cache.rb

### NOTES
# This simple cache extension/class works fine in classic_app.rb below.
#
# However, when trying it in the new_app.rb (sub-classed Sinatra) it throws:
# 
#  NoMethodError: undefined method ‘set’ for Sinatra::Cache:Module
# 
# Been re-reading [ http://www.sinatrarb.com/extensions.html ] but still not been able to work out 
# what's wrong inside this code.
#
###

require 'sinatra/base'

module Sinatra
  
  module Cache
    
    set :cache_enabled, false
    
    
    def cache(something)
      if self.cache_enabled
        "I SHOULD CACHE THIS = [#{something}]"
      else
        "CACHE DISABLED: I'M IGNORING THIS = [#{something}]"
      end
    end
    
    private
      
      def private_cache(something)
        "I'm private [#{something}]"
      end
      
      
  end #/module Cache
  
  register(Cache)
  
end #/module Sinatra

classic_app.rb

APP_ROOT = File.expand_path(File.dirname(__FILE__)) unless defined?(APP_ROOT)
# need to vendor Sinatra since the gem does NOT support new register features yet.
vendor_sinatra = "#{File.dirname(File.dirname(APP_ROOT))}/vendor/sinatra"
libdir = File.dirname(File.dirname(APP_ROOT)) + '/lib'
$LOAD_PATH.unshift "#{vendor_sinatra}/lib" if test(?d, vendor_sinatra)
$LOAD_PATH.unshift libdir unless $LOAD_PATH.include?(libdir)

require 'rubygems'
require 'sinatra'
require 'sinatra/cache'

enable :static, :logging
enable :reloading if development?

set :app_file,  __FILE__
set :views,  "#{APP_ROOT}/views"

set :cache_enabled, true

helpers do
  #  NOTE:: in Classic apps you still need to include the Rack::Utils. Why? 
  include Rack::Utils
  alias_method :h, :escape_html
  # ... more helpers ...
end

# type anything you want in the URL
get '/:dynamic/?:value?' do
  content =  "Dynamic Page with :dynamic=[#{params[:dynamic]}]"
  content += " and :value=[#{:value}]}" unless params[:value].nil?
  content += " and Time now is [#{Time.now.strftime("%Y-%d-%m %H:%M:%S")}]"
  cache(erb( content))
end

new_app.rb

APP_ROOT = File.expand_path(File.dirname(__FILE__)) unless defined?(APP_ROOT)
# need to vendor Sinatra since the gem does NOT support new register features yet.
vendor_sinatra = "#{File.dirname(File.dirname(APP_ROOT))}/vendor/sinatra"
libdir = File.dirname(File.dirname(APP_ROOT)) + '/lib'
$LOAD_PATH.unshift "#{vendor_sinatra}/lib" if test(?d, vendor_sinatra)
$LOAD_PATH.unshift libdir unless $LOAD_PATH.include?(libdir)

require 'rubygems'
require 'sinatra/base'
require 'sinatra/cache'

class MyApp < Sinatra::Base
# class MyApp < Sinatra::Default # TEMPORARY FIX?
  register Sinatra::Cache
  
  enable :static, :logging
  enable :reloading if development?

  set :app_file,  __FILE__
  set :views,  "#{APP_ROOT}/views"

  set :cache_enabled, true

  alias_method :h, :escape_html
  # ... more helpers ...

  # type anything you want in the URL
  get '/:dynamic/?:value?' do
    content =  "Dynamic Page with :dynamic=[#{params[:dynamic]}]"
    content += " and :value=[#{:value}]}" unless params[:value].nil?
    content += " and Time now is [#{Time.now.strftime("%Y-%d-%m %H:%M:%S")}]"
    cache(erb( content))
  end
  
end

# run only in CLI mode, otherwise skip
if $0 == __FILE__
  MyApp.run! unless MyApp.reloading?
end