[jboss-jira] [JBoss JIRA] Updated: (JBRULES-1511) Can only reason over sub-objects if you use the From Conditional Element

[Mark Proctor (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-1511?page=all ]

Mark Proctor updated JBRULES-1511:
----------------------------------

    Assignee: Edson Tirelli  (was: Mark Proctor)

> Can only reason over sub-objects if you use the From Conditional Element
> ------------------------------------------------------------------------
>
>                 Key: JBRULES-1511
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1511
>             Project: JBoss Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Reteoo
>    Affects Versions: 4.0.4, 4.0.5
>            Reporter: Aaron Dixon
>         Assigned To: Edson Tirelli
>         Attachments: drools-issue.zip
>
>
> It appears that you MUST use the From Condition Element to reason over sub-objects or else Drools yields unpredictable behavior.
> The first two rules below appear to be semantically equivalent. However the "bad" rule (the rule that does not use the from conditional element) does not get activated correctly when there is another rule (see the third rule) that modifies the age sub-property before the first two rules are activated:
> rule "Older than 20 - Good"
> salience -100
> when
> 	person : Person( )
> 	Details( age > 20 ) from person.details
> then
> 	System.out.println( "Older than 20 (good) : " + person );
> end
> rule "Older than 20 - Bad"
> salience -100
> when
> 	person : Person( details.age > 20 )
> then
> 	System.out.println( "Older than 20 (bad) : " + person );
> end
> rule "30 is the new 20"
> when
> 	person : Person( details.age == 30 )
> then
> 	person.getDetails().setAge( 20 );
> 	System.out.println( "Now 20 : " + person );
> 	update( person );
> end
> Given that the "bad" rule is semantically equivalent to the second rule, Drools should treat both rules the same in the engine. See the referenced forum thread for further justification for this claim.
> Also, see the attached zip for an executable example.

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