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If you've used Rails, it's a safe bet to say that you've used Active Record. Active Record isn't the only ruby tool out there for manipulating your database though, and Rails 3 will play nicer than ever with other ORM libraries. Find out the similarities between some of the common ORM libraries, their differences and what makes them tick.
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I'm Frederick Cheung, a UK based rails developer (fglc2 on twitter). I'm the CTO at dressipi, where we're revolutionising the way women shop for clothes. In the past I've written Mac desktop software, iOS apps and contributed to rails itself.