Thanks very much

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] 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 <azevenbergen@paddypower.com>
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: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] 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 <azevenbergen@paddypower.com>
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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