Mongodb - mongoose, sort by summing two fields
In mongodb aggregation, this can be achieved through the $project operator. The newField is added via the $project operator pipeline stage with the $add arithmetic operator which adds the two fields. The sorting is done through the $sort pipeline step:
var pipeline = [ { "$project": { "points": 1, "extraPoints": 1, "newField": { "$add": [ "$points", "$extraPoints" ] } }, { "$sort": { "newField": 1 } } ];model.User.aggregate(pipeline, function (err, res) { if (err) return handleError(err); console.log(res); });// Or use the aggregation pipeline builder.model.User.aggregate() .project({ "points": 1, "extraPoints": 1, "newField": { "$add": [ "$points", "$extraPoints" ] } }) .sort("newField") .exec(function (err, res) { if (err) return handleError(err); console.log(res); });