LinkManagement::getChildren() does not include product ID's (and visibility)

[kanduvisla]

When I'm using the Service Contract Magento\ConfigurableProduct\Api\LinkManagementInterface::getChildren($sku), I get an array of child products, but those products don't seem to be complete. For instance, getId() and getVisibility() returns NULL on those child products.

Preconditions

1. Magento 2.1.3

Steps to reproduce

Get child products using the LinkManagementInterface service contract and try to get ID and visibility of the results:

public function __construct(
    LinkManagementInterface $linkManagement
) {
    $this->linkManagement = $linkManagement;
}

public function example()
{
    $childProducts = $this->linkManagement->getChildren('SKU_OF_CONFIGURABLE');
    foreach ($childProducts as $childProduct) {
        var_dump($childProduct->getId());
        var_dump($childProduct->getVisibility());
    }
}

Expected result

I should get the ID and Visibility parameter of the child products

Actual result

I get NULL and NULL

Workaround

A possible workaround is to explicitly load the product, but this causes some overhead:

foreach ($childProducts as $childProduct) {
    // Use ProductRepositoryInterface to explicitly load the product:
    $childProduct = $this->productRepository->get($childProduct->getSku());
    var_dump($childProduct->getId());
    var_dump($childProduct->getVisibility());
}

[KrystynaKabannyk]

Hello @kanduvisla, could you please describe steps to reproduce in more detains?
Thank you!

[kanduvisla]

@KrystynaKabannyk I think my steps are pretty self-explanatory. Just create an instance of Magento\ConfigurableProduct\Api\LinkManagementInterface and call the getChildren()-method. But if you insist:

Step 1: Create a configurable product with some simples.
Step 2: Create a class with at least this structure:

class LinkManagementBugExample
{
    public function __construct(
        LinkManagementInterface $linkManagement
    ) {
        $this->linkManagement = $linkManagement;
    }

    public function example(string $sku)
    {
        $childProducts = $this->linkManagement->getChildren($sku);
        foreach ($childProducts as $childProduct) {
            var_dump($childProduct->getId());
            var_dump($childProduct->getVisibility());
        }
    }
}

Step 3: Run the example()-method with the SKU of the configurable.

The resulted output is 2 times NULL, rather than the ID and the visibility of the child product.

[kanduvisla]

Any updates on this issue? I ran into it again today. As a workaround I have to include the product resource as a dependency:

$this->productResource->getIdBySku($child->getSku())

[kanduvisla]

Still no update on this? Can at least anyone confirm this issue? Or is it just me?

[magento-engcom-team]

@kanduvisla, thank you for your report.
We've created internal ticket(s) MAGETWO-81151 to track progress on the issue.

[okorshenko]

Hi @kanduvisla
The issue has been fixed and delivered in 2.2-develop branch. Will be available with upcoming patch release.