What is the best method to retrieve a SINGLE ITEM order details in Magento2?

Question

I am currently using the

\Magento\Sales\Model\OrderFactory $_orderFactory

and

loadByIncrementId($id)

in my custom block and calling it in my .phtml file.

I get basic details of the order, but I have only single item in the order, still I have to use the $bookingDetail->getAllItems() in foreach loop. Is it really necessary? Can't we get a single item detail without the foreach loop? Also about single Product option: getproductOptions() loop for single option/value?

What is the best practice?

Answer 1

There is no need to use order factory to fetch a particular Order item.

That case, you can use order item repository class Magento\Sales\Api\OrderItemRepositoryInterface

That has get() and getList() method using these you can fetch a particular item data.

If you have an order item id then you can use get() and that is the best method in that case.

But if have an order id then you can use getList()` and using Search Criteria , you can an order items order.

You can follow below article for how you can filter a Magento 2 Object Repository

Filtering a Magento 2 Object Repository

Magento2: How to add multiple AND and OR conditions to filter/filterGroups?

Same Code:

<?php


namespace StackExchange\Magento\Model;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Sales\Api\OrderItemRepositoryInterface;

class OrderItem {

    /**
     * @var \Magento\Framework\Api\SearchCriteriaBuilder
     */
    private $searchCriteriaBuilder;

    /**
     * @var \Magento\Framework\Api\Search\FilterGroupBuilder
     */
    private $filterGroupBuilder;

    /**
     * @var \Magento\Framework\Api\FilterBuilder
     */
    private $filterBuilder;

    /**
     * @var \Magento\Sales\Api\OrderItemRepositoryInterface
     */
    private $orderItemRepository;

    public function __construct(
        OrderItemRepositoryInterface $orderItemRepository,
        \Magento\Framework\Api\SearchCriteriaBuilder $searchCriteriaBuilder,
        \Magento\Framework\Api\FilterBuilder $filterBuilder,
        \Magento\Framework\Api\Search\FilterGroupBuilder $filterGroupBuilder     
    ) {

        $this->orderItemRepository = $orderItemRepository;
        $this->filterBuilder = $filterBuilder;
        $this->filterGroupBuilder = $filterGroupBuilder;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
    }
    public function getOrderItemByOrderItemId()
    {
     $id = 99;
     try{
         $orderItem = $this->orderItemRepository->get($id);
         return $orderItem;
     } catch (NoSuchEntityException $ex) {
         return false;
     }

     return false;
    }
    public function getOrderItemByOrderId()
    {
        $orderId = 15;
        $productId = 105;

        $searchCriteria = $this->searchCriteriaBuilder->addFilter('order_id', $orderId)
                                    ->addFilter('product_id', $productId);
        $orderItems = $this->orderItemRepository->getList($searchCriteria);
        if($orderItems->getTotalCount() > 0)
        {
            $orderItemsData = $orderItems->getItems();
            // Running foreach as item collection in array
            foreach($orderItemsData as $orderItem)
            {
                // 
                $orderItem;
            }
        }

    }
}