better cache items#show

app/models/item_observer.rb

@@ -22,6 +22,8 @@ class ItemObserver < ActionController::Caching::Sweeper
   
   def expire_cache_for(item)
     controller.expire_fragment("items/#{item.id}#item_link_partial")
+    controller.expire_fragment("items/#{item.id} header")
+    controller.expire_fragment("items/#{item.id} info")
   end
   
   def expire_newest_items

app/views/items/show.html.haml

@@ -1,6 +1,7 @@
 - title @item.name
 - canonical_path @item
 
+- cache "items/#{@item.id} header" do
   %header#item-header
     = image_tag @item.thumbnail_url, :id => 'item-thumbnail'
     %div
@@ -43,6 +44,8 @@
                   = label_tag "quantity[#{owned}]" do
                     How many?
       = submit_tag 'Save to Your Items'
+
+- cache "items/#{@item.id} info" do
   %p= @item.description
 
   #item-zones
@@ -86,7 +89,7 @@
         %span.more more
         %span.less less
 
-
+- cache 'items#show preview_header' do
   #item-preview-header
     %h3 Preview
     %a#customize-more.button{:href => '/'} Customize more