Thanks very much

________________________________

From: [email protected]
[mailto:[email protected]] On Behalf Of Wolfgang Laun
Sent: 20 March 2009 10:45
To: Rules Users List
Subject: Re: [rules-users] Logic in the when clause


Well, accesses to embedded objects are a little more complicated, but if
you want it:

rule HomeWinEt
    when
        $f : Fact( $d : details )
             eval( $d.CLOCK_STAGE > 10 &&
                   ($d.HOME_MATCH_SCORE - $d.HOME_FULL_TIME_SCORE >
                    $d.AWAY_MATCH_SCORE - $d.AWAY_FULL_TIME_SCORE))
    then
    # ...
end

Consider asserting the objects stored as the Facts.details as well. This
will let you write the much more declarative (and presumably more
efficient) rule with the "return value" restriction:

rule HomeWinEtxxx
    when
        $d : Detail( CLOCK_STAGE > 10,
                     HOME_MATCH_SCORE > (HOME_FULL_TIME_SCORE +
AWAY_MATCH_SCORE - AWAY_FULL_TIME_SCORE))
        $f : Fact( details == $d )
    then
       # ...
end

-W





2009/3/20 Zevenbergen, Alex <[email protected]>


        Thanks,
         
        this is the rule:
         
        rule "Home win et" 

        when

        $f : Fact(details.CLOCK_STAGE > 10,(details.HOME_MATCH_SCORE -
details.HOME_FULL_TIME_SCORE) > (details.AWAY_MATCH_SCORE -
details.AWAY_FULL_TIME_SCORE))

        then

        

        

        end

________________________________

        From: [email protected]
[mailto:[email protected]] On Behalf Of Wolfgang Laun
        Sent: 20 March 2009 09:15
        To: Rules Users List
        Subject: Re: [rules-users] Logic in the when clause
        
        
        You could use eval( <expression> ) for this, but I guess it
could also be added as a return value field constraint to the last of
these four fields. Would you mind providing the full pattern?
        -W
        
        
        2009/3/20 Zevenbergen, Alex <[email protected]>
        

                Hi,
                 
                quick newbie question about the when clause in a rule.
eg can i get the fact to be tested from the result of two other inputted
facts?
                 
                details.HOME_MATCH_SCORE - details.HOME_FULL_TIME_SCORE
> details.AWAY_MATCH_SCORE - details.AWAY_FULL_TIME_SCORE

                I assumed this would work fine but it doesn't recognise
the '-' as a minus!

                Thanks in advance

                Alex

                 

        
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