Install and config rails plugin restful_authentication

Ruby on rails plugin Restful_authentication is a basic plugin useful for most of rails applications. It is very easy to intall and config it:

script/plugin source http://svn.techno-weenie.net/projects/plugins
script/plugin install restful_authentication
script/generate authenticated user sessions
rake db:migrate

Check the code in your routes.rb which is automatically added by the generation

map.resources :users
map.resource :session

Add more route mapping if your want

map.signup '/signup', :controller => 'users', :action => 'new'
map.login '/login', :controller => 'sessions', :action => 'new'
map.logout '/logout', :controller => 'sessions', :action => 'destroy'

Visit http://localhost:3000/users/new or http://localhost:3000/signup

Then to make it work with Comatose, add comatose config to evironment.rb of your app:

Comatose.configure do |config|
# Includes AuthenticationSystem in the ComatoseAdminController
config.admin_includes << :authenticated_system

# Calls :login_required as a before_filter
config.admin_authorization = :login_required
end