title: Two Rails applications, one userbase, looking for a simplest solution to handle this
body: <p>I have two Rails applications, let's call them A and B. A has existing user base and i want these users to be able to log in to B with the username and password managed in A.</p>
  
  <p>B is altered version of Altered Beast forum and it would be nice if users of my application do not have to create another user account to use forum. My initial thought was just to swap out the User model with ActiveResource model. Forum is hosted on a different server so direct database connection to A's database is too much trouble.</p>
  
  <p>My question is that is there any plugins or authentication system extensions that handle this kind of setup.</p>