file_path_key

# File activesupport/lib/active_support/cache/file_store.rb, line 178
        def file_path_key(path)
          fname = path[cache_path.to_s.size..-1].split(File::SEPARATOR, 4).last.delete(File::SEPARATOR)
          URI.decode_www_form_component(fname, Encoding::UTF_8)
        end