Hello,
I have made an example app using Rails4 + ExtJS 4.1. For the authentication, I used Devise. For authorization, I used the_role gem.
The app is live at teamsheet.herokuapp.com
The source code + install instruction can be found at
The app description can be found at: http://weyewe.com/rails-extjs-timesheet-tracker
Feel free to fork or ask more questions