Question 1

Which Rails helper is used to cache a view fragment?

Accepted Answer

The cache helper is used to cache a view fragment by wrapping content in a block. Rails automatically generates a cache key based on the block content and arguments passed. This avoids re-generating the HTML on each request if the content hasn't changed.

Question 2

How does Rails automatically invalidate a fragment's cache when an ActiveRecord model is passed to the cache helper?

Accepted Answer

Rails uses the model's cache_key_with_version method which includes the id and updated_at. When the model is modified, updated_at changes automatically, generating a new cache key and invalidating the old entry without manual intervention.

Question 3

What is Russian doll caching in Rails?

Accepted Answer

Russian doll caching involves nesting cache fragments inside each other, like Russian nesting dolls. For example, a collection cache contains caches for individual items. When an item changes, only its cache is invalidated, while other items remain cached.

Caching Strategies

Which Rails helper is used to cache a view fragment?

Câu trả lời

How does Rails automatically invalidate a fragment's cache when an ActiveRecord model is passed to the cache helper?

Câu trả lời

What is Russian doll caching in Rails?

Câu trả lời

Which method should be used to cache an expensive computed value outside of views?

Which cache store is recommended for a production Rails application with multiple servers?

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

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