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 = capture(&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</span>) <span class="dl">%&gt;</span></span> |
  <span class="il"><span class="dl">&lt;%=</span> link_to <span class="s"><span class="dl">&quot;</span><span class="k">Destroy</span><span class="dl">&quot;</span></span>, <span class="iv">product, :confirm => "Are you sure?", :method => :delete %> |

  <%= link_to "View All", products_path %>
<% end %>