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

with PHP driver (mongodb)
using findOne()

$filter=[];
$options = ['sort' => ['_id' => -1]]; // -1 is for DESC
$result = $collection->findOne(filter, $options);
$maxAge = $result['age']