Caching is a cheap way of speeding up slow applications by keeping the result of calculations, renderings, and database calls around for subsequent requests. Action Controller affords you three approaches in varying levels of granularity: Page, Action, Fragment.

You can read more about each approach and the sweeping assistance by clicking the modules below.

Note: To turn off all caching and sweeping, set

config.action_controller.perform_caching = false.

Caching stores

All the caching stores from ActiveSupport::Cache are available to be used as backends for Action Controller caching. This setting only affects action and fragment caching as page caching is always written to disk.

Configuration examples (MemoryStore is the default):

config.action_controller.cache_store = :memory_store
config.action_controller.cache_store = :file_store, "/path/to/cache/directory"
config.action_controller.cache_store = :mem_cache_store, "localhost"
config.action_controller.cache_store = :mem_cache_store, Memcached::Rails.new("localhost:11211")
config.action_controller.cache_store = MyOwnStore.new("parameter")
Namespace
Methods
C
Included Modules
Instance Public methods
caching_allowed?()

Source: show | on GitHub 

# File actionpack/lib/action_controller/caching.rb, line 69
def caching_allowed?
  request.get? && response.status == 200
end
Instance Protected methods
cache(key, options = {}, &block)

Convenience accessor

Source: show | on GitHub 

# File actionpack/lib/action_controller/caching.rb, line 75
def cache(key, options = {}, &block)
  if cache_configured?
    cache_store.fetch(ActiveSupport::Cache.expand_cache_key(key, :controller), options, &block)
  else
    yield
  end
end