category hierarchy laravel

category hierarchy laravel
<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Category extends Model
{
// One level child
public function child() {
return $this->hasMany('App\Category', 'parent_category_id');
}

// Recursive children
public function children() {
return $this->hasMany('App\Category', 'parent_category_id')
->with('children');
}

// One level parent
public function parent() {
return $this->belongsTo('App\Category', 'parent_category_id');
}

// Recursive parents
public function parents() {
return $this->belongsTo('App\Category', 'parent_category_id')
->with('parent');
}

}

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