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Resourcen:

• Declarative Authorization
• Rails Authorization Plugins
• Episode 160: Authologic
• Episode 17: HABTM Checkboxes
• Full Episode Source Code

Quellcode:

sudo rake gems:install

# config/environment.rb
config.gem "declarative_authorization", :source => "http://gemcutter.org"

# config/authorization_rules.rb
authorization do
  role :admin do
    has_permission_on [:articles, :comments], :to => [:index, :show, :new, :create, :edit, :update, :destroy]
  end

  role :guest do
    has_permission_on :articles, :to => [:index, :show]
    has_permission_on :comments, :to => [:new, :create]
    has_permission_on :comments, :to => [:edit, :update] do
      if_attribute :user => is { user }
    end
  end

  role :moderator do
    includes :guest
    has_permission_on :comments, :to => [:edit, :update]
  end

  role :author do
    includes :guest
    has_permission_on :articles, :to => [:new, :create]
    has_permission_on :articles, :to => [:edit, :update] do
      if_attribute :user => is { user }
    end
  end
end

# application_controller.rb
before_filter { |c| Authorization.current_user = c.current_user }

protected

def permission_denied
  flash[:error] = "Sorry, you are not allowed to access that page."
  redirect_to root_url
end

# articles_controller.rb
filter_resource_access

<!-- articles/show.html.erb -->
<p>
  <% if permitted_to? :edit, @article %>
    <%= link_to "Edit", edit_article_path(@article) %> |
  <% end %>
  <% if permitted_to? :destroy, @article %>
    <%= link_to "Destroy", @article, :method => :delete, :confirm => "Are you sure?" %> |
  <% end %>
  <%= link_to "Back to Articles", articles_path %>
</p>
...
<p>
  <% if permitted_to? :edit, comment %>
    <%= link_to "Edit", edit_comment_path(comment) %>
  <% end %>
  <% if permitted_to? :destroy, comment %>
    | <%= link_to "Destroy", comment, :method => :delete, :confirm => "Are you sure?" %>
  <% end %>
</p>

<!-- articles/index.html.erb -->
<% if permitted_to? :create, Article.new %>
  <p><%= link_to "New Article", new_article_path %></p>
<% end %>