Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{_id:1,"name":"tag 2"},{_id:2,"name":"tag 4"},{_id:3,"name":"tag 5"}]
Query
db.collection.update({name:"tag 1"},{$set:{name:"tag 1"}},{upsert:true})
Result