# 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.

![](http://g.recordit.co/3PB5z1WoeQ.gif)

## 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.

{% code title="/models/order.js" %}

```javascript
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;
};

```

{% endcode %}

### 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()`.

{% code title="/routes/orders.js" %}

```javascript
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, request.user, request.query).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;
```

{% endcode %}


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