[{"products":[{"_id":{"$oid":"5f948e5bd8615318f662d315"},"title":"BAND","price":16,"amount":25}],"totalPrice":416,"userId":{"$oid":"5f940f8876ad3e073a2e1e8b"},"__v":0}]

db.collection.update({},{"$addToSet":{products:[{"title":"foo","price":123,"amount":123}]},$set:{"totalPrice":539}})