Option to save Product without re-saving its Variants

[davist11]

We have a really large Commerce install and some products have very large numbers of variants. This data is being imported from a PIM (https://www.akeneo.com/) via custom PHP.

Saving a product with a large number of variants can take quite a bit of time since after a product is saved, it saves each of its variants:

commerce/src/elements/Product.php

Lines 810 to 825 in 28e1a3f

	foreach ($this->getVariants() as $variant) {
	if ($isNew) {
	$variant->productId = $this->id;
	$variant->siteId = $this->siteId;
	}
	$keepVariantIds[] = $variant->id;
	Craft::$app->getElements()->saveElement($variant, false);
	// We already have set the default to the correct variant in beforeSave()
	if ($variant->isDefault) {
	$this->defaultVariantId = $variant->id;
	Craft::$app->getDb()->createCommand()->update(Table::PRODUCTS, ['defaultVariantId' => $variant->id], ['id' => $this->id])->execute();
	}
	}

It would drastically improve import speed for us (and others may see value) to be able to save a product without saving all of its variants at the same time.