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Resourcen:

• Devise
• Episode 209: Introducing Devise
• Episode 192: Authorization with CanCan
• Episode 30: Pretty Page Title
• Full episode source code

Quellcode:

rails generate devise_views
rails generate migration add_username_to_users username:string
rake db:migrate
rails c

# projects_controller.rb
before_filter :authenticate_user!, :except => [:show, :index]

# routes.rb
devise_for :users, :path_names => { :sign_up => "register" }

# config/initializers/devise.rb
config.authentication_keys = [ :username ]
config.password_length = 4..20

<!-- devise/sessions/new.html.erb -->
<% title "Sign in" %>

<%= form_for(resource_name, resource, :url => session_path(resource_name)) do |f| %>
  <p><%= f.label :username %><br />
  <%= f.text_field :username %></p>

  <p><%= f.label :password %><br />
  <%= f.password_field :password %></p>

  <!-- ... -->
<% end %>