[jboss-jira] [JBoss JIRA] Commented: (JBRULES-577) Please add "contained by" syntax for constraints

Please add "contained by" syntax for constraints ------------------------------------------------ Key: JBRULES-577 URL: http://jira.jboss.com/jira/browse/JBRULES-577 Project: JBoss Rules Issue Type: Feature Request Security Level: Public(Everyone can see) Components: Drl Parser/Builder Reporter: Dirk Bergstrom Assigned To: Edson Tirelli I'd like to be able to write a constraint to determine if a field's value is a member of some collection. This is the inverse of the "contains" keyword. The proposed syntax is: [bindingVar :] <fieldName> in <someCollection> (I'm not picky about the keyword, other possibilities are "containedBy" or "memberOf", but "in" is a single word) Use case: I have a container class with a field that exposes a collection of record numbers. In the working memory, I have a bunch of record objects, and one container object. I want to write a rule that fires when it encounters a container that has records matching some criteria: when Container( $recordNums : records ) Record( number in $recordNums, otherField == "somevalue" ) then doStuff(); The current workaround is: Record( num : number -> ( $recordNums.contains(num) ) ) Which is problematic, as the predicate may not be time-constant.