A patch/plugin that you might be interested in:
nested_has_many_through (was at
http://dev.rubyonrails.org/ticket/6461)
I've started working on it (hopefully others will collaborate) to get
it edge compliant and well speced, if you;re interested it's at
http://github.com/ianwhite/nested_has_many_through
Cheers,
Ian
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