def filter
      if content = Rails.cache.read(cache_path, :raw => true)
        cache_hit(content)
      else
        cache_miss
      end
    end
def filter
      if content = Rails.cache.read(cache_path, :raw => true)
        cache_hit(content)
      else
        cache_miss
      end
    end
Public
 canonical_path (calc path using current params)