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

[Joe Ammann]

Sorry, the actual error in my logic was totally unrelated to the
fragment below.

The problem was that the DQAttribute that should have matched below was
inserted by another rule, but the insertion was done at a time when the
checkViolations collection was still emtpy. And I had forgotten the
modify() after filling the checkViolations collection.

So the rule "saw" an empty collection and that last condition did not
trigger. Once I corrected that, things started working :-)

On 08/03/2013 10:59 PM, Joe Ammann wrote:
> 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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