From 27d898e59e5c225baa3db0ee114f1c4034b74e31 Mon Sep 17 00:00:00 2001
From: Shadowghost <Ghost_of_Stone@web.de>
Date: Sat, 29 Aug 2026 21:39:14 +0200
Subject: Count a season's episodes by the season they belong to

---
 .../Item/ItemCountService.cs                       | 31 +++++++++++++++++-----
 1 file changed, 25 insertions(+), 6 deletions(-)

(limited to 'Jellyfin.Server.Implementations')

diff --git a/Jellyfin.Server.Implementations/Item/ItemCountService.cs b/Jellyfin.Server.Implementations/Item/ItemCountService.cs
index c42b5f9581..14b120363f 100644
--- a/Jellyfin.Server.Implementations/Item/ItemCountService.cs
+++ b/Jellyfin.Server.Implementations/Item/ItemCountService.cs
@@ -319,7 +319,7 @@ public class ItemCountService : IItemCountService
     }
 
     /// <inheritdoc/>
-    public Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, Guid? userId)
+    public Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, User? user)
     {
         ArgumentNullException.ThrowIfNull(parentIds);
 
@@ -332,20 +332,32 @@ public class ItemCountService : IItemCountService
 
         var parentIdsArray = parentIds.ToArray();
 
+        var includeVirtual = user is null || user.DisplayMissingEpisodes;
+
         var hierarchicalCounts = dbContext.BaseItems
-            .Where(b => b.ParentId.HasValue)
+            .Where(b => b.ParentId.HasValue && !b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
             .WhereOneOrMany(parentIdsArray, b => b.ParentId!.Value)
             .GroupBy(b => b.ParentId!.Value)
             .Select(g => new { ParentId = g.Key, Count = g.Count() })
             .ToDictionary(x => x.ParentId, x => x.Count);
 
+        // An episode is a child of its season even when it is not stored under one: with a flat
+        // structure ParentId points at the series, so counting by ParentId alone leaves the season
+        // empty and counts its episodes towards the series instead.
+        var seasonCounts = dbContext.BaseItems
+            .Where(b => b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
+            .WhereOneOrMany(parentIdsArray, b => b.SeasonId!.Value)
+            .GroupBy(b => b.SeasonId!.Value)
+            .Select(g => new { SeasonId = g.Key, Count = g.Count() })
+            .ToDictionary(x => x.SeasonId, x => x.Count);
+
         var linkedCounts = dbContext.LinkedChildren
             .WhereOneOrMany(parentIdsArray, lc => lc.ParentId)
             .GroupBy(lc => lc.ParentId)
             .Select(g => new { ParentId = g.Key, Count = g.Count() })
             .ToDictionary(x => x.ParentId, x => x.Count);
 
-        var mergedChildCounts = GetMergedChildCounts(dbContext, parentIdsArray);
+        var mergedChildCounts = GetMergedChildCounts(dbContext, parentIdsArray, includeVirtual);
 
         var result = new Dictionary<Guid, int>();
         foreach (var parentId in parentIds)
@@ -356,7 +368,8 @@ public class ItemCountService : IItemCountService
                 continue;
             }
 
-            var hierarchicalCount = hierarchicalCounts.GetValueOrDefault(parentId, 0);
+            var hierarchicalCount = hierarchicalCounts.GetValueOrDefault(parentId, 0)
+                + seasonCounts.GetValueOrDefault(parentId, 0);
             var linkedCount = linkedCounts.GetValueOrDefault(parentId, 0);
 
             result[parentId] = linkedCount > 0 ? linkedCount : hierarchicalCount;
@@ -365,7 +378,7 @@ public class ItemCountService : IItemCountService
         return result;
     }
 
-    private static Dictionary<Guid, int> GetMergedChildCounts(JellyfinDbContext dbContext, IReadOnlyList<Guid> parentIds)
+    private static Dictionary<Guid, int> GetMergedChildCounts(JellyfinDbContext dbContext, IReadOnlyList<Guid> parentIds, bool includeVirtual)
     {
         var mergedGroups = GetPresentationKeyGroups(dbContext, parentIds)
             .Where(group => group.Value.Count > 1)
@@ -380,10 +393,16 @@ public class ItemCountService : IItemCountService
         var memberIds = mergedGroups.SelectMany(group => group.Value).Distinct().ToArray();
         var children = dbContext.BaseItems
             .AsNoTracking()
-            .Where(b => b.ParentId.HasValue)
+            .Where(b => b.ParentId.HasValue && !b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
             .WhereOneOrMany(memberIds, b => b.ParentId!.Value)
             .Select(b => new { ParentId = b.ParentId!.Value, b.Id, b.PresentationUniqueKey })
             .ToArray()
+            .Concat(dbContext.BaseItems
+                .AsNoTracking()
+                .Where(b => b.SeasonId.HasValue && (includeVirtual || !b.IsVirtualItem))
+                .WhereOneOrMany(memberIds, b => b.SeasonId!.Value)
+                .Select(b => new { ParentId = b.SeasonId!.Value, b.Id, b.PresentationUniqueKey })
+                .ToArray())
             .GroupBy(b => b.ParentId)
             .ToDictionary(
                 g => g.Key,
-- 
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