inherit classes

Hello guys,

 

i have problem with inherit from classes

i would like inherit from a class a good examples is:
Webinar 10/17/2012 - Direct Database Connectivity Using RhoConnect

  1. i create a class sql and  with query function
    class Sql < Rhoconnect::Model::Base
  2. i create a class tools with sql statements
    class Tools < Rhoconnect::Model::Base::Sql

In the contrast to the example, RhoConnection has a additonal file structure models->ruby->classes

but what is wrong?