Rails - Jan 2008 - "value must be enumerable" exception when using a sweeper?

Folks,

I''m going slightly crazy here - I implemented a Sweeper in an older app
and used nearly the same exact code in my new app, yet I keep getting
this ''value must be enumerable'' exception. Even after I cut
most of the
code away, I still get the error. If anyone can help, I would be much
obliged.

Notes: I''m using Engines... wonder if that could cause a problem. And
yet, if I ''observe'' my User model, which is part of my main
app and not
an engine or plugin, it still gives me the same exception.

Thanks!

--------------------

application.rb:

cache_sweeper :commerce_sweeper

--------------------

commerce_sweeper.rb:

class CommerceSweeper < ActionController::Caching::Sweeper
  observe Product

  def after_save(record)
  end
end

--------------------

exception:

C:/dev/ruby/lib/ruby/1.8/set.rb:275:in `+''
C:/dev/ruby/lib/ruby/gems/1.8/gems/activerecord-1.15.5/lib/active_record/observer.rb:149:in
`initialize''
C:/dev/ruby/lib/ruby/1.8/singleton.rb:95:in `new''
C:/dev/ruby/lib/ruby/1.8/singleton.rb:95:in `instance''
C:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/caching.rb:570:in
`cache_sweeper''
C:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/caching.rb:568:in
`each''
C:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/caching.rb:568:in
`cache_sweeper''
C:/dev/workspace/BocueCommerce/app/controllers/application.rb:12
-- 
Posted via http://www.ruby-forum.com/.

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