I have the following update query, I want to use the value of the _id field. However, I can't, because _id is an ObjectId. and the field that I am writing on requires a string.

How to convert the _id to a string on the fly, within the request, in the concat function?

{ $concat: [`email`, ' #deleted(','$_id', ')'] }

• I am using MongoDB in Mongoose In JavaScript.

full code if required:

await Model.findOneAndUpdate(req.params.id, [
    {
      $set: {
        email: {
          $concat: ['$email', ' #deleted(', '$_id', ')'],
        },
        _archived: Date.now(),
      },
    },
  ])

currently getting:

MongoServerError: Plan executor error during findAndModify :: caused by :: $concat only supports strings, not objectId