Steps to reproduce:

1. Import coonfigurable products in Adobe commerce
2. Truncate the product entity and reset the auto increment to start from 1
3. Reimport the products in Adobe commerce

Actual result
Undefied index exception while returning the variants collection at
vendor/scandipwa/catalog-graphql/src/Model/Variant/Collection.php while accessing $childCollectionMap

Expected result
Variants should be returns for the configurable details

Reason for this issue
Adobe commerce uses row_id from product_entity for mapping the child products and its parent product, where as in the Collection class it uses entity_id to access this.

If the products are imported without resetting the auto incrementer, it works fine as the value for entity_id and row_id will be same.

Solution
We can use
Magento\Framework\EntityManager\MetadataPool to fetch the row_id or entity_id depending on the Magento version where ScandiPWA is used.

For example:

 $linkField = $this->metadataPool->getMetadata(ProductInterface::class)->getLinkField();
 $productId = $product->getData($linkField);

Instead of using $product->getId();
This way of accessing the products will make sure Scandipwa is compatible with Magento Commerce data.

Versions

• ScandiPWA: 5.2.7
• scandipwa/catalog-graphql