> Subject: Re: [rules-users] Need help related to collection of data
> accessingin rule file.
>
>
> I'm still not sure why this is a "bad idea"
> I've flattened out my fact class. Now instead of a collection A has a B
>
> In my decision table, I declare the variable
> $a : Region
>
> and one of the conditions is
> $
a.widget.id
>
> (assuming that Region class has a Widget class)
>
> I get the following error on invoking rules
> xstream.mapper.CannotResolveClassException: widget : widget
>
> It's hard for me to image a "flattened" pojo for rules to understand.
> In
> real world, a "Person" has an "Address" and Address has a "State" and
> it
> goes on. Ideally I would like to give the root object to a rule engine
> and
> write the conditions by drilling down the root object.
>
> Unless I'm doing something wrong here, is this possible in drools?
>
>
> Ross H wrote:
> >
> > 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@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@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@lists.jboss.org [mailto:
> >>>
rules-users-bounces@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@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@yahoo.com>
> >>> > To:
rules-users@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@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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> >>>
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> >>>
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> >>>
> >>>
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> >>>
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> >
> > _______________________________________________
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> >
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> >
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> >
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> --
> View this message in context:
http://n3.nabble.com/Re-Need-help-
> related-to-collection-of-data-accessing-in-rule-file-tp60311p68353.html
> Sent from the Drools - User mailing list archive at Nabble.com.
>
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>
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postmaster@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.
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