caching-strategies

name	caching-strategies
description	Implements Rails caching patterns for performance optimization. Use when adding fragment caching, Russian doll caching, low-level caching, cache invalidation, or when user mentions caching, performance, cache keys, or memoization. WHEN NOT: General query optimization (use performance-optimization), background job processing, or problems caused by N+1 queries rather than missing caches.
paths	app/views/**/*.erb, app/controllers/**/*.rb

Caching Strategies for Rails 8

Overview

Rails provides multiple caching layers:

• Fragment caching: Cache view partials
• Russian doll caching: Nested cache fragments
• Low-level caching: Cache arbitrary data
• HTTP caching: Browser and CDN caching
• Query caching: Automatic within requests

Quick Start

# config/environments/development.rb
config.action_controller.perform_caching = true
config.cache_store = :memory_store

# config/environments/production.rb
config.cache_store = :solid_cache_store  # Rails 8 default
# OR
config.cache_store = :redis_cache_store, { url: ENV["REDIS_URL"] }

Enable caching in development: