def add(self, ver, updates):
if ver in self.versions:
msg = 'Version %s already exists in history.' % ver
raise exception.ProgrammingError(reason=msg)
self[ver] = self[self.get_current()].copy()
self.versions.append(ver)
self[ver].update(updates)
def cinder_ovo_cls_init(cls):
"""This method is called on OVO registration and sets the DB model."""
# Persistent Versioned Objects Classes should have a DB model, and if
# they don't, then we have a problem and we must raise an exception on
# registration.
try:
cls.model = db.get_model_for_versioned_object(cls)
except (ImportError, AttributeError):
msg = _("Couldn't find ORM model for Persistent Versioned "
"Object %s.") % cls.obj_name()
raise exception.ProgrammingError(reason=msg)
def is_snapshot(self):
if self.obj_attr_is_set('snapshot') == self.obj_attr_is_set('volume'):
msg = _("Either snapshot or volume field should be set.")
raise exception.ProgrammingError(message=msg)
return self.obj_attr_is_set('snapshot')
