Rails core - Nov 2008 - has_one :through with decorated join model saves incorrectly

I''ve run into a problem with has_one :through and additional  
attributes on the ''through'' model.

Tests and further description at:
http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/1376

Thanks,

--Matt Jones

---
Ticket summary:

The attached patch is several failing tests that show a problem with  
using has_one :through with a decorated model.

Models are:

# simplified for readability - see full model in source
class Member < ActiveRecord::Base
has_one :member_detail
   has_one :organization, :through => :member_detail
end

class MemberDetail < ActiveRecord::Base
   # has additional string field ''extra_data''
   belongs_to :member
   belongs_to :organization
end

class Organization < ActiveRecord::Base
   has_many :member_details
   has_many :members, :through => :member_details
end
The problem appears when you create a member, add a member_detail to  
it, and then add it to an organization. Either two MemberDetails get  
created, or one is created without the extra_data field set correctly.

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