BookStack/app/Entities/Tools/SiblingFetcher.php

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<?php namespace BookStack\Entities\Tools;
use BookStack\Entities\EntityProvider;
use BookStack\Entities\Models\Book;
use BookStack\Entities\Models\Bookshelf;
use Illuminate\Support\Collection;
class SiblingFetcher
{
/**
* Search among the siblings of the entity of given type and id.
*/
public function fetch(string $entityType, int $entityId): Collection
{
$entity = (new EntityProvider)->get($entityType)->visible()->findOrFail($entityId);
$entities = [];
// Page in chapter
if ($entity->isA('page') && $entity->chapter) {
$entities = $entity->chapter->getVisiblePages();
}
// Page in book or chapter
if (($entity->isA('page') && !$entity->chapter) || $entity->isA('chapter')) {
$entities = $entity->book->getDirectChildren();
}
// Book
// Gets just the books in a shelf if shelf is in context
if ($entity->isA('book')) {
$contextShelf = (new ShelfContext)->getContextualShelfForBook($entity);
if ($contextShelf) {
$entities = $contextShelf->visibleBooks()->get();
} else {
$entities = Book::visible()->get();
}
}
// Shelve
if ($entity->isA('bookshelf')) {
$entities = Bookshelf::visible()->get();
}
return $entities;
}
}