[rules-users] Weighted rules / scoring

[Chris Strachan]

Hi,

Don't think I intended to create a new instance, just modify the one 
matched in the rule.  The following seems to have got it working.

rule "Myscoreincreaserule"
    dialect "mvel"
    when
        a : Applicant( name == "chris" )
    then
        a.setScore( a.score + 2 );
end

Thanks for pointing me in the right direction.

Greg Barton wrote:
> 1) Where is the variable "score" initialized? If it's not a global the rule wouldn't compile.
>
> 2) Is your intent to create a new Applicant instance, or modify the one matched in the rule?  (Or maybe you want to gather the score from the matched instance and put it (+2) into a new instance?
>
> --- On Sun, 6/7/09, Chris Strachan <chris.strac at googlemail.com> wrote:
>
>   
>> From: Chris Strachan <chris.strac at googlemail.com>
>> Subject: [rules-users] Weighted rules / scoring
>> To: rules-users at lists.jboss.org
>> Date: Sunday, June 7, 2009, 1:11 PM
>> Hi,
>>
>>
>>
>> I want to be able to use drools / guvnor brms to store
>> weighted rules
>>
>> (scoring), however I can't seem to find a way to do
>> this.
>>
>>
>>
>> I attempted the following,
>>
>>
>>
>> rule "Myscoreincreaserule"
>>
>>         dialect "mvel"
>>
>>         when
>>
>>                 Applicant( name ==
>> "chris" )
>>
>>         then
>>
>>                 Applicant fact0 = new Applicant();
>>
>>                 fact0.setScore( score + 2 );
>>
>>                 insert(fact0 );
>>
>> end
>>
>>
>>
>> drools didn't seem to like the way I did this.
>>  Perhaps this isn't
>>
>> permitted, in effect I am trying to do - score = score +
>> 2.
>>
>>
>>
>> Upon validation I get the following error.
>>
>>
>>
>>         [Myscoreincreaserule] Unable to build
>> expression for 'consequence': Failed
>>
>> to compile: 1 compilation error(s): - (1,3) unqualified
>> type in strict mode
>>
>> for: age ' Applicant fact0 = new Applicant();
>> fact0.setScore( score + 2 );
>>
>> insert(fact0 ); '
>>
>>
>>
>> Any ideas on how I should be approaching this?
>>
>>
>>
>> Thanks,
>>
>>
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>>
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>
>
>       
>
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