Ruby on Rails
ActionController

Actions grouped in controller

• Action as method instead of object, shared helper methods

Rendering

• Assigns
• Status codes

Redirection

• Url, Path, Action, Controller
• Attribute-based, save/create/update

Filters

 FrontpageController
   before_filter :cache
   after_filter  :compress

 WebserviceController
   before_filter :token_auth

 AdministrationController
   before_filter :ensure_login, :audit

 SecretController < AdministrationController
   prepend_before_filter :encrypt

• Processing chain, separation of concerns, shared stacks
• Before
  • Authentication
  • Caching
  • Auditing
  • Loading & Assigns
• After
  • Output compression

This is the code example in the PDF:

 class LoginController < AbstractApplicationController
   # Shows login and any alerts, such as "Invalid login" 
   def index
     if @account.active? then render else render "login/inactive_account" end
   end

   # Authenticates that a person responding to the user_name/password combo is allowed
   # to login to the extranet belonging to the current firm. If that person comes from
   # the client, he's redirected to that clients project overview (or straight to the
   # project if only one exists). If that person comes from the firm, he's redirected
   # to the firm's overview of clients and projects (also known as the dashboard).
   def authenticate
     if person = Person.authenticate(params["user_name"], params["password"], @firm.id)
       session["person"] = person

       person.last_login = Time.now.gmtime
       person.save

       if person.kind_of?(\ClientEmployee)
         client_login(Client.find(person.client_id))
       else
         firm_login
       end
     else
       self.alert = "The username and/or password you entered is invalid." 
       redirect_action "index" 
     end
   end

   # Shows just the user name box
   def forgot_password
   end