[rules-users] problem with drules

[Edson Tirelli]

    I would say, this is one of those cases where it is best to use the
right tool for the right job. A programmer can implement this in pure DRL
using a few rules, but I don't like the idea, because it will be hard for
others to quickly grasp the meaning of the rules. So, I would implement a
function (either simple or an accumulate function) to calculate the number
of free items and use the rules for what they do best: act on the results.

    The rule would be like:

rule "add free items"
where
    Brand( $name : name, includedInPromotion == true )
    Number( $free : intValue > 0 ) from accumulate(
             $i : Item( brand == $name ),
             calculateFree( $i ) )
then
    // add $free items to the order
end

    Take a look at the docs on how to implement the function to calculate
the number of free items. It is very simple.
    This way, your business rule above is clear and easy to
understand/maintain.

    Hope it helps.

    []s
    Edson

2009/1/23 niraj manandhar <regniraj at gmail.com>

> I have following plan for the free item distribution
>
> purchase of 3 items under a same  brands will get 1 gift item free
> purchase of 5 items under a same  brands will get 2  gift item free
> purchase of 10 items under a same  brands will get 4  gift item free
>
>
> now if some buyer buys 13 items then he wil get free ites
> 4 for first 10
> 1 for the remaining 3
>
> tell me how to make a drl with this thing'
>
>
>
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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