@staticmethod
    def _from_db_object(context, fixedip, db_fixedip, expected_attrs=None):
        if expected_attrs is None:
            expected_attrs = []
        for field in fixedip.fields:
            if field == 'default_route':
                # NOTE(danms): This field is only set when doing a
                # FixedIPList.get_by_network() because it's a relatively
                # special-case thing, so skip it here
                continue
            if field not in FIXED_IP_OPTIONAL_ATTRS:
                fixedip[field] = db_fixedip[field]
        # NOTE(danms): Instance could be deleted, and thus None
        if 'instance' in expected_attrs:
            fixedip.instance = objects.Instance._from_db_object(
                context,
                objects.Instance(context),
                db_fixedip['instance']) if db_fixedip['instance'] else None
        if 'network' in expected_attrs:
            fixedip.network = objects.Network._from_db_object(
                context,
                objects.Network(context),
                db_fixedip['network']) if db_fixedip['network'] else None
        if 'virtual_interface' in expected_attrs:
            db_vif = db_fixedip['virtual_interface']
            vif = objects.VirtualInterface._from_db_object(
                context,
                objects.VirtualInterface(context),
                db_fixedip['virtual_interface']) if db_vif else None
            fixedip.virtual_interface = vif
        if 'floating_ips' in expected_attrs:
            fixedip.floating_ips = obj_base.obj_make_list(
                    context, objects.FloatingIPList(context),
                    objects.FloatingIP, db_fixedip['floating_ips'])
        fixedip._context = context
        fixedip.obj_reset_changes()
        return fixedip
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/objects/fixed_ip.py/FixedIP._from_db_object/original