title: Converting string from snake_case to CamelCase in Ruby
body: <p>I am trying to convert a name from snake case to camel case. Are there any built-in methods?</p>
  
  <p>Eg: <code>"app_user"</code> to <code>"AppUser"</code></p>
  
  <p>(I have a string <code>"app_user"</code> I want to convert that to model <code>AppUser</code>).</p>