sequelize; use of loosely coupled tables

gistfile1.js

var Sequelize = require("sequelize")
  , sequelize = new Sequelize('database', 'root')

var MainClient = sequelize.define('main_client', {
  name: Sequelize.STRING
}, {
  freezeTableName: true
})

var MainDashboard = sequelize.define('main_dashboard', {
  title: Sequelize.STRING
}, {
  freezeTableName: true
})

MainClient.hasOne(MainDashboard, { foreignKey: 'idClient' })
MainDashboard.hasOne(MainClient, { foreignKey: 'clientId' })

sequelize.sync({ force: true }).success(function() {
  MainClient.create({ name: 'john doe' }).success(function(client) {
    MainDashboard.create({ title: 'noot, a nice dashboard' }).success(function(dashboard) {
      client.setMainDashboard(dashboard).success(function() {
        dashboard.setMainClient(client).success(function() {
          client.getMainDashboard().success(function(d) {
            console.log('the dashboard', d.values)
            dashboard.getMainClient().success(function(c) {
              console.log('the client', c.values)
              console.log('done')
            })
          })
        })
      })
    })
  })
})