gistfile1.rb

   def check_username_is_allowed
     RESTRICTED_NAMES.each do |restricted|
-      errors.add(:username, "is not available") if
-      username =~ /#{restricted}/i unless errors.on(:username)
+      errors[:username] << "is not available" if
+      username =~ /#{restricted}/i unless errors[:username] and errors[:username].size != 0
     end
   end