title: rails : Same login for multiple models
body: <p>I am working on a rails application and using 'devise'for authentication , I have different models ( admin - user ) and I need only one login page</p>
  
  <p>In my case making an admin role or using single table inheritance (STI) is not effective as user and admin don't have much in common 
  so is there a better solution for my problem</p>