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

Fri Dec 4 05:24:12 EST 2009

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 at gmail.com> 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 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.
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>>
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