Authenticate from one Rails app to another
I have two Rails apps, one Rails 3.0.9 using Authlogic, and one a Rails 3.1 using Devise. I'd like to Authenticate from the 3.1 app to the 3.0.9 app. I could switch out Authlogic for Devise pretty easily in the 3.0.9 app if needs be.

Both of these apps are intranet apps that are only available through our VPN at a small company, so the authentication is mostly only to pass around a current user object rather than protect sensitive info from the public at large.

There is a two year old question that looks promising and suggests using ActiveResource... but the answer itself and the documentation really leaves me with a lot of questions:

http://stackoverflow.com/questions/1097778/how-to-authenticate-one-ruby-on-rails-app-to-another-using-restful-authenticatio

Any suggestions would be extremely welcome.
Authenticate from one Rails app to another
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I have two Rails apps, one Rails 3.0.9 using Authlogic, and one a Rails 3.1 using Devise. I'd like to Authenticate from the 3.1 app to the 3.0.9 app. I could switch out Authlogic for Devise pretty easily in the 3.0.9 app if needs be.

Both of these apps are intranet apps that are only available through our VPN at a small company, so the authentication is mostly only to pass around a current user object rather than protect sensitive info from the public at large.

There is a two year old question that looks promising and suggests using ActiveResource... but the answer itself and the documentation really leaves me with a lot of questions:

http://stackoverflow.com/questions/1097778/how-to-authenticate-one-ruby-on-rails-app-to-another-using-restful-authenticatio

Any suggestions would be extremely welcome.