title: User Messaging with RoR and Mongoid
body: <p>i searched the web now several hours but get no clear answer.</p>
  
  <p>I have a Rails-App (Ruby 1.9.3/Rails 3.2.2/MongoDB) which uses Devise as User-Authorization.</p>
  
  <p>Now i'd like to have a simple messaging function between users: 1 to 1 and 1 to n.</p>
  
  <p>Are there any gems that fulfill this need and support Mongo or are there any tutorials or best practices for this?</p>
  
  <p>Maybe relevant too: In the next step i plan to make the messages available in an iOS and Android App (both native) too.</p>