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

[Wolfgang Laun]

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 at 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
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Accessing-properties-of-an-object-within-a-Nested-Collection-of-a-Nested-Collection-tp3955591p3962570.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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