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

# Default migration file
The default migration file generated by `rails generate` should look like this: 

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


React

Dart

GoJS React

Typescript React

Vue.js

We don't need any changes in the default migration file since it fulfills our requirements.
# Build changes
We now have to update `schema.rb` by initiating migration with this command: 
```shell
$ rake db:migrate 
```
Click the "Run" button, and a terminal will appear. Execute this command to build changes.

Now, run the `rake test` command. You’ll notice that a test fails at this point.

```text
$ rake test
....E
Error:
Api::V1::UsersControllerTest#test_should_destroy_user: 
ActiveRecord::InvalidForeignKey: SQLite3::ConstraintException: 
FOREIGN KEY constraint failed
rails test test/controllers/api/v1/users_controller_test.rb:43
```
What happened? We didn’t touch the users!

Often when developers work with associations, they forget to destroy dependencies between models. Ideally, a user’s products should be deleted along with the user. Suppose we need a user with one of the products to test the interaction between the models. If we delete the user, we’ll hope that the products are deleted with them. Rails has already generated this for us in `test/fixtures/products.yml`. We will see it in detail later in [this](https://www.educative.io/courses/building-api-rails/unit-tests-3wA3YYKW2nR) chapter.

Let's run the migrations to generate the database for products.

Migration File

Getting Started

The API

User Model

Authenticating the Users

User's Products

Building JSON

Placing Orders

Improving Orders

Optimizations

Wrap up

Appendix

Migration File

Default migration file