[SuperZen]

Пример получился такой:

index.js

var Sequelize = require('sequelize')

var sequelize = new Sequelize('product', null, null, {
  dialect: "sqlite",
  storage: './product.sqlite',
})

var Product = sequelize.define('Product', {
  owner_id: Sequelize.STRING,
  name: Sequelize.STRING,
  price: Sequelize.INTEGER
})

sequelize
  .sync({ force: true })
  .then(function (err) {
    const owner_id = 1
    Product.bulkCreate([
      {
        owner_id: 1,
        name: 'one',
        price: 100
      },
      {
        owner_id: 1,
        name: 'one',
        price: 200
      }
    ]).then(() => {
      return Product.update({ price: 300 }, { where: { owner_id: 1 } })
      // хз тут возможно нужно делать транзакцию, если идти этим путем
      // Product.findAll({ where: owner_id }).then(products => {
      //   products.forEach(product => {
      //     product.price = 300
      //     product.save()
      //   })
      // })
    }).spread((affectedCount, affectedRows) => {
      return Product.findAll()
    }).then(products => {
      console.log(products)
    })
  }, function (err) {
    console.log('An error occurred while creating the table:', err)
  })

package.json

{
  "name": "sequelize_findAll_update",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "sequelize": "^4.41.2",
    "sqlite3": "^4.0.4"
  }
}