Magento 2 getMediaGalleryImages() return null

Question

I am writing an import product job on Magento 2. I want to delete all product images if I need to update the product. I try to use $product->getMediaGalleryImages() to get all the images from the product but it returns null after running. I ensure that the product has an image. Follows is the code I tried.

$product = $objectManager->create('\Magento\Catalog\Model\Product');
$product = $product->getCollection()->addFieldToSelect("*")->addAttributeToFilter('sku', 'sku-01')->getFirstItem();
$images = $product->getMediaGalleryImages(); // it return null

And follows is the code to upload product image.

$product->setMediaGallery(array('images' => array(), 'values' => array()))
                            ->addImageToMediaGallery($image_directory, array('image', 'thumbnail', 'small_image'), false, false);

Answer 1

You can get the product media gallery images as given below.

Method 1: Use dependency. (Recommended)

Create a helper

app/code/Vendor/Module/Helper/Data.php

<?php

namespace Vendor\Module\Helper;

use Magento\Catalog\Model\Product\Gallery\ReadHandler as GalleryReadHandler;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $galleryReadHandler;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        GalleryReadHandler $galleryReadHandler
    )
    {
        $this->galleryReadHandler = $galleryReadHandler;
        parent::__construct($context);
    }

    /** Add image gallery to $product */
    public function addGallery($product) {
        $this->galleryReadHandler->execute($product);
    }

}

Now add code to your phtml file as below.

$_helperGallery = $this->helper('Vendor\Module\Helper\Data');
$_helperGallery->addGallery($product);
$images = $product->getMediaGalleryImages();
foreach ($images as $image) {
    print_r($image->getData());
}

Method 2: Use objectManager directly in your phtml file. (Not Recommended)

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$objectManager->get("Magento\Catalog\Model\Product\Gallery\ReadHandler")->execute($product);
$images = $product->getMediaGalleryImages();
foreach ($images as $image) {
    print_r($image->getData());
}

Answer 2

/* Add media gallery data to loaded items
 * @since 101.0.1
 * addMediaGalleryData()
 */
$product = $objectManager->create('\Magento\Catalog\Model\Product');
$product = $product->getCollection()
->addFieldToSelect("*")
->addAttributeToFilter('sku', 'sku-01')
->addMediaGalleryData()
->getFirstItem();
$images = $product->getMediaGalleryImages();

Try to add addMediaGalleryData() to your collection. Without it, getMediaGalleryImages() will always return null

Answer 3

Your issue may be with this code

$product = $product->getCollection()->addFieldToSelect("*")->addAttributeToFilter('sku', 'sku-01')->getFirstItem();

Try below code instead

$product = $objectManager->create('\Magento\Catalog\Model\Product');
$product = $product->loadByAttribute('sku', 'sku-01');
$images = $product->getMediaGalleryImages(); 

Note:- you should not use object manager directly instead use ProductRepository check this answer for proper Magento 2 way to load product