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Comments (2)

vkarpov15 avatar vkarpov15 commented on September 22, 2024 1

This is expected behavior, but something we need to make more clear in the docs.

Unfortunately MongoDB's replaceOne() means replace the whole document except _id, and there's no way to preserve createdAt when updating.

For preserving createdAt with replaceOne(), your best bet is to use the "pull the timestamp from the _id" trick:

schema.virtual('createdAt').get(function() {
  return this._id.getTimestamp();
});

This approach works presuming you always use the default _id

from mongoose.

IslandRhythms avatar IslandRhythms commented on September 22, 2024
const mongoose = require('mongoose');

const { Schema } = mongoose;

const productSchema = new Schema({
  name: {
    type: String,
    required: true,
  },
  price: {
    type: Number,
    required: true,
    min: 0,
  },
}, {
  timestamps: true
});

const ProductModel = mongoose.model('Product', productSchema);

async function run() {
  await mongoose.connect('mongodb://localhost:27017');
  await mongoose.connection.dropDatabase();

  const createdProduct = await ProductModel.create({ name: 'Product', price: 18 });
  console.log('what is createdProduct', createdProduct);

  const res = await ProductModel.replaceOne({ _id: createdProduct.id}, { name: 'Changed Product' });
  console.log('what is res', res);
  console.log(await ProductModel.findOne());
}

run();

from mongoose.

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