Re: [rules-users] [newbie] Using rules to enforce constraints?

Doh! rule 2 should of course read "A suspended customer may /not/ place any orders" Sorry. Scott Finnie wrote: > Hi, > > Apologies if this has been covered somewhere, couldn't find it in the > archives. > > I'm wondering about ability / sensibility of above. For example, say I > want to model the following rules: > > 1. A customer must be suspended if they default on a payment > 2. A suspended customer may place any orders > > Now the first one I can readily map to the when/then format of > production rules. But I can't see how to elegantly represent the second > one - at least not in a transactionally clean manner. I could write: > > when > c: Customer (status == "suspended") > o: Order ( customer == c) > then > o.reject() #etc. > > But that's not really what I want to achieve. Rather, I'd like the > check enforced before the order was created, not after. > > Or maybe I'm just thinking wrong? Main influence is RDBMS, where I'd > write a trigger that would stop the transaction completing if violated. > > Hope that makes sense, and thanks in advance. > > - Scoot. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users