On May 7, 2010, at 16:02 , Chris McCann wrote:

> This seems like a trivial problem but I'll be darned if I can get it
> to work using ActiveRecord methods.


tl;dr :-) but I generally find when I start wondering about things like this 
that some custom SQL is usually the best answer, and will usually be 
considerably more efficient than doing it with Rails anyway.

Regards,

Guyren G Howe
Relevant Logic LLC

guyren-at-relevantlogic.com ~ http://relevantlogic.com ~ +1 512 784 3178

Ruby/Rails,  REALbasic, PHP programming
PostgreSQL, MySQL database design and consulting
Technical writing and training

Read my book, Real OOP with REALbasic: 
<http://relevantlogic.com/oop-book/about-the-oop-book.php>

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