Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"id":1,"name":"apple","type":["Granny smith","Fuji"]},{"id":2,"name":"grape","type":["green","black"]},{"id":3,"name":"orange","type":["navel"]}]
Query
db.collection.find({type:{"$size":2}},{name:1})
Result