From 9dfcc0918f797a0937b688426232e17898648f94 Mon Sep 17 00:00:00 2001
From: Shadowghost <Ghost_of_Stone@web.de>
Date: Wed, 20 May 2026 11:34:45 +0200
Subject: Add support for filtering boxsets by parentId

---
 Jellyfin.Api/Controllers/ItemsController.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'Jellyfin.Api/Controllers/ItemsController.cs')

diff --git a/Jellyfin.Api/Controllers/ItemsController.cs b/Jellyfin.Api/Controllers/ItemsController.cs
index 43e4737694..f3f0bd2482 100644
--- a/Jellyfin.Api/Controllers/ItemsController.cs
+++ b/Jellyfin.Api/Controllers/ItemsController.cs
@@ -280,10 +280,17 @@ public class ItemsController : BaseJellyfinApiController
         var item = _libraryManager.GetParentItem(parentId, userId);
         QueryResult<BaseItem> result;
 
+        Guid[] boxSetLinkedChildAncestorIds = [];
         if (includeItemTypes.Length == 1
             && includeItemTypes[0] == BaseItemKind.BoxSet
             && item is not BoxSet)
         {
+            var isBoxSetsLibrary = item is IHasCollectionType hct && hct.CollectionType == CollectionType.boxsets;
+            if (parentId.HasValue && item is not UserRootFolder && !isBoxSetsLibrary)
+            {
+                boxSetLinkedChildAncestorIds = [parentId.Value];
+            }
+
             parentId = null;
             item = _libraryManager.GetUserRootFolder();
         }
@@ -405,6 +412,7 @@ public class ItemsController : BaseJellyfinApiController
                 MaxPremiereDate = maxPremiereDate?.ToUniversalTime(),
                 AudioLanguages = audioLanguages,
                 SubtitleLanguages = subtitleLanguages,
+                LinkedChildAncestorIds = boxSetLinkedChildAncestorIds,
             };
 
             if (ids.Length != 0 || !string.IsNullOrWhiteSpace(searchTerm))
-- 
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