Scal dwa pola tablicy w mongoDB

Korzystanie z .aggregate() metoda i $setUnion operatora.

db.collection.aggregate([
    { "$project": { 
        "attribute3": { "$setUnion": [ "$attribute1", "$attribute2" ] } 
    }}
])

Co daje:

{
    "_id" : ObjectId("52f0795a58c5061aa34d436a"),
    "attribute3" : [8, 4, 2, 6, 3, 7, 1]
}