[rules-users] list operations in "then" part

[Wolfgang Laun]

I cannot reproduce this error.

Do NOT rely on the automatic substitution of getters for simple field
accesses on a rule's right hand side, at least not for 5.2.0 CR.

Moreover, I cannot compile the constraint
   "jones" memberOf authors
This should be written as
   authors contains "jones".

For further analysis full workable code reproducing the issue would be
required.

-W


On 3 June 2011 22:47, Simon Chen <simonchennj at gmail.com> wrote:

> Can I maybe do a for loop in the "then" part? Is there a documentation
> regarding what is possible/impossible in the "then" part?
>
> Thanks.
> -Simon
>
> On Fri, Jun 3, 2011 at 3:23 PM, Simon Chen <simonchennj at gmail.com> wrote:
> > No, this doesn't work...
> >
> > Drools-5.2 doesn't help either :-(
> >
> > 2011/6/2 Joe White <Joe.White at recondotech.com>:
> >> If you cast $b on the RHS it will probably work. We’ve had to do this in
> the
> >> past for rules like this.
> >>
> >>
> >>
> >> ….
> >>
> >> then:
> >>  Test fact = new Test();
> >>
> >> Book rhsBook = (Book)$b;
> >>  fact.getList().addAll( rhsBook.authors );
> >>  insert(fact);
> >> end
> >>
> >>
> >>
> >>
> >>
> >> From: rules-users-bounces at lists.jboss.org
> >> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Mark Proctor
> >> Sent: Thursday, June 02, 2011 8:52 AM
> >> To: rules-users at lists.jboss.org
> >> Subject: Re: [rules-users] list operations in "then" part
> >>
> >>
> >>
> >> On 02/06/2011 08:14, Wolfgang Laun wrote:
> >>
> >> On 1 June 2011 21:43, Simon Chen <simonchennj at gmail.com> wrote:
> >>
> >> Hi all,
> >>
> >> I am always confused about what we can do in the "then" part of the
> rule.
> >>
> >> In particular, I have problem duplicate a list. For example:
> >>
> >> when:
> >>  $b: Book( "james" memberOf authors )
> >> then:
> >>  Test fact = new Test();
> >>  fact.getList().addAll( $b.authors );
> >>  insert(fact);
> >> end
> >>
> >> The error message reads like this:
> >>
> >> BuildError: Unable to build expression for 'consequence': [Error:
> >> Failed to compile: 2 compilation error(s):
> >>  - (1,7) unqualified type in strict mode for: $b
> >>  - (1,12) unqualified type in strict mode for: authors]
> >>
> >> What is the right way to do this?
> >>
> >> Granted - the error message is a puzzle in itself, but basically, the
> RHS
> >> must be written according to Java rules. Hence, if $b is an object of
> type
> >> Book, $b.authors depends on the (Java!) visibility of member authors. If
> it
> >> isn't public, you must use the getter.
> >>
> >> I believe he's using "mvel" judging by the error.
> >>
> >> mark
> >>
> >>
> >> -W
> >>
> >>
> >> Thanks.
> >> -Simon
> >> _______________________________________________
> >> 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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