def remove_session(self, session):
    self.session_ids = ','.join([str(id) for id in self.get_session_ids() if (id != session.id)])
    self.touch()
def remove_session(self, session):
    self.session_ids = ','.join([str(id) for id in self.get_session_ids() if (id != session.id)])
    self.touch()