title: Can I use cancan with many resources?
body: <p>I use devise and created two models, Doctor and Patient.
  When I write <code>load_and_authorize_resource</code> cancan gives an exception</p>
  
  <pre><code>undefined local variable or method `current_user
  </code></pre>
  
  <p>How can I use cancan for both of them? </p>