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Error after upgrading to version 2.0.0 if you use uuid for primary keys in rails

If you are using UUIDTools for unique ids for your objects and you followed a tutorial like this one, then you may be surprised by this error:

  undefined method `timestamp_create' for UUID:Class

after upgrading. You should edit uuid_helper.rb in your app/helpers directory and replace this line:

    self.id = UUID.timestamp_create().to_s

by the following one

    self.id = UUIDTools::UUID.timestamp_create().to_s

so it might look like this:

require 'rubygems'
require 'uuidtools'
module UUIDHelper
  def before_create()
    self.id = UUIDTools::UUID.timestamp_create().to_s
   end
end