Mongoose sum aggregation -

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i have mongoose schema sum of sizes based on creator.

creator: { type: schema.types.objectid, ref: 'user' }, archives: [{     archiveid: string,      url: string,     name: string,     size: number,     isset: { type: boolean, default: false },     timestamp: { type: date, default: date.now() } }]

this have tried far, total keeps coming 0

var objectid = require('mongoose').types.objectid;     archivemodel.aggregate(         {             $match: {                 'creator': new objectid(creatorid),             }         },         {             $group: {                 _id: null,                 total: {$sum: '$archives.size'}             }         },         {              $project: {                 creator: 1,                 total: 1              }          }, function(err, result) {              console.log(err);             console.log(result);         }      ); 

db.col.aggregate([     // match docs right creator     {$match: {creator: my_creator}},      // array of arrays single array     {$unwind: '$archives'},     // count of docs     {$group: {_id: 'total', count: {$sum: 1}}} ]);

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