How to prevent duplication in an array?

Question

MongoDB

Is it possible to prevent the same IDs from being added to the array? Added { unique: true, dropDups: true } , but it doesn't help. Perhaps I am passing this option incorrectly.
Tell me, please, what to change?

Project.updateOne(
      { _id: req.params.projectId },
      {
        $push: { developers: req.body.developer.devId },
      },
      { unique: true, dropDups: true }
    );

Answer 1

$addToSet