Convert ObjectID to String in Springboot mongo Aggregation

Question

I have a query:

db.results.aggregate([{
        $project: {
            "_id": {
                $toString: "$_id"
            }
        }
    }
]);

I need to convert this into java springboot aggregation. I'm confused with $toString in java.

Any idea?

please paste your aggregation code. Also, ObjectId.toString() ? — pandaadb
– pandaadb, Commented Jan 29, 2020 at 11:31

Brian Tompsett - 汤莱恩 · Accepted Answer · 2020-07-01 17:02:31Z

2

In Spring aggregation you need to use like below which give a String value of ObjectId:

ProjectionOperation projectOp = Aggregation.project().andArrayOf(new Document("$toString","$_id")).as("id");

5,92772 gold badges63 silver badges135 bronze badges

answered Jul 1, 2020 at 16:33

Ajeeth

465 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1