Using findOne in mongodb to get element with max id

Question

I am trying to retrieve one element from a mongo collection, the one with the greatest _id field. I know this can be done by querying:

db.collection.find().s         


        

Answer 1

You can get max _id using aggregation of mongodb. Find and sort may overkill's.

db.myCollection.aggregate({
    $group: {
        _id: '',
        last: {
            $max: "$_id"
        }
    }
});