Laravel Model Self Reference

SelfReferenceTrait.php

<?php

namespace App\Traits;

trait SelfReferenceTrait
{
    protected $parentColumn = 'parent_id';
    
    public function parent()
    {
        return $this->belongsTo(static::class);
    }

    public function children()
    {
        return $this->hasMany(static::class, $this->parentColumn);
    }

    public function allChildren()
    {
        return $this->children()->with('allChildren');
    }

    public function root()
    {
        return $this->parent
            ? $this->parent->root()
            : $this;
    }
}

Thank you sir, it works now, but only for one model instance .
Do you have any idea on how can i call it for all the model instances returned?