nodejs-express-mongodb | Blog post | Runtime Evironment library

I am trying to display one course and to update course topic, using graphql and apollo-server. This is my code:

I am trying to get course data using graphql, but server is always returning null as a response This is my code in file server.js :

I am trying to update data in my database with Mongoose and NodeJS I can get the data from the loggedin user already but it won't let me update. In my front-end I render a form that get data from the loggedin user (views/pages/profile-edit.ejs).

In the backend user.js file I have this :

I am getting started with mongoDB and I have to say that the official documentation is not that great to see how to implement it with nodejs.

I don't really know how to structure my server file to add mongoClient.connect, should my whole server be written inbeetwen the mongoClient.connect function in order to have access to the db, like in this boilerplate? I am using nodeJS/express.

If you know any good boilerplate, or anything, that could show me the structure of a backend with an implementation of mongoDB, I would really appreciate it. Every time I find something about mongoDB, it is actually about mongooooose!!

I'm building an e-commerce like webapp in Nodejs-Express-MongoDB and what I want to achieve with the following code is to update the available stock of items after user's checkout.

The error comes when i'm trying to update the stock inside the for loop (without it performs as expected).