Rails - Dec 2008 - update parent in assocation callback

I''d like to update an attribute on the parent using an association
callback.  For example

class User < ActiveRecord::Base
  has_many :peeps, :after_add => :update_latest_peep


  protected
    def update_latest_peep(peep)
      self.latest_peed_id= peep.id
    end
end

If I debug and step through the code, I see that @owner (which is the
user in question) actually does have that attribute set however when the
code exists, it doesn''t seem to save.

Thanks.
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