Spot\Mapper::saveBelongsToRelations PHP Method

    public function saveBelongsToRelations(EntityInterface $entity, array $options = [])
    {
        $relations = $entity->relations($this, $entity);
        $lastResult = false;
        foreach ($relations as $relationName => $relation) {
            if ($relation instanceof Relation\BelongsTo) {
                $lastResult = $relation->save($entity, $relationName, $options);
            }
        }
        return $lastResult;
    }