title: binding.pry ignored by rails 3
body: <p>I'm trying to debug my little app failing to create a Price because of an AssociationTypeMismatch. So I dig out pry, install, watch railscast and Josh's screencast and dig into the wiki.</p>
  
  <p>I "cd" into the prices controller but that fails. I've put &lt;% binding.pry %> into the new.html before the submit code but Rails says that the 'pry' method is unknown. pry is in my updated Gemfile and I restarted the server.</p>
  
  <p>I put binding.pry into the create method of my prices_controller.rb and Rails happily breezes through it to throw the error I've already seen, not the pause, etc I was expecting.</p>
  
  <p>Looking at the Price model, I'm not experienced enough to know what I should be looking for. What am I overlooking? thanx, sam</p>