[SERVER-47935] findOneAndUpdate and update insert objects instead of arrays despite using array indexes in paths - MongoDB Jira

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this.service.db.collection(this.config.mongodb.collections.campaigns)

.findOneAndUpdate({ 'metadata.campaign_id': '123' }, { $set:

            'status.type.0.documentOne': {

                in_sync: true

},

             'status.type.0.documentTwo': {

                in_sync: false

);

The above code will create `status.type` as an `Object`, whereas this command when run in a shell:

db.getCollection('campaigns').findOneAndUpdate({ 'metadata.campaign_id': '123' },

    $set: {    'status.type.0.documentOne': {        in_sync: true    },

    'status.type.0.documentTwo': {        in_sync: false    }})

Will create `status.type` as an Array.

db.isMaster() results:

    "ismaster" : true,

    "maxBsonObjectSize" : 16777216,

    "maxMessageSizeBytes" : 48000000,

    "maxWriteBatchSize" : 100000,

    "localTime" : ISODate("2019-11-25T22:15:38.241Z"),

    "logicalSessionTimeoutMinutes" : 30,

    "connectionId" : 405472,

    "minWireVersion" : 0,

    "maxWireVersion" : 8,

    "readOnly" : false,

    "ok" : 1.0

is related to

SERVER-27442 Positional path component in match language should not act as both an array index and a field name for a single document

SERVER-24748 Aggregation does not provide a way to access a specific element of an array