Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"propertyId":12345,"type":"STORE"},{"propertyId":12345,"type":"STORE"}]
Query
db.collection.aggregate([{"$group":{"_id":"$element","doc":{"$first":"$$ROOT"}}},{"$replaceRoot":{"newRoot":"$doc"}}])
Result