It's also possible to create "relation" objects in addition to the data objects
and insert these. In this situation, it might be a quadruple of Manufaturer,
Brand, Model and Part. These facts can be used in a number of ways, e.g.,
for obtaining all Models of a Brand, all Parts of a Model, all Models where a
Part is used, etc.

-W


On 4 May 2012 16:42, James K <james_kosa@verizon.net> wrote:
Thank you laune and manstis for the excellent / relevant information!  I have
a follow on question based on my findings the last couple of days using the
information you have provided.  I am using Drools Flow, firing the following
rule in a Rules Task in my flow.  Initially, I am only inserting a populated
AutoManufacturer into the flow as my transport object. In the flow, I am
able to access the sub-objects / collections on the parent to control flow.
I prefer to keep it this way.

However, it does not appear the sub-objects on the parent object are
available for LHS evaluation in the rule. So, I am creating a memory entry
for the automanufacturer objects and then iterating collections on the
object  / sub-objects to insert them as facts.  This is working, however, is
there not a way to do some sort of introspect on collections on the parent
object instead of inserting all of the additional facts and joining them
back together? Is there a better way to be doing this?  Another perspective
to approach this?


Rule Code
--------------------------------------------------------------
package com.nabble.demo

import com.nabble.demo.model.Part;
import com.nabble.demo.model.Brand;
import com.nabble.demo.model.Model;
import com.nabble.demo.model.AutoManufacturer;

rule "Insert additional facts from AutoManufacturer Base Class"
ruleflow-group "determineVendors"
 when
 $autoMfg : AutoManufacturer()
 then

   for(Brand brand : $autoMfg.getBrandsCollection()){
       System.out.println ("Adding Brand Fact: " + brand.getBrandName());
       insert(brand);
       for (Model model : brand.getBrandModels())
         {
           System.out.println ("Adding Model as Fact: " +
model.getModelName());
           insert(model);
           for (Part part : model.getPartsList())
              {
                 System.out.println ("Adding Part as Fact: " +
part.getPartsName());
                 insert(part);
              }
         }
     }
 end

rule "Part Vendor = PV999999"
ruleflow-group "determineVendors"
   when
 $p: Part( partVendor == "PV999999" )
 $m: Model( partsList contains $p )
 $b: Brand( brandModels contains $m)
 $a : AutoManufacturer( brandsCollection contains $b )

   then
       System.out.println( "Manf: " +$a.getManufacturerName() + " , Brand
Name: " + $b.getBrandName() + " , Brand ID: " + $b.getBrandId() + " , Model
Name: " + $m.getModelName() + " ,  Part ID: " +  $p.getPartsId()+ " , Part
Name: " +  $p.getPartsName());
end

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