Question 1

Which command creates a new Rails application in API-only mode?

Accepted Answer

The --api flag when creating a Rails application generates a lightweight application optimized for APIs. This configuration excludes view-related middlewares (cookies, sessions, flash), doesn't include Action View and Action Cable by default, and configures ApplicationController to inherit from ActionController::API rather than ActionController::Base. This reduces application size and improves performance for pure API use cases.

Question 2

From which class does ApplicationController inherit in a Rails API-only application?

Accepted Answer

In a Rails API-only application, ApplicationController inherits from ActionController::API instead of ActionController::Base. This class is a lightweight version that doesn't include modules related to HTML rendering, sessions, cookies, and flash messages. It only retains essential functionality for an API like routing, parameters, JSON rendering, and callbacks. This enables more performant controllers for REST APIs.

Question 3

Which method should be used to render a JSON response in a Rails controller?

Accepted Answer

The render method with the json: option is the standard way to return JSON in Rails. It automatically converts the passed object to JSON via the to_json method. You can customize the HTTP status code with the status: option, exclude attributes, or use serializers for finer control. This approach is simple and sufficient for most basic use cases.

Rails API Mode

Which command creates a new Rails application in API-only mode?

Câu trả lời

From which class does ApplicationController inherit in a Rails API-only application?

Câu trả lời

Which method should be used to render a JSON response in a Rails controller?

Câu trả lời

Which gem is recommended for handling CORS (Cross-Origin Resource Sharing) in a Rails API?

What is the role of a serializer in a Rails API?

Các chủ đề phỏng vấn Ruby on Rails khác

Ruby Basics

Ruby Object-Oriented Programming

Rails Fundamentals

Routing & Controllers

ActiveRecord Basics

Views & ERB Templates

ActiveRecord Associations

Advanced ActiveRecord Queries

Rails Forms

Authentication & Authorization

Modern Asset Pipeline & Frontend

Testing with RSpec

ActiveJob & Background Jobs

ActionCable & WebSockets

ActionMailer

ActiveStorage

Caching Strategies

Advanced Migrations

Rails Engines & Modular Apps

Performance Optimization

Rails Design Patterns

Ruby Metaprogramming

Rails Security

GraphQL with Rails

Deployment & Production

Monitoring & Logging

Rails Upgrade Strategies

Nắm vững Ruby on Rails cho lần phỏng vấn tiếp theo