Initializes Api(Client|Hunt|CronJob)Approval from the database object.

def _InitApiApprovalFromDatabaseObject(api_approval, db_obj):
  """Initializes Api(Client|Hunt|CronJob)Approval from the database object."""

  api_approval.id = db_obj.approval_id
  api_approval.requestor = db_obj.requestor_username
  api_approval.reason = db_obj.reason

  api_approval.notified_users = sorted(db_obj.notified_users)
  api_approval.email_cc_addresses = sorted(db_obj.email_cc_addresses)
  api_approval.email_message_id = db_obj.email_message_id

  api_approval.approvers = sorted([g.grantor_username for g in db_obj.grants])

  try:
    approval_checks.CheckApprovalRequest(db_obj)
    api_approval.is_valid = True
  except access_control.UnauthorizedAccess as e:
    api_approval.is_valid_message = utils.SmartStr(e)
    api_approval.is_valid = False

  return api_approval