Re: [rules-users] Accepted idiom for binding variable to restriction?

The "inline eval" constraint is what you want: a boolean expression, within parentheses. $response : Response( $question : question, eval(question.getID().equals( "XYZ" ) ) ) See the Drools Expert manual, section on "Left Hand Side..." -W On 1 June 2010 23:54, Laird Nelson <ljnelson(a)gmail.com&gt; wrote: > I have a fact that is inserted into my rule base. It is a Response. > > A Response has a Question that it is a response to. At the moment, > the Question itself is not separately inserted into the knowledge > base. I would ideally like to keep it this way. > > What's the best approach for binding variables to both the Response > and its associated Question? > > That is, if the Question were inserted, it would be relatively easy: > > when > $question : Question( ) > $response : Response( question == $question ) > > ...but I'm finding myself somewhat confused how to "extract" a > Question out of a Response, particularly when, say, I want to "select" > only Responses whose associated Question IDs are "XYZ": > > when > $response : Response( $question : question.ID == "XYZ" ) // boy > howdy does this seem wrong > > Is the easiest thing to do here to add a second rule that just inserts > the questions: > > when > $response : Response > then > insert($response.getQuestion()) > end > > ...? I would love to stay away from this if I could. > > Thanks, > Laird > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users