Merge remote-tracking branch 'upstream/master' into fix-byname-queries

Jellyfin.Server.Implementations/Item/BaseItemRepository.QueryBuilding.cs

@@ -35,11 +35,40 @@ public sealed partial class BaseItemRepository
     {
         dbQuery = TranslateQuery(dbQuery, context, filter);
         dbQuery = ApplyGroupingFilter(context, dbQuery, filter);
+        dbQuery = ApplyAdjacencyFilter(context, dbQuery, filter);
         dbQuery = ApplyQueryPaging(dbQuery, filter);
         dbQuery = ApplyNavigations(dbQuery, filter);
         return dbQuery;
     }
 
+    /// <summary>
+    /// Trims an ordered query down to the AdjacentTo item and its immediate neighbours.
+    /// </summary>
+    private IQueryable<BaseItemEntity> ApplyAdjacencyFilter(JellyfinDbContext context, IQueryable<BaseItemEntity> dbQuery, InternalItemsQuery filter)
+    {
+        if (filter.AdjacentTo.IsNullOrEmpty())
+        {
+            return dbQuery;
+        }
+
+        // Adjacency is relative to the result set and the order the query asked for, so the ids have
+        // to be read back in that order.
+        var orderedIds = dbQuery.Select(e => e.Id).ToList();
+        var index = orderedIds.IndexOf(filter.AdjacentTo.Value);
+        if (index < 0)
+        {
+            // The item isn't part of this result set, so it has no neighbours in it either.
+            return dbQuery.Take(0);
+        }
+
+        var start = Math.Max(index - 1, 0);
+        var adjacentIds = orderedIds.GetRange(start, Math.Min(index + 2, orderedIds.Count) - start);
+
+        var adjacentQuery = context.BaseItems.AsNoTracking().AsSingleQuery().Where(e => adjacentIds.Contains(e.Id));
+
+        return ApplyOrder(adjacentQuery, filter, context);
+    }
+
     private IQueryable<BaseItemEntity> ApplyQueryPaging(IQueryable<BaseItemEntity> dbQuery, InternalItemsQuery filter)
     {
         if (filter.Limit.HasValue || filter.StartIndex.HasValue)
@@ -244,8 +273,8 @@ public sealed partial class BaseItemRepository
             dbQuery = dbQuery.Include(e => e.Images);
         }
 
-        // Include LinkedChildEntities for container types and videos that use them
-        // (BoxSet, Playlist, CollectionFolder for manual linking; Video, Movie for alternate versions).
+        // Include LinkedChildEntities for container types and videos that use them (BoxSet, Playlist,
+        // CollectionFolder for manual linking; every video type for alternate versions).
         // When IncludeItemTypes is empty (any type may be returned), always include them to ensure
         // LinkedChildren are loaded before items are saved back, preventing accidental deletion.
         var linkedChildTypes = new[]
@@ -254,7 +283,10 @@ public sealed partial class BaseItemRepository
             BaseItemKind.Playlist,
             BaseItemKind.CollectionFolder,
             BaseItemKind.Video,
-            BaseItemKind.Movie
+            BaseItemKind.Movie,
+            BaseItemKind.Episode,
+            BaseItemKind.MusicVideo,
+            BaseItemKind.Trailer
         };
         if (filter.IncludeItemTypes.Length == 0 || filter.IncludeItemTypes.Any(linkedChildTypes.Contains))
         {
@@ -390,7 +422,8 @@ public sealed partial class BaseItemRepository
 
         var baseQuery = context.BaseItems
             .AsNoTracking()
-            .Where(b => allDescendantIds.Contains(b.Id) && !b.IsFolder && !b.IsVirtualItem);
+            .Where(b => allDescendantIds.Contains(b.Id))
+            .Where(DescendantQueryHelper.IsCountableLeaf);
 
         return ApplyAccessFiltering(context, baseQuery, filter);
     }
@@ -628,7 +661,7 @@ public sealed partial class BaseItemRepository
 
         var leafItems = context.BaseItems
             .AsNoTracking()
-            .Where(e => !e.IsFolder && !e.IsVirtualItem);
+            .Where(DescendantQueryHelper.IsCountableLeaf);
 
         return ApplyAccessFiltering(context, leafItems, new InternalItemsQuery(user) { IncludeOwnedItems = includeOwnedItems });
     }