插入默认值不起作用mongodb

本文介绍了插入默认值不起作用mongodb的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用猫鼬版本5.2.5，这是我的订单的示例模型

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' });

我在猫鼬save和findOneAndUpdate的主脚本中使用以上模型. 在生产系统中，我们看到许多文档在保存文档中没有last_updated键.

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.

以下是我们的主脚本中猫鼬save方法和findOneAndUpdate的示例代码.我们看到有些文档具有updated_at键，而保存文档时很少有它们.

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 });

任何人都可以分享为什么没有updated_at就能保存很少的文档吗?

Can any one share why we have few documents are getting saved without updated_at?

推荐答案

您需要使用选项update操作期间进行nofollow noreferrer> setDefaultsOnInsert: true .

You need to use option setDefaultsOnInsert: true during the update operation.

文档

默认情况下，猫鼬仅在创建新的时应用默认设置 文档.如果您使用update()和 findOneAndUpdate().但是，猫鼬4.x可让您选择加入 使用setDefaultsOnInsert选项的行为.

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 } )