Why does getParentIdsByChild return an empty array for a Child (Simple) Product

Question

I have injected.

Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable

In my constructor as $configProductModel

$this->configProductModel->getParentsIdsByChild($product->getId());
// outputs [];

I know this product to be a simple Product and I'm trying to load the configurable Product so I can get the Parent SKU

Answer 1

To get configure product id from its the simple product use below code.

namespace Vendor\Frontendsample\Controller\Index;

class Index extends \Magento\Framework\App\Action\Action
{
    protected $configure;
    protected $resultPageFactory;

    /**
     * @param \Magento\Framework\App\Action\Context $context
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     * @param \Magento\ConfigurableProduct\Model\Product\Type\Configurable $configure
     */
    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\ConfigurableProduct\Model\Product\Type\Configurable $configure
    ){
        $this->configure = $configure;
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        $productId = 12;//your simple product id of configure product
        $parentIds = $this->configure->getParentIdsByChild($productId);
        $parentId = array_shift($parentIds);
        print_r($parentId);
    }
}

If you getting nothing from above code, then you should check child(simple) product id of parent(configure) product id, may be its wrong or may be something wrong with your configure product in admin side.