[rules-users] For loop inside a modify block problem

[Swindells, Thomas]

You could try assigning $item to a local variable and then using that within the for loop?

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Martin A
Sent: 11 January 2012 10:02
To: Rules Users List
Subject: Re: [rules-users] For loop inside a modify block problem

hi Michael,

All of the fields are public, however they are properties of a super class of Item. I tried with getters, doesn't work either way.
Still getting: 'no such identifier : $item'. When I remove the for loop, it goes ok, so I think it messes up things.

Best regards,
Martin
2012/1/11 Michael Anstis <michael.anstis at gmail.com<mailto:michael.anstis at gmail.com>>
RHS is not DRL syntax but Java or MVEL depending on your dialect.

If "id" is not public you should use it's getter. The same goes for "quantity".


when
    $item : Item(param1 != 0, param2 == 0, !(this instanceof SpecialItem))
    $gsc : SomeBusinessLogic
then
    $gsc.doSomething($item.getId() );
    for (int i = 0; i < $item.getQuantity(); i++) {
        $gsc.doSomethingElse($item.getId() );
    }
    update($gsc);
end


2012/1/11 Martin A <wmlsub at gmail.com<mailto:wmlsub at gmail.com>>
Hi, Davide,

Here is how my rule looks like :

when
    $item : Item(param1 != 0, param2 == 0, !(this instanceof SpecialItem))
    $gsc : SomeBusinessLogic
then
    $gsc.doSomething($item.id<http://item.id/>);
    for (int i = 0; i < $item.quantity; i++) {
        $gsc.doSomethingElse($item.id<http://item.id/>);
    }
    update($gsc);
end

The above snippet throws an error @ i < $item.quantity, and says 'no such identifier $item'...
I can't figure out what might be causing this.

Thanks

On Tue, Jan 10, 2012 at 10:08 PM, Davide Sottara <dsotty at gmail.com<mailto:dsotty at gmail.com>> wrote:
Did you remember to bind $item to some expression in the LHS ? Maybe you just
called that "item" without the $ :)
Davide

(the original "modify" syntax is still wrong anyway)

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