make rails model act as ActiveRecord, but not save data into database but cache system, file or redis

This gem enables automatic failover to a secondary caching method when the primary fails.

Provide a simple interface to redis with self-expiring keys.

Extremely simple Redis caching for any Ruby class

Transparently cache the results of methods using redis.

Redis adapter for Cache Machine gem.

Fast, light-weight, session-based, redis-backed Rails caching.

Dedicated classes to isolate redis logic in rails.

A gem for cache facility

CacheStache tracks cache hit/miss rates and exposes a small Rails engine UI.

This is the redis cache_store implementation.

Serve stale cached values while recomputing in the background to reduce tail latency.

Don't calculate the cached value twice at the same time. Use a backup of the data if the service is down.

Tag your cache keys smartly, you can expire by tags, count keys per tag and many more. based on Redis

Write-through ActiveRecord model caching that's right on the money

Another Background gem

Users can browse locations by country, city, and state and search locations by string or zip code. Administrators can manage locations and the services they offer.

Invisible image based tracing service with Redis backend

Simple feature flags based on a redis instance, a YAML config file and/or environment variables.

A Canonical URL cache using Redis