API-only application setup in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Rails API-only application.

Ruby on Rails

rails new my_api_app --[1]

Drag options to blanks, or click blank then click option'

Aminimal

Bapi

Cfull

Dweb

Attempts:

3 left

💡 Hint

Common Mistakes

Using --full creates a full Rails app with views and assets.

Using --minimal is not a valid Rails new flag.

Using --web is not a recognized option.

Using --api creates a Rails application optimized for API-only use.

2fill in blank

medium

Complete the code to generate a controller in an API-only Rails app.

Ruby on Rails

rails generate controller [1] --no-helper --no-assets

Drag options to blanks, or click blank then click option'

AHome

BAssets

CViews

DLayouts

Attempts:

3 left

💡 Hint

Common Mistakes

Generating controllers named 'Views' or 'Assets' which are not controllers.

Forgetting to skip helpers and assets in API apps.

Controllers in API apps handle JSON requests; helpers and assets are usually not needed.

3fill in blank

hard

Fix the error in the config to enable CORS in an API-only Rails app.

Ruby on Rails

Rails.application.config.middleware.insert_before 0, Rack::Cors do
  allow do
    origins '[1]'
    resource '*', headers: :any, methods: [:get, :post, :options]
  end
end

Drag options to blanks, or click blank then click option'

Anil

Blocalhost

Cexample.com

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'nil' causes errors.

Using 'localhost' restricts access to local only.

Using a domain without quotes causes syntax errors.

Using '*' allows all origins to access the API, which is common in development.

4fill in blank

hard

Fill both blanks to configure the API-only app to skip session and cookies middleware.

Ruby on Rails

config.api_only = true
config.middleware.delete [1]
config.middleware.delete [2]

Drag options to blanks, or click blank then click option'

AActionDispatch::Session::CookieStore

BActionDispatch::Cookies

CRack::Runtime

DActionDispatch::Flash

Attempts:

3 left

💡 Hint

Common Mistakes

Deleting unrelated middleware like Rack::Runtime.

Forgetting to delete cookies middleware.

API-only apps usually remove session and cookies middleware to keep the app lightweight.

5fill in blank

hard

Fill all three blanks to create a JSON response in a Rails API controller action.

Ruby on Rails

def index
  @items = Item.all
  render json: [1], status: [2], [3]: 'items'
end

Drag options to blanks, or click blank then click option'

A@items

B:ok

Croot

Ditems

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a variable for JSON data.

Using wrong status symbols.

Misnaming the root key option.

This renders the @items collection as JSON with HTTP status 200 and sets the root key to 'items'.