docs: def get_assignable_objective_bank_ids(self, objective_bank_id):
          """Gets a list of objective banks including and under the given objective bank node in which any objective can be assigned.
  
          arg:    objective_bank_id (osid.id.Id): the ``Id`` of the
                  ``ObjectiveBank``
          return: (osid.id.IdList) - list of assignable objective bank
                  ``Ids``
          raise:  NullArgument - ``objective_bank_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.ResourceBinAssignmentSession.get_assignable_bin_ids
          # This will likely be overridden by an authorization adapter
          mgr = self._get_provider_manager('LEARNING', local=True)
          lookup_session = mgr.get_objective_bank_lookup_session(proxy=self._proxy)
          objective_banks = lookup_session.get_objective_banks()
          id_list = []
          for objective_bank in objective_banks:
              id_list.append(objective_bank.get_id())
          return IdList(id_list)