Hi Bruce,

 

From my experience (with 3.1-M1) you can reference bound Facts/Columns in subsequent patterns; like:-

 

$m : Manufacturer ( name == "Honda" )

$c : Car ( manufacturer == $m )

$c : Customer ( cars contains $c, age > 18 )

 

$cars.contains("Honda") requires an eval statement as your requirement is equivalent to "Customer ( cars.contains("Honda") )" which does not use a zero-parameter field accessor and is not compliant with the Java Beans specification).

 

With kind regards,

 

Mike

 

---

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Bruce leroy
Sent: 23 March 2007 18:20
To: rules-users@lists.jboss.org
Subject: [rules-users] syntax question

Hi,

I have a question regarding rules syntax particularly with left hand side. Suppose I have the following condition ..

when
   Customer ( $cars : cars, age > 18 )
...

How can I use the bind variable "$cars" in subsequent statements without using eval(), like so ...

when
  Customer ( $cars : cars,  age > 18 )
  eval( $cars.contains( "Honda" ) )
....


Basically I would like to know what the alternatives for doing something like so this without having to use eval function. I know this might not be the best example for this question, but please I'm just learning this system right now.


Thanks in advance,
Bruce.
  

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