Rails - Aug 2008 - Has_one with :source_type

I am trying to extend the classic example

class Magazine < ActiveRecord::Base
       has_many :subscriptions

       has_many  :rental_events ,
            :through => : subscriptions,
            :source => :redaer,
            :source_type => ''Business''

      has_many  :closing_events ,
            :through => : subscriptions,
            :source => :reader,
            :source_type => ''Person''
end

class Subscription < ActiveRecord::Base
	belongs_to :magazine
	belongs_to :reader, :polymorphic => true
end

class Business < ActiveRecord::Base
  	has_many : subscriptions, :as => :reader
  	has_one :magazine, :through => :subcription  <----  that''s
what I
want , only 1 magazine....
  end

class Person < ActiveRecord::Base
  	has_many : subscriptions, :as => :reader
  	has_one :magazine, :through => :subcription  <----  that''s
what I
want , only 1 magazine....
end

I can easily get    Person.first.subscriptions,  but I cannot get
Person.first.magazine  or Business.first.magazine

what''s wrong ? , thanks for your lights ..

erwin

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