Sequelize insert demo

index.js

const Sequelize = require('sequelize')

const sequelize = new Sequelize({
  dialect: 'sqlite',
  storage: 'db.sqlite3'
})

const Product = sequelize.define('product', {
  name: Sequelize.STRING
})

const OrderItem = sequelize.define('order_item', {
  quantity: Sequelize.INTEGER
})
OrderItem.Product = OrderItem.belongsTo(Product)

const Address = sequelize.define('address', {
  city: Sequelize.STRING,
})

const Order = sequelize.define('order', {
})
Order.OrderItem = Order.hasMany(OrderItem)
Order.hasOne(Address)
Order.Product = Order.belongsToMany(Product, { through: OrderItem })
Product.Order = Product.belongsToMany(Order, { through: OrderItem })


const main = async () => {
  await sequelize.authenticate()
  await sequelize.sync({ force: true })

  await Product.create({
    name: 'Product 1'
  })


  // Your case
  const product = await Product.findByPk(1)

  const order = await Order.create({
    order_items: [{
      productId: product.id,
      quantity: 2,
    }],
    address: {
      city: 'Ha Noi'
    }
  }, {
    include: [OrderItem, Address]
  })

  // The case you asked
  const order2 = await Order.create({
    order_items: [{
      product: {
        name: 'Product 2'
      },
      quantity: 2,
    }],
    address: {
      city: 'Ha Noi'
    }
  }, {
    include: [{
      association: Order.OrderItem,
      include: [OrderItem.Product]
    }, Address]
  })

  // BelongsToMany
  const order3 = await Order.create({
    products: [{
      name: 'Product 2'
    }],
    address: {
      city: 'Ha Noi'
    }
  }, {
    include: [Product, Address]
  })
}

main()