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

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. If you > have received this message in error, please immediately notify the > postmaster(a)nds.com and delete it from your system as well as any copies. > The content of e-mails as well as traffic data may be monitored by NDS for > employment and security purposes. To protect the environment please do not > print this e-mail unless necessary. > > NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 > 4EX, United Kingdom. A company registered in England and Wales. Registered > no. 3080780. VAT no. GB 603 8808 40-00 > > ************************************************************************************** > > ------------------------------ > This message is confidential and intended only for the addressee. If you > have received this message in error, please immediately notify the > postmaster(a)nds.com and delete it from your system as well as any copies. > The content of e-mails as well as traffic data may be monitored by NDS for > employment and security purposes. > To protect the environment please do not print this e-mail unless > necessary. > > An NDS Group Limited company. www.nds.com > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > >