mongodb - Mongo group inside $addToSet -

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i have following set of objects:

 [     {       id: 1,       clientid: 1,       cost: 200     },     {       id: 1,       clientid: 2,       cost: 500     },     {       id: 1,       clientid: 2,       cost: 800     },     {       id: 2,       clientid: 1,       cost: 600     },     {       id: 2,       clientid: 2,       cost: 100     } ]

and made group of with:

db.collection.aggregate(    {      '$group': {         '_id': '$id',         'clients': {            '$addtoset': {               'id': '$clientid',               'cost': '$cost'             }         }       }    } )

so obteined following:

[     {         '_id': 1,         'clients': [             {                 id: 1,                 cost: 200             },             {                 id: 2,                 cost: 500             },             {                 id: 2,                 cost: 800             }         ],         '_id': 2,         'clients': [             {                 id: 1,                 cost: 600             },             {                 id: 2,                 cost: 100             }         ]     } ]

as can see in array of clients of first value, have 2 repeated , want have 1 cost added. instead of have:

'clients': [                 {                     id: 1,                     cost: 200                 },                 {                     id: 2,                     cost: 500                 },                 {                     id: 2,                     cost: 800                 }             ]

i need:

'clients': [                 {                     id: 1,                     cost: 200                 },                 {                     id: 2,                     cost: 1300                 }             ]

so question is: how can that? because $addtoset nor $push allow $sum.

you can use aggregation operators expected output following:

db.collection.aggregate({     "$group": {     "_id": {         "mainid": "$id",         "client": "$clientid"     },     "cost": {         "$sum": "$cost"     }     } }, {     "$project": {     "mainid": "$_id.mainid",     "clients": {         "clientid": "$_id.client",         "cost": "$cost"     },     "_id": 0     } }, {     "$group": {     "_id": "$mainid",     "clients": {         "$push": "$clients"     }     } })

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