class StarWarsCharacters < ActiveRecord::Base
  named_scope :born_on_tatooine, :conditions => ["birthplace LIKE ?", "Tatooine"]
end

class Jedi < StarWarsCharacters
end

class Sith < StarWarsCharacters
end

> Sith.create :name => "Darth Vader", :birthplace => "Tatooine"
> reload!
> Jedi.born_on_tatooine
=> []
> Sith.born_on_tatooine
=> #<Sith id: 1, name: "Darth Vader", type: "Sith">]

Good!

> Jedi.born_on_tatooine
=> #<Sith id: 1, name: "Darth Vader", type: "Sith">]

?????