Memcached action caching for Sinatra (doesn't work in sinatra >= 1.0)

cache.rb

# Adds support for passing a :cache parameter to action definitions, eg:
# 
#   get '/state_map/?', :cache => 'state_map' do
#     ...
#   end
# 
# :cache can also simply be passed true, in which case the route definition is used as the base 
# key name.  In all cases, any params are also included in the key.
#   
# Author: ben tucker <ben@btucker.net>
# Based on code from: http://railsillustrated.com/blazing-fast-sinatra-with-memcached.html
# Requires: http://github.com/gioext/sinatra-memcache

require 'sinatra/memcache'
require 'digest/md5'

module CacheableRoute
  def self.included(base)
    base.extend ClassMethods
    base.class_eval do
      class << self
        alias_method  :route_without_caching, :route unless method_defined?(:route_without_caching)
        alias_method :route, :route_with_caching
      end
    end 
  end
  module ClassMethods
    def route_with_caching(verb, path, options={}, &block)
      if cache_key = options.delete(:cache)
        cache_key = path if cache_key === true
        def wrap_block(key,block)
          Proc.new do
            cache("#{key}/#{params.to_a.sort.join("/")}") { instance_eval(&block) }
          end
        end
        block = wrap_block(cache_key, block)
      end
      route_without_caching(verb, path, options, &block)
    end
  end 
end


class Sinatra::Base
  include CacheableRoute
end

This works like a charm for me on stand-alone sinatra application. But when I try to Rack it up, I get the following error

undefined method `cache' for #WhateverApp:0xb71b9d6c

* file: cache.rb
* location: GET /categories
* line: 33

Apparently, it doesn't find the method "cache" under Sinatra::MemCache::Helpers. How do I fix this?

Yeah, I think this stopped working around Sinatra 1.0 (could be wrong) We ended up abandoning the approach and just using the cache method directly in each action. Not as pretty, but it works.