Fix Product model

[naydav]

Full context in documentation

[HLD] Inconsistent saving of Stock Data

Description

1. Replace 'getExtensionAttributes' method

/**
 * {@inheritdoc}
 *
 * @return \Magento\Catalog\Api\Data\ProductExtensionInterface
 */
public function getExtensionAttributes()
{
    $extensionAttributes = $this->_getExtensionAttributes();
    if (!$extensionAttributes) {
        /** @var \Magento\Catalog\Api\Data\ProductExtensionInterface $extensionAttributes */
        $extensionAttributes = $this->extensionAttributesFactory->create(
            \Magento\Catalog\Api\Data\ProductInterface::class
        );
        $this->setExtensionAttributes($extensionAttributes);
    }
    return $extensionAttributes;
}

After replacing, we nave a problem: the extensionAttributes is recreated every time the method is called.

2. Fix 'toArray' and 'fromArray'

The entities:

• \Magento\Catalog\Model\Product::toArray
• \Magento\Catalog\Model\Product::fromArray
  must be changed to get the stock inventory data from the current StockItem.

3. Remove reindexing from 'afterSave'

Remove the following from the \Magento\Catalog\Model\Product::afterSave:

if ($this->getStockData()) {
    $this->setForceReindexEavRequired(true);
}