I think you misunderstand how rules work. All Facts inserted into working memory will be compared to all patterns in all rules; and where a match is found an activation recorded (i.e. LHS runs). So the following would group all products of type (if you insert DelieveryList's into WM and set the type for each list you only need the one rule):- rule"group by type" when $d : DelieveryList ( $t : productType ) $p : Product( type == $t ) then $d.add($p) end You don't need to "iterate" with rules; simply add all the objects to WM. Cheers, Mike _____ From: KinG CD [mailto:kingcd8@hotmail.com] Sent: 12 March 2008 19:07 To: Anstis, Michael (M.) Subject: RE: Can I use drools to solve my problem? Actually I was able to get near to that, but thank you very much, it cleared my mind. My problem still is to group things. So I have a list of products and I want to group them by type. So I want to create N lists for N types, each list with every product of a certain type. e.g Product -type -name -id ======= productList{product1, product2, product3,...,productN} I want a rule that rule"group by type" when iterate the List and generate a productListbyType grouping all products of typeN then deliveryList.add(productListbyType) remove each product from the main List(i dont think i really nedd that) end and loop in that rule until list is 'cleared'(all products have been sent to their right lists. sorry for bothering you, but i really searched for that and did not found. I could iterate the list with the from collect bu i dont know how to use an "abstract" type, how to iterate for all kind of types. we can have N types. thank you very much. _____ Subject: RE: Can I use drools to solve my problem? Date: Mon, 10 Mar 2008 10:21:45 +0000 From: manstis1(a)ford.com To: rules-users(a)lists.jboss.org CC: kingcd8(a)hotmail.com In my opinion it will be much easier if you insert individual Orders and Products Here's a hurriedly put together example to help you think in terms of rules (I have no experience of your problem domain so this might be laughably wrong):- Global ArrayList branch1; rule "Delievery split - Branch 1" when $p : Product( $b : branch = "Branch 1" ) $o : Order( products contains $p ) then OrderDelievery od = new OrderDelievery($o, $p, $b); insert(od); end rule "Consolidate delieveries" when $od : OrderDelievery( branch = "Branch 1" ) then branch1.add($od); end Or you could just retrieve the OrderDelievery objects from WM at the end. Drools can definately achieve what you want. If you can solve the problem with hard-coded rules you can solve it with Drools. Good luck, Mike _____ From: KinG CD [mailto:kingcd8@hotmail.com] Sent: 07 March 2008 17:08 To: Anstis, Michael (M.) Subject: RE: Can I use drools to solve my problem? alright. I was trying not to boder you. My companie is developing a billing software for a e-commerce site. So we have an Order and we have to transform it into deliveries. So each Order has many products and I have to filter it and define X deliveries(i call it 'delivery split'). There are filters like disponibility(in how many days it will be ok), brach(in what city is the product), type(if it is a kit, ticket...),... I tried many ways and i really think that drools isn't the best tool for my problem. The point is that mi boos dont want to use the hard code for define the deliveries. He wats drolls to do everything. So i tried inserting the the order in the WM, and using 'rom' chained with 'collect' i could iterate and set a list based in some rules, but how can i create lists based on the branch. how can i group in Y different lists the Z different products i have. I also inserted each product manually and tried to manipulate each one. But the point is that the rules should be interdependent but i was not able to do it. the resume is that i want to take the order and set N deliveries based on interdependent rules. i would like to do almost everything with drools not using the hard code. Sorry for the English, thanj you very much for the help, i'm a little lost. ect: FW: Can I use drools to solve my problem? _____ Encontre o que você procura com mais eficiência! Instale já a Barra de Ferramentas com Windows Desktop Search! É GRÁTIS! <http://www.windowslive.com.br/> _____ Encontre o que você procura com mais eficiência! Instale já a Barra de Ferramentas com Windows Desktop Search! É GRÁTIS! <http://www.windowslive.com.br>