[rules-dev] Trouble using constants to access Maps

[Edson Tirelli]

    There was a limitation on MVEL on using constants as keys. I know it was
fixed, but not sure about the version. Which specific version of MVEL are
you using? (1.3.xx)

    Edson

2010/1/30 @ndré <andre at bonkowski.net>

>
> Hi all!
>
> I'm writing a rule that contains the following statement:
>
>
> $agreementOffer:AgreementOffer($logicalFixedNumber:configurationParameters["6410"])
>
> This results of this is not surprisingly that both $agreementOffer and
> $logicalFixedNumber get assigned a value.
> Instead of using the "magic value" 6410, I want to use ParameterId constant
> class, which implements the toString() to return the value.
>
> I have tried several different ways to refer to the constant but without
> luck. The errors says:
>
> Unable to create Field Extractor for
> 'configurationParameters[ParameterId.LOGICAL_NUMBER_FIXED]
> I have also tried to extract the value of the
> ParameterId.LOGICAL_NUMBER_FIXED into a local variable, which I can see
> prints the correct value, but the error says the same:
>
> Unable to create Field Extractor for
> 'configurationParameters[$logicalNumberFixedConstant]
>
> Do anyone understand what is happening here and what I do wrong?
>
> I'm are still on the JKD 1.4, and uses MVEL 1.3
>
> Thanks,
>
> @ndré
> --
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>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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