How to cache queries in Rails across multiple requests?

You can cache the query results using ActiveSupport's cache store which can by backed by a memory store such as memcached, or a database store if you provide your own implementation. Note that you'll want to use a database store if the cache is shared across multiple Ruby processes which will be the case if you're deploying to Mongrel Cluster or Phusion Passenger This Railscast has the details.

You can cache the query results using ActiveSupport's cache store, which can by backed by a memory store such as memcached, or a database store if you provide your own implementation. Note that you'll want to use a database store if the cache is shared across multiple Ruby processes which will be the case if you're deploying to Mongrel Cluster or Phusion Passenger. This Railscast has the details.

You also could check for your action cache before querying the database in the controller.

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