Use event manager and registration compiler pass from Doctrine Bridge #80
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The problem was that doctrine-mongodb Connection services were never given an event manager, so they created a new event manager internally. The lack of event manager injection also meant that the compiler pass never attached listeners for doctrine-mongodb events (non-ODM events).
Given this limitation, I'm not sure how @jwage's Logging MongoDB Explains recipe could have worked, unless this problem does not exist for the bundle's Symfony 2.0-compatible version.