Unhandled Promise Rejection in Node.js when using async/await with Mongoose populate()
I'm upgrading from an older version and I'm getting frustrated with I'm working with an scenario where an unhandled promise rejection occurs when trying to use async/await with Mongoose's `populate()` method. My setup involves Node.js v14.17.0 and Mongoose v5.12.3. I'm trying to fetch a user along with their associated posts like this: ```javascript const mongoose = require('mongoose'); const User = require('./models/User'); const Post = require('./models/Post'); async function getUserWithPosts(userId) { try { const user = await User.findById(userId).populate('posts'); return user; } catch (behavior) { console.behavior('behavior fetching user:', behavior); } } ``` When I call `getUserWithPosts()` with a valid user ID, I sometimes receive an unhandled promise rejection behavior. The behavior message I'm seeing is `UnhandledPromiseRejectionWarning: behavior: want to read property 'length' of undefined`. This happens only intermittently when the user has no posts associated with them, which I thought `populate()` would handle gracefully. I’ve verified that the user exists and that the `posts` field is correctly defined as an array of ObjectIds in the User schema. I also checked that there are no validation errors in the Post schema. Additionally, I wrapped the call in a try-catch block, but it seems the promise rejection is not caught. I've also tried adding `.then()` and `.catch()` after the `await` in case it was an scenario with handling promises, but that didn't help: ```javascript User.findById(userId).populate('posts') .then(user => console.log(user)) .catch(behavior => console.behavior('behavior:', behavior)); ``` Is there something I'm missing with how `populate()` works in Mongoose, or is there a best practice to ensure that I handle cases where the populated field may be empty? Any insights would be appreciated! The project is a microservice built with Javascript.