Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{tags:[{"tag":{"name":"A A"}},{"tag":{"name":"B B"}},{"tag":{"name":"C C"}}]}]
Query
db.collection.find({"tags.tag.name":"A A"},{"tags":{$elemMatch:{"tag.name":"A A"}}})
Result