[rules-users] Upgrading from 3.x to 4.0.7
Hi -
I'm upgrading a large base of rules from 3.x to 4.0.7. However there
seem to be a few semantic differences. I have rules like the below in a
few places:
rule "All items should have a unique external id"
when
new_item : Item( exId : externalId )
old_item : Item( externalId == exId )
then
LOG.warn( "DUPE Detected: new:" + new_item + " old:" +
old_item );
retract( new_item );
end
And this all worked fine because 3.x would never assign the same object
to both new_item and old_item. I know my new/old seem arbitary - but I'm
just getting down to the minimal reproducing case. 4.x now will assign
one instance of an object to both new_item and old_item. Is there any
way to disable this behaviour?
thanks,
-Tom