Recursive Laravel category output?

Question

Online shopping

Hello. I am making an online store on Laravel and already at the initial stage there was a snag: I don’t know how to display a list of categories. There is a categories table:
id - int
title - varchar
url - CNC
parent_id - parent ID and a Category
model class that has a getSubCategories method :

public function getSubCategories($categoryId)
{
  return Category::where('parent_id', '=', $categoryId);
}

In view layout/navigation.blade.php I also wanted to make a recursive output. Can you please tell me how this can be implemented?
PS I tried to make a function in the navigation file, but Laravel swears at curly braces.
Example:

<Ul>
  <li>Категория 1</li>
  <li>Категория 2
  <ul>
    <li>Подкатегория 1</li>
    <li>Подкатегория 2</li>
    <li>Подкатегория 3
    <ul>
      <li>Подкатегория 1</li>
      <li>Подкатегория 2</li>
      <li>Подкатегория 3</li>
    </ul>
    </li>
  </ul>
  </li>
  <li>Категория 3</li>
</Ul>

UPD.: Stopped at nested sets

Answer 1

Get rid of the method, use link to yourself
public function children()
{
return $this->hasMany('Category', 'parent_id', 'id');
}
When sampling for optimization, you can use Category::with('children'). For output, it's better to write a recursive blade helper, or use a recursive include to check for children.

// template_name.blade.php
@foreach($items as $item)
@if ($item->children)
    @include('template_name', ['items' => $item->children])
@endif
@endforeach

Answer 2

There should be no curly braces in a blade other than double or triple. Everything else, such as conditions or loops, is kissed without brackets through the dog