title: How can I view list of permitted params using Rails strong_parameters?
body: <p>I'm in the process of migrating from a Rails 3 application up to Rails 4 and making the changes to strong parameters.  During this process I've been doing some command line debugging and would like to be able to view of list of all currently permitted parameters.</p>
  
  <p>I was thinking this would work something like this.</p>
  
  <p><code>params.permitted?</code></p>
  
  <p>I've looked at the docs and googled, but have come up empty.</p>