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

[Wolfgang Laun]

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.

-W


>
> Thanks.
> -Simon
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