def get_object(cls, context, **kwargs):
"""
Fetch object from DB and convert it to a versioned object.
:param context:
:param kwargs: multiple keys defined by key=value pairs
:return: single object of NeutronDbObject class
"""
lookup_keys = set(kwargs.keys())
all_keys = itertools.chain([cls.primary_keys], cls.unique_keys)
if not any(lookup_keys.issuperset(keys) for keys in all_keys):
missing_keys = set(cls.primary_keys).difference(lookup_keys)
raise o_exc.NeutronPrimaryKeyMissing(object_class=cls.__name__,
missing_keys=missing_keys)
with db_api.autonested_transaction(context.session):
db_obj = obj_db_api.get_object(context, cls.db_model,
**cls.modify_fields_to_db(kwargs))
if db_obj:
return cls._load_object(context, db_obj)
def get_object(cls, context, **kwargs):
"""
Return the first result of given context or None if the result doesn't
contain any row. Next, convert it to a versioned object.
:param context:
:param kwargs: multiple keys defined by key=value pairs
:return: single object of NeutronDbObject class or None
"""
lookup_keys = set(kwargs.keys())
all_keys = itertools.chain([cls.primary_keys], cls.unique_keys)
if not any(lookup_keys.issuperset(keys) for keys in all_keys):
missing_keys = set(cls.primary_keys).difference(lookup_keys)
raise o_exc.NeutronPrimaryKeyMissing(object_class=cls.__name__,
missing_keys=missing_keys)
with context.session.begin(subtransactions=True):
db_obj = obj_db_api.get_object(context, cls.db_model,
**cls.modify_fields_to_db(kwargs))
if db_obj:
return cls._load_object(context, db_obj)