Fwd: [rules-users] syntax question

[Edson Tirelli]

---------- Forwarded message ----------
From: Edson Tirelli <ed.tirelli at gmail.com>
Date: 26/03/2007 15:06
Subject: Re: [rules-users] syntax question
To: Rules Users List <rules-users at lists.jboss.org>


   Michael,

   You got it right again.
   Just adding to your answer, the best way usually is to reorder the
patterns as you did, having the collection as the last constraint, but it is
also possible to use a predicate, instead of eval(), if you need to bind the
collection earlier.
   Example:

Customer( $cars: cars )
Manufacturer( $m : name, ( $cars.contains( $m ) ) )


   []s
   Edson


2007/3/26, Anstis, Michael (M.) < manstis1 at ford.com>:
>
>  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 at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Bruce leroy
> *Sent:* 23 March 2007 18:20
> *To:* rules-users at 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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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3124-6000
  Mobile: +55 11 9218-4151
  JBoss, a division of Red Hat @ www.jboss.com

-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3124-6000
  Mobile: +55 11 9218-4151
  JBoss, a division of Red Hat @ www.jboss.com
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