Although Drools makes extensive usage of MVEL, it is always embedded in the DRL language. So, it is Drools that defines that a field constraint is always a field accessor in the left with one or more restrictions in the right.
We need to find a way to make the Drools x MVEL relationship more clear because it is not the first time this slight confusion is made. Anyway, docs are being updated, but take a look at the Pattern documentation (item 7.8.2.1): https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/docs/drools-expert/html/ch07.html#RuleLanguage-ConditionalElements []s Edson 2009/3/17 Femke De Backere <[email protected]> > Thx! > > Do you know where I could find a tutorial of MVEL in Drools, because I > looked at some MVEL tutorials yesterday and I didn't find the solution... > > 2009/3/17 Edson Tirelli <[email protected]> > >> >> Left side of a constraint should always be a field name... no >> expression allowed. Either move the expression to the right side or use >> eval. >> >> Patient( sedation.ultiva > ( 0.1 - 0.02 ) ) >> >> Or even better: >> >> Patient(sedation.ultiva > 0.08) >> >> []s >> Edson >> >> 2009/3/16 Femke De Backere <[email protected]> >> >>> Hi, >>> >>> The following expression keeps returning the error [112,32]: [ERR 103] >>> Line 112:32 no viable alternative at input '+' in rule >>> "RuleFlow-Split-masterproef.ruleflows.shortsedation-18-22" in pattern >>> Patient: >>> Patient(sedation.ultiva+0.02 > 0.1) >>> with sedation.ultiva returning a double >>> What am I doing wrong? >>> Thx, >>> Femke >>> >>> _______________________________________________ >>> rules-users mailing list >>> [email protected] >>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >>> >> >> >> -- >> Edson Tirelli >> JBoss Drools Core Development >> JBoss, a division of Red Hat @ www.jboss.com >> >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com
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