magento 2 get child product image thumbnail

Question

How to get child product image thumbnail in sales order view in Back-end ?

my Magento is 2.1.6

This code working but i need to get order current image not configurable image all the time if i created order from the backend and select the configurable product and choosing another color instead of default.

 $_item = $block->getItem();
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$product = $objectManager->create('Magento\Catalog\Model\Product')->load($_item->getProduct()->getId());
$thitem = $_item->getProduct()->getThumbnail();

Also How to get image url by sku if possible?

Answer 1

instead of use $_item->getProduct()->getId()

You should use sku $_item->getSku();

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$product = $objectManager->create('\Magento\Catalog\Model\ProductFactory'->create());
$product = $this->productFactory->create();
$product->load($product->getIdBySku($_item->getSku()));
$thitem = $product->getThumbnail();

$fullImageUrl =$block->getUrl('pub/media/catalog').'product'.$product->getThumbnail()

Suggestion:

Use of direct product object is not good idea

Also suggest to inject \Magento\Catalog\Model\ProductFactory to your block class

Answer 2

My solution without using ObjectManager.

When you have configurable product in order, then actually 2 items are added (configurable and simple). For configurable products we have to iterate over all (not only visible) items and replace our product when items parent id is equal to current item id.

use Magento\ConfigurableProduct\Model\Product\Type\Configurable;

/** @var  $_item \Magento\Sales\Model\Order\Item */
$_item = $block->getItem();
$productForThumbnail = $_item->getProduct();

if ($_item->getProductType() === Configurable::TYPE_CODE){
    foreach ($block->getOrder()->getAllItems() as $orderItem){
        if ($orderItem->getParentItemId() == $_item->getId()){
            $productForThumbnail = $orderItem->getProduct();
            break;
        }
    }
}

Then we can easily add image:

$imageUrl = $this->helper('Magento\Catalog\Helper\Image')->init($productForThumbnail,'cart_page_product_thumbnail')->getUrl();

Answer 3

If image not present then use placeholder.

$images= $imgurl.$product->getImage();

$ch = curl_init($images);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$retcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
if($retcode==200) {
    $product_images = $images;
}
else
{
    $product_images ="STORE_URL/pub/static/frontend/TemplateMonster/Spiceli/en_US/Magento_Catalog/images/product/placeholder/image.jpg";
}