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

[Mark Proctor]

On 02/06/2011 15:24, Simon Chen wrote:
> 2011/6/2 Wolfgang Laun<wolfgang.laun at gmail.com>:
>> 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 always have the variables "protected" and use public getters. For
> other variables, $b.xxx just works, as long as getXxx() exists. But
> for $b.authors, even if I have getAuthors() there, it still doesn't
> work. That's why I'm suspecting something wrong with the list - the
> only difference is that authors is an EList object...
>
Have you tried this with 5.2 CR1, lots of MVEL fixes.

Mark
> Still don't know why...
>
> -Simon
>
>> -W
>>
>>> Thanks.
>>> -Simon
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