unwind is not working as expected.

json2csv version: ^4.5.2 node version: 10.16.0

const { Parser } = require('json2csv');
const fields = ['judgeName', 'source_product_id', 'target_products.product_id', 'target_products.score', 'time'];
const json2csvParser = new Parser({ fields, unwind: ['target_products'] });
const csvJudges = json2csvParser.parse(judges);

My data: judes:

[
    {
        "_id": "5d5a5170f9acfe362c61272c",
        "judgeName": "hunnyjmjim",
        "source_product_id": "323",
        "target_products": [
            {
                "_id": "5d5a5170f9acfe362c61272e",
                "product_id": "9096",
                "score": 1
            },
            {
                "_id": "5d5a5170f9acfe362c61272d",
                "product_id": "48484",
                "score": 2
            }
        ],
        "time": "2019-08-19T07:36:16.433Z",
        "__v": 0
    },
    {
        "_id": "5d5a83c91c9d440000e258df",
        "judgeName": "hunnyjmjimq",
        "source_product_id": "323",
        "target_products": [
            {
                "_id": "5d5a5170f9acfe362c61272e",
                "product_id": "9096",
                "score": 1
            },
            {
                "_id": "5d5a5170f9acfe362c61272d",
                "product_id": "48484",
                "score": 2
            }
        ],
        "time": "2019-08-12T07:36:16.433Z",
        "__v": 0
    },
    {
        "_id": "5d5b8a14c5c38f450ca39fb5",
        "judgeName": "saitrinath",
        "source_product_id": "448",
        "target_products": [
            {
                "_id": "5d5b8a14c5c38f450ca39fba",
                "product_id": "60015",
                "score": 3
            },
            {
                "_id": "5d5b8a14c5c38f450ca39fb9",
                "product_id": "973",
                "score": 2
            },
            {
                "_id": "5d5b8a14c5c38f450ca39fb8",
                "product_id": "81851",
                "score": 1
            },
            {
                "_id": "5d5b8a14c5c38f450ca39fb7",
                "product_id": "70898",
                "score": 3
            },
            {
                "_id": "5d5b8a14c5c38f450ca39fb6",
                "product_id": "274",
                "score": 1
            }
        ],
        "time": "2019-08-20T05:50:12.613Z",
        "__v": 0
    }
]

I am getting output like this:

"judgeName","source_product_id","target_products.product_id","target_products.score","time"
,,"9096",1,
,,"48484",2,
,,"9096",1,
,,"48484",2,
,,"60015",3,
,,"973",2,
,,"81851",1,
,,"70898",3,
,,"274",1,

When I use unwind command, other fields(“judgeName”,“source_product_id”, “time”) are getting missing which is not expected.

Just check the issue.

[andy-welo]

For anyone else having this kind of problem, it has something to do with mongoose documents. I found a way to fix this by using toObject() at every item. So for your example i guess it’d be fixed by changing:

const csvJudges = json2csvParser.parse(judges); to const csvJudges = json2csvParser.parse(judges.map(judge => judge.toObject()));

Hope this helps

[OnkarMadli]

For anyone else having this kind of problem, it has something to do with mongoose documents. I found a way to fix this by using toObject() at every item. So for your example i guess it’d be fixed by changing:

const csvJudges = json2csvParser.parse(judges); to const csvJudges = json2csvParser.parse(judges.map(judge => judge.toObject()));

Hope this helps

I had the same problem since I was directly using the data returned by a mongoose query. This solution worked!!!