Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{_id:1111,age:"young",hobby:[{vehicle:"car",velocity:"fast"},{vehicle:"motorcycle",velocity:"fast"}]}]
Query
db.collection.update({_id:1111},{$set:{"age":"old","hobby.0.velocity":"slow"}})
Result