restful_authentication是Rails的一个认证插件，基于REST方式，适合RESTful的geek

安装:

ruby script/plugin install http://svn.techno-weenie.net/projects/plugins/restful_authentication/
ruby script/generate authenticated users sessions

可选择性的修改routes:

# routes.rb
ActionController::Routing::Routes.draw do |map|
  map.home '', :controller => 'home', :action => 'index'

  map.resources :users
  map.resource  :session
  map.signup '/signup', :controller => 'users', :action => 'new'
  map.login  '/login', :controller => 'session', :action => 'new'
  map.logout '/logout', :controller => 'session', :action => 'destroy'
end

一些helper方法:

<!-- home/index.rhtml -->
<h1>Welcome</h1>

<% if logged_in? %>
  <p><strong>You are logged in as <%=h current_user.login %></strong></p>
  <p><%= link_to 'Logout', logout_path %></p>
<% else %>
  <p><strong>You are currently not logged in.</strong></p>
  <p>
    <%= link_to 'Login', login_path %> or
    <%= link_to 'Sign Up', signup_path %>
  </p>
<% end %>