'Copy a multi to a user account.'

def _copy_multi(self, from_multi, to_path_info, rename=False):

    to_owner = self._check_new_multi_path(to_path_info)
    if (rename and (from_multi.owner != to_owner)):
        raise RedditError('MULTI_CANNOT_EDIT', code=400)
    try:
        LabeledMulti._byID(to_path_info['path'])
    except tdb_cassandra.NotFound:
        to_multi = LabeledMulti.copy(to_path_info['path'], from_multi, owner=to_owner)
    else:
        raise RedditError('MULTI_EXISTS', code=409, fields='multipath')
    return to_multi
