Prevent record update

This example shows you how to prevent updating records based on specific criteria.
Here, shipped orders should not be editable. We will notify the user with a customized error message.
Requirements
An admin backend running on forest-express-sequelize
How it works
Directory: /models
This directory contains the orders.js file where the model is declared.
/models/order.js
module.exports = (sequelize, DataTypes) => {
  const { Sequelize } = sequelize;
  const Orders = sequelize.define('orders', {
    shippingStatus: {
      type: DataTypes.STRING,
    },
    ...
  }, {
    tableName: 'orders',
    underscored: true,
    schema: process.env.DATABASE_SCHEMA,
  });
​
  Orders.associate = (models) => {
    ...
  };
​
  return Orders;
};
​
Directory: /routes
This directory contains the orders.js file where the routes are declared.
We override the update route so it sends an error as a response when the shippingStatus is either Shipped or In transit. Otherwise, it triggers the default logic with next().
/routes/orders.js
const express = require('express');
const { PermissionMiddlewareCreator, RecordsGetter } = require('forest-express-sequelize');
const { orders } = require('../models');
​
const router = express.Router();
const permissionMiddlewareCreator = new PermissionMiddlewareCreator('orders');
​
...
​
// Update a Order
router.put('/orders/:recordId', permissionMiddlewareCreator.update(), (request, response, next) => {
  return new RecordGetter(orders).get(request.params.recordId)
    .then((order) => {
      if (order.shippingStatus === 'Shipped' || order.shippingStatus === 'In transit') {
        response.status(403).send('Sorry, an order cannot be modified once shipped!');
      } else {
        next();
      }
    });
});
​
...
​
module.exports = router;
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