[rules-users] Testing for non-existance of an object in list

[Joe Ammann]

Hi all

I'm still struggling with the handling of lists and membership in the
LHS of rule. I'm trying to formulate a rule that only fires if a certain
object is not yet a member of a list.

Here's what I currently have (Drools 5.5.0 btw):

    rule "R2030: UpdateDQAttribute"
    dialect "mvel"
    agenda-group "PROCESS_CHECKRESULTS"
    when
        pv : PriceViolation ( p : changedPrice.price, dqc : check )
        ps : PriceSeries ( id == p.seriesId )
        i : Instrument ( id == ps.instrument.id )
        dqa : DQAttribute ( rootId == i.id, objectId == p.id )
        not dqcv : DQCheckViolation ( check.id == dqc.id ) from
    dqa.checkViolations
    then
        # debug
        for (DQCheckViolation dqcv : dqa.checkViolations) {
            logger.debug("dqc: {}, dqcv: {}", dqc.id, dqcv.check.id);
       
        }
    end

The rule fires and the log statement produces

    PriceCheck: dqc: 6fc6636b-9b7c-4302-bce7-1680eec57830, dqcv:
    6fc6636b-9b7c-4302-bce7-1680eec57830

The ids are the same, so I would have expected that last LHS condition
to avoid that the rule fires.

-- 
CU, Joe

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