What is the best way to store data about objects from another mongodb collection?

Question

MongoDB

There are two collections. In one product and its description, and in another collection, the buyer. I store the basket as an array in the customer. I don't know how better. In the basket to store links (objectid) to goods from the collection of goods or to create the objects themselves in the basket?

Answer 1

I think it's better to store links to products, and not copy products - otherwise you can not keep track of information changes, and the user will display outdated information, well, in general,
if this is going to node / mongoose, then I would start with the fact that in the user model made

cart: [{ 
  type: mongoose.Schema.Types.ObjectId, 
  ref: 'Item' 
  // массив айдишников айтемов из коллекции items
}]

and upon request would populate this array cart

User.findOne({ _id: '......user id ......' }).populate('cart')

https://mongoosejs.com/docs/populate.html
further - by circumstances ¯\_(ツ)_/¯