sorting arraycollection

    /**
     * @MongoDB\PreFlush
     * @return ArrayCollection
     */
    public function orderSteps()
    {
        //workaround to sort steps collection
        $iterator = $this->steps->getIterator();
        $iterator->uasort(
            function ($a, $b) {
                return ($a->getOrder() < $b->getOrder()) ? -1 : 1;
            }
        );
        $this->steps = new ArrayCollection(iterator_to_array($iterator));
    }