cache just content on items, not action, so we can still use title and canonical

app/controllers/items_controller.rb

@@ -1,6 +1,5 @@
 class ItemsController < ApplicationController
   before_filter :set_query
-  caches_action :show, :layout => false
 
   def index
     if params.has_key?(:q)
@@ -61,3 +60,4 @@ class ItemsController < ApplicationController
     @query = params[:q]
   end
 end
+

app/views/items/show.html.haml

@@ -2,6 +2,7 @@
 - content_for :meta do
   %link{:rel => 'canonical', :href => url_for(@item)}
 
+- cache "items_show_#{@item.id}_main_content" do
   %header
     = image_tag @item.thumbnail_url, :id => 'item-thumbnail'
     %div

app/views/layouts/items.html.haml

@@ -9,3 +9,4 @@
     = submit_tag 'Search', :name => nil
   = yield
 = render :file => 'layouts/application'
+