Correct Way to get Order items in magento 2

This is how the different methods to get items from an order work:

This is how the different methods to get items from an order work:

• getItems(): returns array of items from loaded order item collection
• getAllItems(): returns array of all items that are not marked as deleted
• getAllVisibleItems(): returns array of all items that are not marked as deleted and do not have a parent item

So to get only the configurable product and not its associated product, getAllVisibleItems() is the correct method:

• the single simple item does not have a parent => visible
• the configurable item does not have a parent => visible
• the associated simple item has a parent => not visible

Note that unfortunately, as of magento-2.0 only getItems() is part of the service contract in Magento\Sales\Api\Data\OrderInterface.

/**
     * Retrieve quote items array
     *
     * @return array
     */
    public function getAllItems()
    {
        $items = [];
        foreach ($this->getItemsCollection() as $item) {
            /** @var \Magento\Quote\Model\ResourceModel\Quote\Item $item */
            if (!$item->isDeleted()) {
                $items[] = $item;
            }
        }
        return $items;
    }

    /**
     * Get array of all items what can be display directly
     *
     * @return \Magento\Quote\Model\Quote\Item[]
     */
    public function getAllVisibleItems()
    {
        $items = [];
        foreach ($this->getItemsCollection() as $item) {
            //echo $item->getId()."<br>";
            if (!$item->isDeleted() && !$item->getParentItemId()) {
                $items[] = $item;
            }
        }
        return $items;
    }