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

[Ross H]

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 at nds.com>

>  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 at lists.jboss.org [mailto:
> rules-users-bounces at 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 at gmail.com> 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 at yahoo.com>
> > To: rules-users at 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 at 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-in-rule-file-tp60311p67858.html
> Sent from the Drools - User mailing list archive at Nabble.com.
>
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