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

[Simon Chen]

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
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>>
>>
>>
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>