Description
http://docs.mongodb.org/manual/tutorial/model-data-for-atomic-operations/ page does not demonstrate or explain why they need findAndModify and not update for this - contributing to mistaken impression that update is not by itself atomic
http://docs.mongodb.org/manual/tutorial/model-data-for-atomic-operations/ page does not demonstrate or explain why they need findAndModify and not update for this - contributing to mistaken impression that update is not by itself atomic