def _set_or_delete_marker_for_migrate_instances(context, marker=None):
# We need to delete the old marker anyway, which no longer corresponds to
# the last instance we checked (if there was a marker)...
# NOTE(sbauza): delete() deletes rows that match the query and if none
# are found, returns 0 hits.
context.session.query(
api_models.RequestSpec).filter_by(instance_uuid=FAKE_UUID).delete()
if marker is not None:
# ... but there can be a new marker to set
db_mapping = api_models.RequestSpec()
db_mapping.update({'instance_uuid': FAKE_UUID, 'spec': marker})
db_mapping.save(context.session)
def _create_in_db(context, updates):
db_spec = api_models.RequestSpec()
db_spec.update(updates)
db_spec.save(context.session)
return db_spec