"_id" in Object fields is being renamed to "objectId"

[blacha]

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Environment Setup

Test Schema

{
    "_id" : "Test",
    "objectId" : "string",
    "updatedAt" : "string",
    "createdAt" : "string",
    "data" : "object"
}

Test Data

{
    "_id" : "tqwysmYbjP",
    "data" : {
        "_id": "testObjectKey",
        "arr" : [ {
                "_id" : "testArrayKey",
                "_testKey" : "otherKey"
            }],
        "obj": {
            "_id": "testNestedObjectKey"
        }
    },
    "_updated_at" : ISODate("2016-04-07T04:22:47.653Z"),
    "_created_at" : ISODate("2016-04-07T04:22:47.653Z")
}

When querying this Class the output I receive is:

{
    "results": [{
        "objectId": "tqwysmYbjP",
        "data": {
            "objectId": "testObjectKey",
            "arr": [{
                "objectId": "testArrayKey",
                "_testKey": "otherKey"
            }],
            "obj": {
                "objectId": "testNestedObjectKey"
            }
        },
        "updatedAt": "2016-04-07T04:22:47.653Z",
        "createdAt": "2016-04-07T04:22:47.653Z"
    }]
}

Steps to reproduce

Fetch the Test Class in parse dashboard/curl and look at the results.

Logs/Trace

N/A

[blacha]

With the same data on parse.com this is the output for the same query.

{
    "results": [
        {
            "createdAt": "2016-04-07T21:30:07.528Z",
            "data": {
                "_id": "testObjectKey",
                "arr": [
                    {
                        "_id": "testArrayKey",
                        "_testKey": "otherKey"
                    }
                ],
                "obj": {
                    "_id": "testNestedObjectKey"
                }
            },
            "objectId": "VvFMrOwBhF",
            "updatedAt": "2016-04-07T21:30:11.447Z"
        }
    ]
}

[blacha]

in transform.js keys are being renamed even when they are inside fields of type Object and Array.

What would happen if you stopped traversing these fields?

[drew-gross]

Verified. Working on a fix.