Rails - Apr 2006 - Association extensions: how to access the object?

With association extensions, like user.items.tagged("foo"), how do I 
access the "user" object from within the extension method? The code 
would be e.g.

  class User < ActiveRecord::Base
    has_and_belongs_to_many :items do
      def tagged(tag)
        return "These are items tagged %s from user %s." % [tag, ???]
      end
  end

but how would I get a hold of the user in question, within that method?

Since "self" in the method refers to the "items" collection,
I can do
self[0].user, but that seems very much like a hack, and will obviously 
not work if the items collection is empty.

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