Multiple databases connection on Rails 3

database.yml

config/database.yml

development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000


db:
  adapter: sqlite3
  database: db/db.sqlite3
  pool: 5
  timeout: 5000

db.rb

app/models/db.rb

class Db < ActiveRecord::Base
  establish_connection :db
  self.abstract_class = true
end

post.rb

app/models/posts.rb
class Post < Db
  set_table_name :notes
end