title: List all Mongoid models in Rails console
body: <p>I want to list all the models which have a respective collection in my mongodb database? I'm using <code>mongoid</code> gem for for MongoDB.</p>
  
  <p>I would try something like this</p>
  
  <p><code>ActiveRecord::Base.send :subclasses</code>
  which works fine, but I'm not using ActiveRecord.</p>