Rails - Mar 2011 - how to select all categories select name only , subcategories select name only, limit X items

I have 3 models where ''Categories'' have many
''Sub-Categories'' and many
''Items'' through ''Sub Categories''.
What is a standard Rails 3 way of showing latest few ''items''
from each
''sub-categories'' that belongs to
''categories''.
So in my view I''d have something like:
category: Music
     sub-category: Classical
            items: mozart, bach (sorted by created_at)
     sub-category:Rock
    ......
Category: Film....

So I would want: all categories select name only , subcategories select
name only, limit X items

Thanks,
Mark

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