[rules-users] Maps in Drools

[KDR]

Thanks again Edson. I'd just used a String object to try a simple test but of
course your example makes a lot more sense. And thanks also for clarifying
that there's full syntax support in the latest mvel jar version.

I know this is a Drools rather Java list but as I'm new to both, may I ask
further how to install that new jar version you mentioned into my current
Eclipse Drools project, or indeed how to get new Drools projects in Eclipse
to use it please, instead of the old version? I've tried copying the jar
into the Drools runtime folder but it doesn't work?

Cheers


Edson Tirelli-3 wrote:
> 
> "On the general issue, is it received wisdom that it's better not to
> insert
> map objects direct, at least for now until map support is fully there - or
> is it 6 of one / half a dozen?"
> 
>    Maps are data structures, not Domain entities. Using maps as domain
> entities is possible, but usually makes your rules unreadable. That is why
> it is bad to use any data structures or simple numbers, strings, dates as
> isolated facts... they don't have a well known business semantic in a
> given
> business model (not to mention how they get mixed with each other and
> cause
> cross products, etc). A rule like the following has no explicit meaning:
> 
>        when
>                $str: String()
>                $m: Map( this[$str] == 1 )
>        then
> 
>     But when you write something like:
> 
>         when
>                Customer( $custId : id )
>                DailyOrders( count[$custId] == 1 )
>         then
> 
>     Things are clear just by looking at them, even if $custId is a String
> and count is a Map as in the original example.
> 
>     Regarding the bug, it was a regression that was fixed. All the syntax
> support we intended to have for them is in Drools. Not sure what you mean
> by
> "support is fully there".
> 
>     Hope it helps.
> 
>     []s
>     Edson
> 
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