good walk-through on authentication and authorization in rails?

Im new to rails and would like to implement author开发者_运维问答ization and authentication for my app, is there any good walk-through from the installation of the plug in to getting role based authorization implemented?

thanks

I would recomend you to check out the excellent railscasts site, where you can find many authentication/authorization implementation examples. I would choose between:

Authentication:

• Authlogic
• Devise

Authorization

• Cancan
• Declarative Authorisation

Try http://railscasts.com

specifically:

http://railscasts.com/episodes/192-authorization-with-cancan
or
http://railscasts.com/episodes/188-declarative-authorization

There are lots of plugins but the above are a good place to start (and railscasts is a great resource)