Mongodb update all the documents with unique id

Question

I have collection with name products with almost 100k documents. I want to introduce a new key called secondaryKey with unique value uuid in all the documents. I do this using nodejs.

Problem I am facing:-

When I try the below query,

db.collection('products').updateMany({},{"$set":{secondaryKey: uuid()}});

Here it updates all the documents with same uuid value,

I try with loop to update document one by one,but here issues is I don't have filter value in updateOne because I want to update all the documents.

Can anyone please help me here. Thanks :)

Answer 1

If you are using MongoDB version >= 4.4 You can try this:

db.products.updateMany(
    {},
    [
        {
            $set: {
                secondaryKey: {
                    $function: {
                        body: function() {
                            return UUID().toString().split('"')[1];
                        },
                        args: [],
                        lang: "js"
                    }
                }
            }
        }
    ]
);

Output

[
  {
    "_id": ObjectId("..."),
    "secondaryKey": "f41b15b7-a0c5-43ed-9d15-69dbafc0ed29"
  },
  {
    "_id": ObjectId("..."),
    "secondaryKey": "50ae7248-a92e-4b10-be7d-126b8083ff64"
  },
  {
    "_id": ObjectId("..."),
    "secondaryKey": "fa778a1a-371b-422a-b73f-8bcff865ad8e"
  }
]