Simple use of Dalli gem to implement caching using memcached in a Sinatra Application.

my_blog.rb

require 'rubygems'
require 'sinatra/base'
require 'sinatra/content_for'
require 'dalli'

class MyBlog < Sinatra::Base
  helpers Sinatra::ContentFor
  set :dc, Dalli::Client.new('localhost:11211')

  get '/articles/:id' do
    # ..............
    post_id = params[:id]
    key = "post_#{post_id}"
    @article = settings.dc.get(key) || set_cache(key, Article.find(post_id))
    # ..............
  end

  def set_cache key, value
    settings.dc.set(key, value)
    return value
  end
end