient Access rule decision: Permit" );
> 		decisions.add("Permit");
> 	retract($subject);				
> end
>
> I keep on getting "no viable alternative at input" error.
> Tried stripping the code so that only the following was left and still got
> the error:
> 		RqTargetType( $subjectAttribs : rqAttribs )
> 		RqAttrib (attribType == "subject", designator == "subject.role",
> 			attribValue == "patient") from $subjectAttribs	
> [ERR 101] Line 25:2 no viable alternative at input 'RqTargetType' in rule
> "Patient Access Rule"
>
> Then tried this with similar results.
> 		$subject: RqTargetType()
> 		$subjectAttrib: RqAttrib (attribType == "subject", designator ==
> "subject.role",
> 			attribValue == "patient") from $subject.getRqAttribs()
> no viable alternative at input '$subject' in rule "Patient Access Rule"
>
> Any help will be much appreciated.
> Thank you and have a great day.
> --
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> http://drools-java-rules-engine.46999.n3.nabble.com/Matching-items-based-on-values-in-lists-tp1075556p1075556.html
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