Rails - Oct 2010 - AssociationTypeMismatch / Model Caching in development envirnment

Hi there—

I''m trying to get started with Rails, and I''ve run into this
issue and
searched high and low--so hopefully someone can help point me in the
right direction.

I''m having an issue where my model classes seem to be getting cached by
something, and so if I make subsequent requests, I get an
AssociationTypeMismatch error.  To be specific, on update is where it
fails, and I get:

ActiveRecord::AssociationTypeMismatch in ArticlesController#update
Category(#2159283720) expected, got Category(#2154954600)

So sometimes this is successful, and the POST requests are identical.

I can change the ''config.cache_classes = false'' to true in the
config/environments/development to true and i won''t get the error
anymore, but then I have to reload the server every time I make a
change.

I read that plugins could be caching it since they don''t reload for
every
request, but I don''t think I''m using any plugins, so
I''m guessing that
isn''t it.

I can''t figure out where to look next and would appreciate any help you
can offer.

I''m running Ruby 1.9.2p0 and Rails 3.0.1 on OS X 10.6.4.  You can
download the code that I''m trying to work on at
http://github.com/downloads/ccjr/blog/chapter08.zip (I''m trying to work
through this Apress book).  When you load up the page, you need to log
in to edit, and the login is
''mary-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org'' :
''guessit''.

Any pointers or ideas?

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