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

```ruby
validates :total, numericality: { greater_than_or_equal_to: 0 }
```

```ruby
validates :total, numericality: true
```

```ruby
validates :total, length: { minimum: 0 }
```

How can we ensure that an Active Record field is greater than `0`?

How can we ensure that an Active Record field is greater than <code>0</code>?

This helps Active Record to determine the `Product#placements` relation.

This is needed for Active Record to determine association.

Why do we put the `inverse_of` option in the `Placement` model for `belongs_to :products` call?

Why do we put the <code>inverse_of</code> option in the <code>Placement</code> model for <code>belongs_to :products</code> call?

```text
params.require(:order).permit(product_ids: [])
```

```text
params.require(:order).permit(:product_ids)
```

How do we allow multiple HTTP parameters for `order[product_ids]`?

How do we allow multiple HTTP parameters for <code>order[product_ids]</code>?

What is the best Active Record callback to compute the order’s total?

What is the best Active Record callback to compute the order’s total?

Try to answer these questions to make sure that you understood this chapter.

Getting Started

The API

User Model

Authenticating the Users

User's Products

Building JSON

Placing Orders

Improving Orders

Optimizations

Wrap up

Appendix

Quiz Yourself: Order and Placement Model