Question 1

What is a Rails Engine?

Accepted Answer

A Rails Engine is a miniature Rails application that can be mounted within a host application. It allows sharing code (models, controllers, views, routes) between multiple applications or creating isolated and reusable features. Gems like Devise, Sidekiq Web UI and ActiveAdmin are examples of popular engines used in the Rails ecosystem.

Question 2

Which command is used to generate a new mountable Rails Engine?

Accepted Answer

The rails plugin new command with the --mountable option generates a complete engine with its own namespace, isolated routes and folder structure. The --mountable option creates an engine fully isolated from the host application, unlike --full which generates a non-isolated engine sharing the main application's namespace.

Question 3

What is the main difference between a --mountable engine and a --full engine?

Accepted Answer

A --mountable engine is fully isolated with its own namespace (module), its own helpers and routes isolated under a configurable prefix. A --full engine shares the host application's namespace, which can create naming conflicts. The mountable engine's isolation ensures that the engine's classes and routes don't pollute the main application's namespace.

Rails Engines & Modular Apps

What is a Rails Engine?

Câu trả lời

Which command is used to generate a new mountable Rails Engine?

Câu trả lời

What is the main difference between a --mountable engine and a --full engine?

Câu trả lời

How to mount a Rails Engine in the host application's routes.rb file?

What is the purpose of the isolate_namespace directive in a Rails Engine?

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

Rails API Mode

Testing with RSpec

ActiveJob & Background Jobs

ActionCable & WebSockets

ActionMailer

ActiveStorage

Caching Strategies

Advanced Migrations

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