title: Rails models and const_get
body: <p>Given a Rails model <code>Test</code> just created in a brand new Rails application:</p>
  
  <p>why can I do following? </p>
  
  <p><code>Test::const_get("Test")::const_get("Test")</code> (for as long as I want)</p>
  
  <p>or the following?</p>
  
  <p><code>Test::Test::Test</code> (for as long as I want)</p>