caching-strategies

HTTP caching with ETags uses the fresh_when method to serve 304 Not Modified responses when content remains unchanged. This Rails strategy avoids recomputing unchanged data on every request, dramatically reducing database load and latency for API endpoints and report pages.

Russian doll caching is a fragment caching strategy that nests cached view fragments to cascade invalidations efficiently. Use it in Rails apps to avoid re-rendering complex views, where parent caches invalidate automatically when child fragments change.

Low-level caching in Rails stores expensive query results using coherent cache keys and invalidation rules. Configure your cache store and apply low-level caching to data-heavy operations and collection caching to reuse computed results across multiple requests.

Yes, the caching strategies support Solid Cache integration and are designed for standard Rails 8 workloads. They satisfy requirements for cache stores, invalidation patterns, and coherent cache-key strategies across fragment, HTTP, and low-level caching layers.

The best way to invalidate Rails fragment caches is using coherent cache-key strategies that trigger cascade invalidations. Russian doll caching handles this by nesting fragments, ensuring parent caches invalidate automatically when underlying child data changes.

Avoid fragment caching when rendering highly dynamic content that changes per request, as cache misses add overhead. Fragment caching works best for dashboards, report pages, and API endpoints rendering the same data across many requests.