MongoDb: find deeply nested object with $lookup

Question

I have collection like this: collection name is - account. and it has sub-documents like account > buildings > gateways > devices.

{
    \"_id\" : ObjectI         


        

Answer 1

You can find nested device using $filter, $arrayElemAt and $let:

device: {
    $let: {
        vars: {
            building: { 
                $arrayElemAt: [ { $filter: { input: "$company_name.buildings", cond: { $eq: [ "$$this._id", "$buildingId" ] }} }, 0 ] 
                }
        },
        in: {
            $let: {
                vars: {
                    gateway: {
                        $arrayElemAt: [ { $filter: { input: "$$building.gateways", cond: { $eq: [ "$$this._id", "$gatewayId" ] }} }, 0 ] 
                    }
                },
                in: { $arrayElemAt: [ { $filter: { input: "$$gateway.devices", cond: { $eq: [ "$$this._id", "$deviceId" ] }} }, 0 ] }
            }
        }
    }
}

Full Solution