BookStack/app/References/ModelResolvers/ChapterLinkModelResolver.php

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<?php
namespace BookStack\References\ModelResolvers;
use BookStack\Entities\Models\Chapter;
use BookStack\Model;
class ChapterLinkModelResolver implements CrossLinkModelResolver
{
public function resolve(string $link): ?Model
{
$pattern = '/^' . preg_quote(url('/books'), '/') . '\/([\w-]+)' . '\/chapter\/' . '([\w-]+)' . '([#?\/]|$)/';
$matches = [];
$match = preg_match($pattern, $link, $matches);
if (!$match) {
return null;
}
$bookSlug = $matches[1];
$chapterSlug = $matches[2];
/** @var ?Chapter $model */
$model = Chapter::query()->whereSlugs($bookSlug, $chapterSlug)->first(['id']);
return $model;
}
}