Issue with composite_primary_keys and find_in_batches. In short, they don't play nicely together.
Issue:
Rails 2.3+ find_in_batches will not work if your model has composite primary keys.
Solution:
I found this gist:
https://gist.github.com/105318/13fe7c42c95c820fadbad84d54e00680ce9d110f
which solved the issue. I just dropped it into a file in RAILS_ROOT/config/initializers to extend active record to be able to do batch finds on those models which use composite_primary_keys
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