cheat sheets.

Resource Routes (in config/routes.rb)
  Simple
   map.resources :users, :sessions 

  Nested
    map.resources :teams do |teams| 
      teams.resources :players 
    end 

  Customized
    map.resources :articles, 
                  :collection  => {:sort => :put}, 
                  :member      => {:deactivate => :delete}, 
                  :new         => {:preview => :post}, 
                  :controller  => 'articles', 
                  :singular    => 'article', 
                  :path_prefix => '/book/:book_id', 
                  :name_prefix => 'book_' 

  Including the default route (/:controller/:action/:id) will allow any verb to
  access any action. This is usually not what you want, so you should probably 
  delete it from routes.rb 

| Standard Methods       | Verb   | Path          | Action  |
|------------------------|--------|---------------|---------|
|       plural_path      | GET    | /teams        | index   |
|     singular_path(id)  | GET    | /teams/1      | show    |
| new_singular_path      | GET    | /teams/new    | new     |
|       plural_path      | POST   | /teams        | create  |
| edit_singular_path(id) | GET    | /teams/1;edit | edit    |
|      singular_path(id) | PUT    | /teams/1      | update  |
|      singular_path(id) | DELETE | /teams/1      | destroy |

  Each method also has a counterpart ending in _url that includes the protocol,
  domain, and port. There is also a hash_for_ version of each method that 
  returns a hash instead of a string.

| Formats in the URL                         | Path                  |
|--------------------------------------------|-----------------------|
| formatted_plural_path(:xml)                | /teams.xml            |
| formatted_singular_path(id, :rss)          | /teams.1.rss          |
| formatted_players_path(@team, :atom)       | /teams/1/players.atom |
| formatted_player_path(@team, @player, :js) | /teams/1/players/5.js |
| formatted_player_path(:team_id => 1,       | /teams/1/players/5.js |
|               id => 5, :format => :js)     |                       |

  Any URL-generating method can take a hash of options instead of bare 
  arguments. This is the only way to generate a URL with extra querystring 
  params.

button_to "Destroy", 
          team_path(@team), 
          :confirm => "Are you sure?", 
          :method => :delete 

link_to "Destroy", 
        team_path(@team), 
        :confirm => "Are you sure?", 
        :method => :delete

link_to_remote "Destroy", 
               :url => team_path(@team), 
               :confirm => "Are you sure?", 
               :method => :delete

form_for :team, 
         @team, 
         :url => team_path(@team), 
         :html => { 
           :method => :put 
         } do |f| ... 

| Nested Resources            | Path                        |
|-----------------------------|-----------------------------|
| players_path(@team)         | /teams/:team_id/players     |
|                             | /teams/1/players            |
| player_path(@team, @player) | /teams/:team_id/players/:id |
|                             | /teams/1/players/5          |

  Nested resources must be defined in routes.rb. See above for an example.

Useful Plugins
* Beast Forum (an app built with RESTful design) 
    http://svn.techno-weenie.net/projects/beast/trunk/
* RESTFUL Authentication Plugin 
    http://svn.techno-weenie.net/projects/plugins/restful_authentication/
* Simply Helpful Plugin 
    http://dev.rubyonrails.org/svn/rails/plugins/simply_helpful/

respond_to { |wants| 
  wants.all | .text | .html | .js | .ics | .xml | .rss | .atom | .yaml 
}

Add New MIME types (in config/initializers/mime.rb)
  Mime::Type.register "image/jpg", :jpg
  Mime::Type.register "application/vnd.visa+xml", :visa

  Types listed here can be used in a respond_to block and as a forced format 
  extension at the end of urls.

Scaffold Resource Generator
  ./script/generate scaffold
                    Episode
                    title:string
                    description:text
                    program_id:integer

  Use a singular word for the model/resource name. The other arguments will be 
  used to pre-populate the database migration and fields in view templates.

Mostly from http://peepcode.com/articles/2006/10/08/restful-rails