def GetFlowResponseSubject(self, session_id, request_id):
    return session_id.Add("state/request:%08X" % request_id)
Looks up ``attr`` as a field of ``model`` and returns the related model class.  If ``attr`` is
dataset/ETHPy150Open google/grr/grr/lib/queue_manager.py/QueueManager.GetFlowResponseSubject--crossover with--dataset/ETHPy150Open pivotal-energy-solutions/django-datatable-view/datatableview/utils.py/get_model_at_related_field