def create_from(self, entity):
"""Sub-class hook: create from entity."""
if not entity:
msg = "Must supply non-None {0}.".format(self._do_entity_name)
raise exception.Invalid(msg)
if entity.id:
msg = "Must supply {0} with id=None(i.e. new entity).".format(
self._do_entity_name)
raise exception.Invalid(msg)
LOG.debug("Begin create from...")
session = get_session()
with session.begin():
# Validate the attributes before we go any further. From my
# (unknown Glance developer) investigation, the @validates
# decorator does not validate
# on new records, only on existing records, which is, well,
# idiotic.
values = self._do_validate(entity.to_dict())
try:
LOG.debug("Saving entity...")
entity.save(session=session)
except sqlalchemy.exc.IntegrityError:
LOG.exception('Problem saving entity for create')
raise exception.Duplicate("Entity ID %s already exists!" %
values['id'])
return entity
def _update(self, entity_id, values, purge_props=False):
"""
Used internally by update()
:param values: A dict of attributes to set
:param entity_id: If None, create the entity, otherwise,
find and update it
"""
session = get_session()
with session.begin():
if entity_id:
entity_ref = self.get(entity_id, session=session)
values['updated_at'] = timeutils.utcnow()
else:
self._do_convert_values(values)
entity_ref = self._do_create_instance()
# Need to canonicalize ownership
if 'owner' in values and not values['owner']:
values['owner'] = None
entity_ref.update(values)
# Validate the attributes before we go any further. From my
# (unknown Glance developer) investigation, the @validates
# decorator does not validate
# on new records, only on existing records, which is, well,
# idiotic.
self._do_validate(entity_ref.to_dict())
self._update_values(entity_ref, values)
try:
entity_ref.save(session=session)
except sqlalchemy.exc.IntegrityError:
LOG.exception('Problem saving entity for _update')
if entity_id:
raise exception.NotFound("Entity ID %s not found" %
entity_id)
else:
raise exception.Duplicate("Entity ID %s already exists!" %
values['id'])
return self.get(entity_ref.id)
def _raise_entity_already_exists(entity_name):
raise exception.Duplicate(
u._("Entity '{entity_name}' "
"already exists").format(entity_name=entity_name))