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

[Mark Proctor]

On 02/06/2011 08:14, Wolfgang Laun wrote:
> On 1 June 2011 21:43, Simon Chen <simonchennj at gmail.com 
> <mailto: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
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>
>
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