Default order by - Sort by - customization

[Mateusz321]

In all categories products are sorted according to the default filter Sort by: New products first, I would like to know if it's possible to set some categories sorting on the position ''Random''? For example, the category: home, cars, pets should be set to ''New products first''
while the category flowers on ''Random''. Thank you

[Mateusz321]

I guessed so too, can you please advise which file should be modified, I'm not an expert yet... Thank you

[Knowband Plugins]

in classes/controller/ProductListingFrontController.php file, getProductSearchVariables() is used to return the product listing for category page.

Replace

if (($encodedSortOrder = Tools::getValue('order'))) {
            $query->setSortOrder(SortOrder::newFromString(
                $encodedSortOrder
            ));
        }

with

if (($encodedSortOrder = Tools::getValue('order'))) {
            $query->setSortOrder(SortOrder::newFromString(
                $encodedSortOrder
            ));
        } else {

$query->setSortOrder(SortOrder::newFromString(
                ["Your sorting method"]
            ));

}