Rails - Feb 2009 - has_one through with new record

I need to set a has_one through association to an unsaved record. In
my code

--
  class JobPositionPosting < ActiveRecord::Base
    has_one :job_position_posting_hiring_org
    has_one :hiring_org, :through => :job_position_posting_hiring_org
  end

  class JobPositionPostingHiringOrg < ActiveRecord::Base
    belongs_to :job_position_posting
    belongs_to :hiring_org
  end

  class HiringOrg < ActiveRecord::Base
    has_many :job_position_posting_hiring_org
    has_many :job_position_posting, :through
=> :job_position_posting_hiring_org
  end

  job_position_posting = JobPositionPosting.new
  hiring_org = HiringOrg.new

  job_position_posting.hiring_org = hiring_org
--

, job_position_posting.hiring_org is always set to nil. If i save
job_position_posting and hiring_org everything works fine. How can i
realize an has_one :trough with new records?

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