BookStack/app/Page.php

<?php

namespace Oxbow;

use Illuminate\Database\Eloquent\Model;

class Page extends Model
{
    protected $fillable = ['name', 'html', 'priority'];

    protected $simpleAttributes = ['name', 'id', 'slug'];

    public function toSimpleArray()
    {
        $array = array_intersect_key($this->toArray(), array_flip($this->simpleAttributes));
        $array['url'] = $this->getUrl();
        return $array;
    }

    public function book()
    {
        return $this->belongsTo('Oxbow\Book');
    }

    public function children()
    {
        return $this->hasMany('Oxbow\Page')->orderBy('priority', 'ASC');
    }

    public function parent()
    {
        return $this->belongsTo('Oxbow\Page', 'page_id');
    }

    public function getUrl()
    {
        return '/books/' . $this->book->slug . '/page/' . $this->slug;
    }

}