mongoose.lean()

    const normalDoc = await MyModel.find();

    const leanDoc = await MyModel.find().lean();

참고)

• https://mongoosejs.com/docs/tutorials/lean.html
• https://node-js.tistory.com/26
• https://choonse.com/2022/02/23/1000/
• https://stackoverflow.com/questions/31106869/mongoose-find-result-and-then-replace-field-with-findone
• https://stackoverflow.com/questions/14504385/why-cant-you-modify-the-data-returned-by-a-mongoose-query-ex-findbyid