BookStack/app/Ownable.php

<?php namespace BookStack;

use BookStack\Auth\User;

/**
 * @property int created_by
 * @property int updated_by
 */
abstract class Ownable extends Model
{
    /**
     * Relation for the user that created this entity.
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function createdBy()
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    /**
     * Relation for the user that updated this entity.
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function updatedBy()
    {
        return $this->belongsTo(User::class, 'updated_by');
    }

}