added a few things here. Firstly, I fixed the broken delete function with the admin page. Secondly, whenever you register for this application, we will automatically populate your user data to make the application functional. Seemed like the easiest way to do this

app/models/performance.rb

@@ -1,4 +1,8 @@
 class Performance < ActiveRecord::Base
   attr_accessible :comments, :date_submitted, :reviewer, :score
   belongs_to :user  
+  
+  def reviewer_name
+   User.find_by_id(self.reviewer).full_name
+  end
 end