Re: [rules-users] Need help related to collection of data accessingin rule file.

Just added this point to the wiki on usage patterns: http://www.jboss.org/community/wiki/UsagePatterns On Fri, Dec 4, 2009 at 8:09 PM, Ross H <rossh00(a)gmail.com&gt; wrote: > Thanks Thomas, you've added a very important category to my thoughts: > what > does and what doesn't work easily in drools. I think this is the most > important category. Every framework has a degree of flexibility and > whilst > drools is extremely flexible, the consequences may not be that pleasant. > > 2009/12/4 Swindells, Thomas <TSwindells(a)nds.com&gt; > > I’d agree, and to join up with the other thread is the exact reason why >> we need some decent ‘design pattern’ documentation to explain what does >> and >> doesn’t easily work in drools. >> >> Depending what you are trying to do you may be able to use eval to >> perform >> the logic for you, though this will probably involve you writing the >> logic >> manually in java. See the thread Re: [rules-users] Can we use 'from' CE >> in >> Decision Tables ? for details. >> >> >> >> Thomas >> >> >> >> >> >> *From:* rules-users-bounces(a)lists.jboss.org [mailto: >> rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Ross H >> *Sent:* 04 December 2009 08:18 >> *To:* Rules Users List >> *Subject:* Re: [rules-users] Need help related to collection of data >> accessingin rule file. >> >> >> >> In my limited experience, I'm not sure you can do this in decision >> tables, >> but given the flexibility of Drools there may be a way, but I'm not sure >> this is a good thing. >> >> >> >> I suspect the rules you create will be really ugly and not support your >> longer term goals of flexibility. It might be better to transform your >> data >> into a better fact model that gives you the ability to create real >> business >> rules that are understandable. >> >> >> >> It appears that it is better to create a fact model that is more shallow >> and uses almost relational concepts to relate the facts together rather >> than >> a deeply nested model (I suspect you are getting this from some really >> ugly >> xml structure). So whilst it's a pain, I would reconsider your core >> domain/fact model. >> >> On Fri, Dec 4, 2009 at 4:08 PM, Pritam <infinity2heaven(a)gmail.com&gt; >> wrote: >> >> >> I have the same problem as I'm trying to create a decision table via >> excel >> where the fact is a root object A where A has a collection B, and B has >> a >> collection C. My rules are based out of the instance A, loop for each >> object >> in B, and within that, loop each object in C. Not sure how I can write >> an >> expression for the same. >> >> >From the examples, I see that one can access a particular element in A >> by >> $a.listname[1] but in my case, I need to access all elements in the >> loop. >> >> Any suggestions? >> >> >> prasad raju sagi wrote: >> > >> > Hi , >> > >> > I am trying to create rule on a fact , which contains arraylist of >> > collection and the object in the collection internally contains an >> > arraylist of another collection of objects. >> > >> > This looks like object A contains collection of objects B and B >> contains >> > collection object C >> > >> > A -> blist ( Arraylist ) >> > >> > B -> clist (ArrayList<C> ) >> > >> > C-> dlist( ArrayList<D>) >> > >> > D-> type ( string) >> > >> > I am inseting A as fact to the working memory. >> > >> > I am in confusion state like how to write the rule to place conditions >> on >> > collection C. >> > >> > Can I use from in the form of nested from in rule statment. >> > Thanks >> > Prasad Raju Sagi >> > Mobile: 847-644-4103 >> > >> > >> > >> > >> > ________________________________ >> > From: Aziz Boxwala <boxwala(a)yahoo.com&gt; >> > To: rules-users(a)lists.jboss.org >> > Sent: Thursday, June 11, 2009 1:58:28 PM >> > Subject: [rules-users] process order example not working fully >> > >> > >> > I am trying to execute a ruleflow and use rules to assign tasks within >> the >> > ruleflow in Drools 5.0.1. I have a drl file included in my knowledge >> base >> > that tries to assign a task to a user when a new human task is >> created. >> > This is based on the example in org.drools.example.process.order. I >> can't >> > get my code to work. I don't the rules in the example are working >> either >> > (dslr for the task assignment or the drl for dynamic logging). After >> some >> > attempts, I found that this condition >> > WorkItemNodeInstance() >> > does not evaluate to true ever. >> > >> > Do I have to do anything special to make the WorkItemNodeInstance >> appear >> > in working memory? >> > >> > Thanks for any help. >> > >> > --Aziz >> > >> > >> > >> > _______________________________________________ >> > rules-users mailing list >> > rules-users(a)lists.jboss.org >> > https://lists.jboss.org/mailman/listinfo/rules-users >> > >> > >> >> -- >> View this message in context: >> http://n3.nabble.com/Re-Need-help-related-to-collection-of-data-accessing... >> Sent from the Drools - User mailing list archive at Nabble.com. >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> ------------------------------ >> >> >> ************************************************************************************** >> This message is confidential and intended only for the addressee. 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