Rails - Nov 2006 - How does the polymorphic #{as}_type attribute get set in ActiveRecord models?

Hi people

I''m stumped.  I''ve been playing with a little patch to the  
ActiveRecord inheritance, and it''s broke a test, namely this one from  
associations/join_models_test.rb:

   def  
test_polymorphic_has_many_create_model_with_inheritance_and_custom_base_ 
class
     post = SubStiPost.create :title => ''SubStiPost'', :body
=>
''SubStiPost body''
     assert_instance_of SubStiPost, post

     tagging = tags(:misc).taggings.create(:taggable => post)
     assert_equal "SubStiPost", tagging.taggable_type
   end

It''s failing with <"SubStiPost"> expected but was
<"Post">.

I''ve deduced that "taggable_type" is stored as an attribute
of the
join model in has_many :through associations, but I can''t work out  
how it is calculated or set.  Is there an AR guru who can explain  
this bit to me?

Thanks
Ashley


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