How to Update Nested Array Subdocuments Using Main Document Field with Mongoose

Fri, 05 Jul 2024 00:00:00 +0000

Updating nested array subdocuments based on a field in the main document is a common task when working with MongoDB and Mongoose. Here’s a simple guide and example to help you accomplish this.

Plan

Use Model.updateMany() or Model.findOneAndUpdate() to update multiple or a single document.
Use an aggregation pipeline ([{}]) as the second argument to reference document fields.
Use the $set stage within the pipeline to update the nested array.
Use the $$ROOT variable to reference fields from the main document.

Example

Assume you have a User model where each user has an array of posts, and you want to set each post’s authorName field based on the user’s name field.

How to update a specified item in a nested array with Mongoose

Sat, 11 Feb 2023 00:00:00 +0000

In this blog post, we’ll go over how to update a specified item in a nested array inside a Mongoose document.

##Setting up the environment

First, let’s set up the environment by creating a Mongoose schema and model. Here’s an example schema that has a nested array of items:

const mongoose = require('mongoose');

const schema = new mongoose.Schema({
  items: [{
    name: String,
    quantity: Number
  }]
});

const Model = mongoose.model('Model', schema);

##Updating a specified item in a nested array

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How to Update Nested Array Subdocuments Using Main Document Field with Mongoose

Plan

Example

How to update a specified item in a nested array with Mongoose