def save(self, doc):
        if doc.id:
            return self.update(doc)
        else:
            return self.insert(doc)
def Exists(self):
    """Returns True if the log group exists."""
    describe_cmd = util.AWS_PREFIX + [
        '--region', self.region,
        'logs', 'describe-log-groups',
        '--log-group-name-prefix', self.name,
        '--no-paginate'
    ]
    stdout, _, _ = vm_util.IssueCommand(describe_cmd)
    log_groups = json.loads(stdout)['logGroups']
    group = next((group for group in log_groups
                  if group['logGroupName'] == self.name), None)
    return bool(group)