Rails - Jun 2012 - move to AR 3.2.1, now thread behaves differently

I have this piece of code below. It used to work fine, I was using
active record 2.3.8. I upgraded to
active record 3.2.1 and moved some gems into a gemfile. Now what
happens is rec below is an active record instance, when I enter the
thread it appears to become nil. The method repopulate() is not longer
defined. Why would that happen ?

...
...
  def new_thread(slot,&block)
    th = Thread.new(&block)
    @pool[slot] = th
  end

...
...

  p rec.respond_to?(:repopulate) # this is fine
  @tpool.new_thread(slot) do # see method definition above
       Thread.current[:rset_fact] = model
       puts ''in thread''
       p rec.respond_to?(:repopulate) # no longer defined
       rec.repopulate # error rec is nil
  end







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