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Resourcen:

• Rails 3.0: Second beta release
• Full episode source code

Quellcode:

rvm install ruby-head
rvm ruby-head
gem install rails --pre
bundle install

# Gemfile
gem "rails", "3.0.0.beta2"

# application_helper.rb
def admin_area(&block)
  content = with_output_buffer(&block)
  content_tag(:div, content, :class => "admin")
end
# or
def admin_area(&block)
  content_tag(:div, :class => "admin", &block) if admin?
end

<%= form_for @product do |f| %>
<% end %>

<%= div_for @product do %>
<% end %>

<% @comments.each do |c| %>
<% end %>

<% content_for :side do %>
<% end %>

<% cache do %>
<% end %>

<!-- products/show.html.erb -->
<%= admin_area do %>
  <%= link_to "Edit", edit_product_path(@product) %> |
  <%= link_to "Destroy", @product, :confirm => "Are you sure?", :method => :delete %> |
  <%= link_to "View All", products_path %>
<% end %>