## database.yml

development:
  adapter: mysql
  database: myrailsdatabase_development
  username: root
  password:
  socket: /tmp/mysql.sock

foos:
  adapter: mysql
  database: foos
  username: root
  password:
  socket: /tmp/mysql.sock

##/app/models/foo.rb

class Foo < ActiveRecord::Base
  establish_connection :foos
end