def read_cache_results
      @cache_results ||= begin
        mutable_keys = @cache_key_to_engine.keys.map { |k| k.dup }
        if mutable_keys.empty?
          {}
        else
          Rabl.configuration.cache_engine.read_multi(*mutable_keys)
        end
      end
    end
def read_cache_results
      @cache_results ||= begin
        mutable_keys = @cache_key_to_engine.keys.map { |k| k.dup }
        if mutable_keys.empty?
          {}
        else
          Rabl.configuration.cache_engine.read_multi(*mutable_keys)
        end
      end
    end
Returns the items that were found in the cache