catalog_product_relation is unsuitable for mview.

[bricht]

Summary (*)

I am trying to implement a custom indexer for 'Product Variants' as a part of these projects:
https://github.com/magento/catalog-storefront/ and https://github.com/magento/commerce-data-export

This indexer contains data on product variants / product relations.
In order to efficiently trigger a reindex in 'Update on Schedule' mode, I need to add an mview subscription to catalog_product_relation. Since SQL triggers do not work with ON DELETE CASCADE this is not possible at the moment.

Examples (*)

Proposed solution

I propose to remove the foreign keys and add an afterDelete() plugin, which deletes the entries from relation table, when the relevant products are deleted.

https://github.com/magento/partners-magento2ee/pull/426
#31048

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[m2-assistant]

Hi @bricht. Thank you for your report.
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[engcom-Bravo]

Hi @bricht,

Thank you for reporting and collaboration.Verified the issue on Magento 2.4-develop instance and this is not a bug and it is an improvement. Hence we are considering this a feature request.

Thanks.

[martin-cod]

The same bug happens when mview is subscribed to catalog_category_product table. Delete trigger is not fired when product is removed and rows in catalog_category_product table are removed in cascade.

Probably, the better solution would be to have DeleteHandler for the product entity in EntityManager

[martin-cod]

I have just added DeleteHandler classes to support mview subscriptions on catalog_category_product and catalog_product_relation tables
https://github.com/hawksearch/index-by-schedule-magento2