BookStack/app/ImageRevision.php

<?php

namespace BookStack;

use Illuminate\Database\Eloquent\Model;

class ImageRevision 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');
    }

    /**
     * Get the image that this is a revision of.
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function image()
    {
        return $this->belongsTo(Image::class);
    }
}