----- Original Message ----
From: Marcus Ilgner <marcus.ilgner@gmail.com>
To: Rules Users List <rules-users@lists.jboss.org>
Sent: Thursday, July 17, 2008 2:35:55 PM
Subject: Re: [rules-users] Using from

Hi Aziz,

On Thu, Jul 17, 2008 at 8:26 PM, Aziz Boxwala <boxwala@yahoo.com> wrote:
> I have the following class structure.
>
> Class GrandFather {
>  List<Father> fathers;
>  public List<Father> getFathers() {return fathers;}
> }
>
> Class Father {
>    int age;
>  List<Son> sons;
>  public int getAge() {return age;}
>  public List<Son> getSons() {return sons;}
> }
>
> Class Son {
>  int age;
>  public int getAge() {return age;}
> }
>
> I'd like to write a rule that finds all the Fathers who have age > 45 and
> have Sons where the son's age is greater than 5. But I can't figure out how
> to use "from" to iterate over father first and then over son.
>
> Any help will be greatly appreciated.
>
> Thanks,
> --Aziz

Something like this?

rule "FatherAndSon
when
  $father : Father(age > 45)
  $son : Son(age > 5) from $father.sons
then
// do something
end

Best regards
Marcus
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