code: def get_vaults_by_genus_type(self, vault_genus_type):
          
          collection = JSONClientValidated('authorization',
                                           collection='Vault',
                                           runtime=self._runtime)
          result = collection.find({'genusTypeId': {'$in': [str(vault_genus_type)]}}).sort('_id', DESCENDING)
  
          return objects.VaultList(result, runtime=self._runtime)
docs: Gets a ``VaultList`` corresponding to the given vault genus ``Type`` which does not include vaults of types derived from the specified ``Type``.
  
          In plenary mode, the returned list contains all known vaults or
          an error results. Otherwise, the returned list may contain only
          those vaults that are accessible through this session.
  
          arg:    vault_genus_type (osid.type.Type): a vault genus type
          return: (osid.authorization.VaultList) - the returned ``Vault``
                  list
          raise:  NullArgument - ``vault_genus_type`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*