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Abstract Factories along with ActiveRecord

How to extract SQL aggregations into abstract factories keeping your model clean.

Pattern description and discussion.

I just encountered and solved an interesting problem that I'd like to discuss in a talk next meetup if someone's interested. I ended up with a beautiful solution, imho.

The problem appeared in a statistics timeline apllication and there's ruby code to show. ;) I didn't find anything comparable on the interwebs, so I'd like to present my solution and discuss it with the audience.

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