Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"Bread":6},{"Fruit":6},{"Cholate":4}]
Query
db.collection.aggregate([{"$set":{"root":{"$objectToArray":"$$ROOT"}}},{"$sort":{"root.k":1}},{"$project":{"root":0}}])
Result