AR model using a table form another database

Is there a way to configure an ActiveRecord model to use table in another database?

I ask this becouse our user table is a centralized one, used by many other applications. These applications use various ways/abstratctions to authenticate against this authentication data-source. The simples way I can think to do this with this Rails app would be to set the User model to use this table.

Any way to do this? Maybe a little hack in AR through a plugin?

Thanks in advance.

In database.yml file. just like development, production and test
database info add another one called user_db and add information for
Then in your user model do something like:
class User < ActiveRecord::Base
  establish_connection :user_db

Hope this should work fine.