def cache(key, options = {}, &block) # :doc:
        if cache_configured?
          cache_store.fetch(ActiveSupport::Cache.expand_cache_key(key, :controller), options, &block)
        else
          yield
        end
      end
def cache(key, options = {}, &block) # :doc:
        if cache_configured?
          cache_store.fetch(ActiveSupport::Cache.expand_cache_key(key, :controller), options, &block)
        else
          yield
        end
      end
Convenience accessor.