[rules-users] memberOf mvel list

[Swindells, Thomas]

Am I being blind or are "in" and "not in" not actually documented in the drools expert user guide? In particular the fact that the syntax for the list is to put it in round brackets (1,2,3) and not the square brackets [1,2,3] which you would expect from the mvel documentation.

Also why can't memberOf work off an inline mvel list anyway?

Thomas

> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of Ansgar Konermann
> Sent: 21 February 2010 22:37
> To: Rules Users List
> Subject: Re: [rules-users] memberOf mvel list
>
> Hi Adam,
>
> try operator "in" instead of "memberOf". AFAIK, "in" deals with list
> literals (which is what you want) whereas "memberof" can be used to
> check whether some value is part of a collection given as variable
> reference.
>
> Kind regards
>
> Ansgar
>
> Am 21.02.2010 23:14, schrieb deaddowney:
> > I'm using a map because this is a legacy class that is quite dynamic and can
> > contain arbitrary tag/values.  Ideally, if I knew all the attributes I would
> > declare them as fields, but I'm stuck with this map at the moment.
> > Regardless, using your explanation, why does
> >
> > when
> >                                 $person : Person(
> >                                     props[“AGE”]>  20,
> >                                     (props[“NAME”] =="Fred" || props["NAME"]
> > == "Barney || props["NAME"] == "Wilma"])
> > )
> >
> > work?
> >
> >
> > Corneil du Plessis-2 wrote:
> >
> >> You are expecting map values to be elevated somehow from Object to Integer
> >> and String.
> >> By using typed attributes in the Person class you can overcome your
> >> problem.
> >>
> >> Sent from my HTC (Android)
> >>
> >> On Feb 21, 2010 9:28 PM, "Adam Krieg"<spamcontrol at mac.com>  wrote:
> >>
> >> I’m new to Drools and having trouble accessing my Domain object which is
> >> basically a container around a map.
> >>
> >> class Person {
> >>     Map props;
> >>     public Map getProps();
> >> …. Extra stuff
> >> }
> >>
> >>
> >> I want to create a rule that will match when Age is greater than 20 and
> >> name
> >> is one of “Fred”, “Barney”, or “Wilma”.  These  entries are stored in the
> >> Map props, so that to get age, you would call person.getProps().get(“AGE”)
> >>
> >>
> >>
> >> rule "My Rule"
> >>                 dialect "mvel"
> >>                 when
> >>                                 $person : Person(
> >>                                     props[“AGE”]>  20,
> >>                                     props[“NAME”] memberOf [“Fred”,
> >> “Wilma”,
> >> “Barney”]
> >>                                 )
> >>                 then
> >>                                 System.out.println("found match”+$person);
> >>
> >> End
> >>
> >> But I am running into a parsing error:
> >> no viable alternative at input ')' in rule "My Rule" in pattern Person.
> >>
> >> The second condition seems to be the problem.  Can I check for membership
> >> inside a List I create inline in mvel?
> >>
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >>
> >>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users


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