saves query result to directory

def save(self, cachedir=None, cfgstr=None, verbose=VERBOSE, quiet=QUIET,
             ignore_keys=None):
        """
        saves query result to directory
        """
        fpath = self.get_fpath(cachedir, cfgstr=cfgstr)
        if verbose:
            print('[Cachable] cache save: %r' % (basename(fpath),))

        if hasattr(self, '__getstate__'):
            statedict = self.__getstate__()
        else:
            statedict = self.__dict__

        if ignore_keys is None:
            save_dict = statedict
        else:
            save_dict = {key: val
                         for (key, val) in six.iteritems(statedict)
                         if key not in ignore_keys}

        util_io.save_data(fpath, save_dict)
        return fpath