[rules-users] Logic in the when clause

[Wolfgang Laun]

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 at 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 at lists.jboss.org [mailto:
> rules-users-bounces at 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 at 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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