Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{_id:"43434",heroes:[{nickname:"test",items:["","",""]},{nickname:"test2",items:["","",""]},]}]
Query
db.collection.update({"heroes.nickname":"test"},{$set:{"heroes.$.items.1":"new_value"}},{multi:true})
Result