Mongoose

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. ...

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 ...