const Sequelize = require('sequelize')
const sequelize = new Sequelize()
const sequelizeJoi = require('sequelize-joi')
sequelizeJoi(sequelize)

const Joi = require('joi')
const CustomJoi = Joi.extend(joi => {})
sequelizeJoi(sequelize, { Joi: CustomJoi })

const SampleModel = sequelize.define('SampleModel', {
  details: {
    type: Sequelize.JSONB,
    allowNull: false,
    schema: Joi.object().keys({
      requiredString: Joi.string().required(),
      optionalString: Joi.string().default(null),
      optionalObject: Joi.object().keys({
        requiredSubNumber: Joi.number().required(),
      }),
    })
  },
})

// Validation passes
await SampleModel
  .build({
    details: {
      requiredString: 'One',
      optionalString: 'Two',
    },
  })
  .validate()
  .then(instance => {
    // instance contains default values appended by Joi
  })

// Validation fails
await SampleModel
  .build({
    details: {
      optionalString: 123,
    },
  })
  .validate()
  .catch(error => {
    // error is a 'SequelizeValidationError'
    // error.errors is an array of 'SequelizeValidationErrorItem'
  })