Delve into creating, optimizing, and securing a Rails API from scratch. Gain insights into building a full-fledged, efficient Rails API, ready for immediate use.

rails.tar.gz

Routes changes

validating_the_user_model

unit_tests

show_user

migration_file

create_tokens

feed_the_database

presentation_of_JSON_API

validating_the_order_model

list_orders

decrementing_product_quantity

extending_the_placement_model

feed_the_database-2

feed_the_database-3

Setting Up the Authentication Token

validating_the_product_model

unit_tests_for_order_model

the_placement_model

decrementing_product_quantity-2

activation_of_CORS

This course is a comprehensive tutorial that will teach you the best way to build your next API with Rails. You’ll learn to create a Rails API from scratch and to optimize and secure a Rails API. By the end of this course, you’ll have a full-fledged Rails API ready to be used.

Building your own API with Rails

At the start of this chapter, we added the attribute `quantity` to the `Product` model. It is now time to validate that the quantity of product is sufficient for the order to be placed. To make things more interesting, we will do this using a custom validator.

First, we need to add a `validators` directory under the `app` directory (Rails will pick it up, so we don’t need to load it). Use these commands to create the `enough_products_validators.rb` file in the `app/validators` directory using the terminal below:
```
$ mkdir app/validators
$ touch app/validators/enough_products_validator.rb
```

Learn how we can validate that the number of products ordered does not exceed the number of available products.

Validate Quantity of Products

Getting Started

The API

User Model

Authenticating the Users

User's Products

Building JSON

Placing Orders

Improving Orders

Optimizations

Wrap up

Appendix

Validate Quantity of Products