[rules-users] "collection contains" problem

[Edson Tirelli]

   The rule looks fine, so the problem is somewhere else:

* Are you properly implementing the equals()/hashcode() methods in the
StatusProperty class? or are you checking for the exact same instance (in
which case the defaul equals()/hashcode() would work)

* are you adding the properties to the TrainingStatus.properties collection
before inserting TrainingStatus into the session? or are you calling
update/modify after inserting it?

    Also, not related to the problem at all, but we recommend you to use
modify() instead of update() in your rules consequence:

modify( t ) {
    setNextSection( "section_b" ),
    setPreviousSection( "section_overview" )
}

   []s
   Edson


2010/1/24 Mike Dougherty <mjdougherty at gmail.com>

> Hello all,
>
> I've been getting more and more into using Drools Expert, but I certainly
> still have a lot to learn. I have almost a complete rules file ready to go.
> But I am having an issue with the LHS checking that a collection contains a
> certain object value. The rule currently looks like this:
>
> rule "Rule Name"
> no-loop true
>        when
>            property : StatusProperty( name == "propertyName", value ==
> "valueA" )
>            t : TrainingStatus( currentSection == "section_a", properties
> contains property )
>        then
>            t.setNextSection( "section_b" );
>            t.setPreviousSection( "section_overview" );
>            update( t );
> end
>
>
> The TrainingStatus object has the following fields:
>
> public class TrainingStatus implements Serializable {
>        private String currentSection;
>        private String nextSection;
>        private String previousSection;
>        private Set<StatusProperty> properties = new
> TreeSet<StatusProperty>();
> }
>
> And the StatusProperty object has the following:
>
> public class StatusProperty implements Serializable {
>        private String name;
>        private String value;
> }
>
>
> I'm inserting a TrainingStatus object that should match this rule. But the
> resulting object does not have the nextSection and previousSection fields
> set to the values they should.
>
> Can anyone advise on how to get this rule working as expected?
>
> Thanks for your help!
>
> Mike
>
>
> _______________________________________________
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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