adding simple patch as per https://groups.google.com/forum/#!topic/ca…

…nvas-lms-users/ROEFtqEnPrQ

ccutrer/canvas-lms@2d875ce

to resolve issue db migrations

db/migrate/20130524164516_add_number_to_versions_index.rb

@@ -13,7 +13,7 @@ def self.up
       find_each do |version|
         versionable_object_scope = Version.where(:versionable_id => version.versionable_id,
                                                  :versionable_type => version.versionable_type)
-        dups = versionable_object_scope.where(:number => row['number']).order(:created_at, :id).all
+        dups = versionable_object_scope.where(:number => version.number).order(:created_at, :id).all
         # leave the first one alone
         dups.shift
         next if dups.empty? # ???