caching

Russian doll caching in Rails nests fragment caches so parent caches are efficiently invalidated when related child model changes occur. It uses touch callbacks and model dependencies to automatically expire only the specific nested fragments that change.

Low-level caching in Rails uses Rails.cache.fetch to store results of expensive service objects or queries. It requires defining controlled cache invalidation through time-based expiration or explicit model triggers to ensure stored data remains fresh.

Fragment caching in Rails 8 requires configuring a cache store like memory_store or redis and enabling caching in the development environment. This setup validates the caching workflow before storing rendered partials to minimize re-rendering costs.

HTTP caching optimizes Rails API responses by setting headers that allow clients to store responses locally. This reduces redundant server requests and improves client-side performance by validating cached data freshness without re-fetching entire payloads.

Cache invalidation via touch callbacks should be used when parent models need to reflect child object updates in Russian doll caching. It automatically updates the parent timestamp, expiring dependent fragments without manual cache clearing logic.