Make a field readOnly with Sequelize

Sequelize does not allow by itself to define a field as readOnly. But you can do so by using on of Sequelize's addons named sequelize-noupdate-attributes.
the LastName field is readOnly in Sequelize but not the email field
Requirements
An admin backend running on forest-express-sequelize
​sequelize-noupdate-attributes npm package
How it works
Directory: /models
This directory contains the files where your models are defined with Sequelize. To make fields readOnly you need to require the sequelize-noupdate-attributes package and add the noUpdate option to the relevant fields.
The noUpdate option will throw an error if the user tries to update a field that already has a value. However the user will be able to update a field that has a null value.
​
models/users.js
const sequelizeNoUpdateAttributes = require('sequelize-noupdate-attributes');
​
module.exports = (sequelize, DataTypes) => {
  const { Sequelize } = sequelize;
  sequelizeNoUpdateAttributes(sequelize);
  
  const Users = sequelize.define('users', {
    firstName: {
      type: DataTypes.STRING,
      noUpdate: true,
    },
    lastName: {
      type: DataTypes.STRING,
      noUpdate: true,
    },
    email: {
      type: DataTypes.STRING,
    },
  }, {
    tableName: 'users',
    underscored: true,
    timestamps: false,
    schema: process.env.DATABASE_SCHEMA,
  });
​
  return Users;
};
​
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