Insert default values not working mongodb - mongodb

Question

I am using mongoose version 5.2.5 and here is the sample model of my order
....
let PlaceOrderSchema = new mongoose.Schema({
any: {}
}, { strict: false },
{ timestamps: { updatedAt: 'last_updated', createdAt: 'created' });
I am using the above model in main script with mongoose save and findOneAndUpdate.
In our production system , we are seeing many document that does not have last_updated key missing in the save document.
Here are sample code of the mongoose save method and findOneAndUpdate in our main script.We are seeing some of the documents have updated_at keys while very few of them does not have it while saving the document
let orderModel = require('./orderModel');
let newOrder = {
order_no: 1234
};
//save usage code
(new Order(newOrder).save({lean: true}, ()=> {
//do...something
}));
//findOneAndUpdate usage Code
let orderNo = 123
OrderModel.findOneAndUpdate({ order_no: orderNo },
{
$set: { items: [{product_id: 'abc', quantity: 1}] },
},
{ new: true, upsert: true },
(err, res) => {
//do_something
});
Can any one share why we have few documents are getting saved without updated_at?

Answer 1

You need to use option setDefaultsOnInsert: true during the update operation.
Docs
By default, mongoose only applies defaults when you create a new
document. It will not set defaults if you use update() and
findOneAndUpdate(). However, mongoose 4.x lets you opt-in to this
behavior using the setDefaultsOnInsert option.
OrderModel.findOneAndUpdate(
{ order_no: orderNo },
{ $set: { items: [{ product_id: "abc", quantity: 1 }] }},
{ new: true, upsert: true, setDefaultsOnInsert: true }
)