def update_synthetic_fields(cls, bases, dct):
if not dct.get('synthetic_fields', None):
synthetic_attr = cls.get_attribute('synthetic_fields', bases, dct)
dct['synthetic_fields'] = synthetic_attr or []
if 'shared' in dct['synthetic_fields']:
raise exceptions.ObjectActionError(
action=_('shared attribute switching to synthetic'),
reason=_('already a synthetic attribute'))
dct['synthetic_fields'].append('shared')
def _check_shared_project_id(self, action):
if self.shared is False and not self.project_id:
raise n_exc.ObjectActionError(
action=action,
reason='if NetworkSegmentRange is not shared, it must have a '
'project_id')
