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
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module.exports = (sequelize, DataTypes) => {
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  const { Sequelize } = sequelize;
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  const Orders = sequelize.define('orders', {
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    shippingStatus: {
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      type: DataTypes.STRING,
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    },
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    ...
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  }, {
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    tableName: 'orders',
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    underscored: true,
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    schema: process.env.DATABASE_SCHEMA,
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  });
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​
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  Orders.associate = (models) => {
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    ...
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  };
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​
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  return Orders;
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};
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​
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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
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const express = require('express');
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const { PermissionMiddlewareCreator, RecordsGetter } = require('forest-express-sequelize');
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const { orders } = require('../models');
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​
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const router = express.Router();
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const permissionMiddlewareCreator = new PermissionMiddlewareCreator('orders');
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​
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...
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​
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// Update a Order
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router.put('/orders/:recordId', permissionMiddlewareCreator.update(), (request, response, next) => {
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  return new RecordGetter(orders, request.user, request.query).get(request.params.recordId)
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    .then((order) => {
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      if (order.shippingStatus === 'Shipped' || order.shippingStatus === 'In transit') {
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        response.status(403).send('Sorry, an order cannot be modified once shipped!');
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      } else {
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        next();
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      }
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    });
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});
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​
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...
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​
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module.exports = router;
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