Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{arr:[{age:24},{age:55}]},{arr:[{age:12},{age:14},{age:17}]},{arr:[{age:11},{age:13},{age:20}]}]
Query
db.collection.find({"arr.age":{$not:{$gt:50}}},{arr:{$first:"$arr"}})
Result