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If we need to do anything at the driver level, it's time to implement it since 2.2 release candidate is out.
I'd like to do this implementation, did anybody start something?
No one has started anything yet. Should be pretty easy and work just like the way we did $findAndModify - I'm thinking just an #aggregate method on Moped::Query that sets up the necessary command if you want to go for it.
ok, I will start working on it.
Support for aggregation Framework [#49]
Closing as we have the pull request.