scoped friendly_id w/ sti

scoped friendly_id w sti.rb

## The setup
# This assumes you already have friendly_id in your gemfile and all that good stuff.
class Car < ActiveRecord::Base
  # Slugs via FriendlyId
  extend FriendlyId
  friendly_id :name, :use => :scoped, :scope => :type
end

class Ford < Car
end

class Toyota < Car
end

## A simple test to make sure it works
t = Toyota.create!(name: "test")
f = Ford.create!(name: "test")
t.slug
 => "test"
f.slug
 => "test"