Re: [rules-users] Accessing properties of an object within a Nested Collection of a Nested Collection
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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