Opencart sql query from unique table - php

Question

I have a strongly modified opencart store.
I would like to display all products from subcategories on the main category pages. This is the half-done code from my product model file.
} else {
$cat_sql = "SELECT `category_id` FROM `" . DB_PREFIX . "category_path` WHERE `path_id` = '" . (int)$data['filter_category_id'] . "'";
$cat_query = $this->db->query($cat_sql);
if ($cat_query->num_rows) {
$sql .= " AND (p2c.category_id = '" . (int)$data['filter_category_id'] . "'";
foreach($cat_query->rows as $cat) {
$sql .= " OR p2c.category_id = '" . (int)$cat['category_id'] . "'";
}
$sql .= ")";
} else {
$sql .= " AND p2c.category_id = '" . (int)$data['filter_category_id'] . "'";
}
}
It's supposed to display those products.
But now I have another table for multiple parent categories.
My question is: how can I display the products from the subcategories, where I just have parent_id not path_id.
The multiple category table is simple.
category_id / parent_id
How can I modify the code above so that it displays all products from subcategories where they don't have path_id only parent_id?

Answer 1

You dont need to modify sql just pass extra parameter 'filter_sub_category' => true and it will list out all the product including child category
$filter_data = array(
'filter_category_id' => $category_id,
'filter_sub_category' => true
);
$results = $this->model_catalog_product->getProducts($filter_data);