Opencart full category ul li tree - opencart

Question

Right now in opencart the system is limited to only showing 2 levels of categories. Does anyone know of a class to get all sub-categories and a full ul li tree?
For example: If you have ever used oscommerce it will show the full tree of sub-cats in the side category menu where as opencart is limited to only two levels.
The default code is like
$categories = $this->model_catalog_category->getCategories(0);
foreach ($categories as $category) {
$children_data = array();
if ($category['category_id'] == $data['category_id']) {
$children = $this->model_catalog_category->getCategories($category['category_id']);
foreach($children as $child) {
$filter_data = array('filter_category_id' => $child['category_id'], 'filter_sub_category' => true);
$children_data[] = array(
'category_id' => $child['category_id'],
'name' => $child['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
'href' => $this->url->link('product/category', 'path=' . $category['category_id'] . '_' . $child['category_id'])
);
}
}
However it only goes two levels, I am looking for all levels to build out an accordion menu.
Further I am not looking for someone to do this, (unless you want), but maybe you can point me in the right direction or to an existing class that will achieve this.

Answer 1

You'll need to add each sub-level manually for a 3rd, for a 4th etc. There is no way to just get all of them in one shot.
There was an older stackoverflow thread with a solution on how to add a 3rd level. Perhaps it will work with your version of OC:
get third level category in opencart 2
You basically will need to edit the controller and tpl files for category. If that's too much for you, they sell an extension on their marketplace for it, too.