Method of using multiple db connection in ActiveRecord

multiple_db_connections.rb

# The idea here is to specify that a given model should use another
# database without having to change the entire inheritance hierarchy

# declare model for table in primary connection
class Bar < ActiveRecord::Base
  # assume we have logic here that we don't want to refactor into a module
  # but we do want to inherit in OtherDb::Bar
end

module Foo

  # base model in Foo namespace - uses another db
  class BaseConnection < ActiveRecord::Base
    # OtherDb::Title.database contains a db config hash
    # This would probably go in the initializers
    establish_connection OtherDb::Title.database 
  end

  # module used to override db connection
  module OtherDb::Base
    def retrieve_connection
      # connection_handler.retrieve_connection(self) #  normal behavior
      connection_handler.retrieve_connection(Foo::BaseConnection) # use db from Foo::BaseConnection
    end
  end

  # Foo::Bar is identical to ::Bar but is in another db
  class Bar < ::Bar
    extend OtherDb::Base
  end
end