title: Is Rails 3 removing Metal?
body: <p>Is Rails 3 removing Metal?</p>
  
  <p>I am trying to implement Mongoid, Carrierwave and grid_fs.</p>
  
  <p>I have followed <a href="http://socialmemorycomplex.net/2010/06/02/gridfs-with-mongoid-and-carrierwave-on-rails-3/" rel="noreferrer">guide 1</a>.</p>
  
  <p>However, I have read that Rails 3 is removing Metal ( <a href="http://github.com/rails/rails/commit/ed34652d1aca148fea61c5309c1bd5ff3a55abfa" rel="noreferrer">http://github.com/rails/rails/commit/ed34652d1aca148fea61c5309c1bd5ff3a55abfa</a> ).</p>
  
  <p>So I stumbled across this article instead: <a href="http://antekpiechnik.com/posts/setting-up-carrierwave-file-uploads-using-gridfs-on-rails-3-and-mongoid" rel="noreferrer">guide 2</a></p>
  
  <p>Given the circumstances that Rails 3 may be removing Metal and for future maintenance. Which guide is more suitable to get grid_fs, Mongoid and Carrierwave all working together?</p>