Adding categories to product prestashop

Question

So I've been dealing with this problem for quite some time and can't find a clear solution. So basically I'm adding new products directly into db using Product object. For now it went well but I can't manage to link new products with a category.

$cat_ids = [];
    foreach ($value['kat_naziv'] as $cat_val) {
    $cat_ids[] = (int)$luceed->selectCategoryIds($cat_val)[$cat_val]['id_category'];
}

$product->id_category = 3;
$product->id_category_default = 3;

$product->save();

$product->addToCategories($cat_ids);

So basically $cat_ids is an array of integers that i'm getting from db where name is something i pass as a parameter to selectCategoryIds;

What is the problem here why it wont associate newly created product with categories i give to it

Answer 1

@FMEModule That's exactly what i did there but i've filled the array with the id's of categories from the database

Anyways I ended up writing my own queries for associatting products with categories