MongoDB - Query on the last element of an array?

Question

I know that MongoDB supports the syntax find{array.0.field:\"value\"}, but I specifically want to do this for the last element in the array, which means I don\'

Answer 1

Version 3.6 use aggregation to achieve the same.

db.getCollection('deviceTrackerHistory').aggregate([
   {
     $match:{clientId:"12"}
   },
   {
     $project:
      {
         deviceId:1,
         recent: { $arrayElemAt: [ "$history", -1 ] }
      }
   }
])