repository.ts

import {Product, IProduct} from './product'
import {Order, IOrder} from './order'

const main = async () => {
  // products to insert
  const productsPayload: IProduct[] = [{name: 'Pokemon', price: 20, stock: 40}, {name: 'Socks', price: 10, stock: 50}]
  // Inserted products result typed with the interface IProduct
  const products: IProduct[] = await Product.insertMany(productsPayload)
  
  // Order to insert
  const orderPayload: IOrder = {
    // Relation
    productsIds: products.map(p => p._id),
    quantity: 2,
  }
  // Create the order and then populate products, you can not use populate directly on the create function 
  const order: IOrder = await Order.create(orderPayload).then(order => order.populate('products'))
}