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

[Joe White]

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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