[release/10.0] Fix TableSharingConcurrencyTokenConvention to skip JSON-mapped entities (#37286)

Fixes #37274

Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

Author: Copilot

src/EFCore.Relational/Metadata/Conventions/TableSharingConcurrencyTokenConvention.cs

@@ -78,6 +78,13 @@ public virtual void ProcessModelFinalizing(
                 {
                     Check.DebugAssert(readOnlyProperties.Count != 0, $"No properties mapped to column '{concurrencyColumnName}'");
 
+                    // JSON-mapped entities don't have column names for their properties,
+                    // so we skip them as they participate in the owner's concurrency token
+                    if (entityType.IsMappedToJson())
+                    {
+                        continue;
+                    }
+
                     var foundMappedProperty = !IsConcurrencyTokenMissing(readOnlyProperties, entityType, mappedTypes)
                         || entityType.GetProperties()
                             .Any(p => p.GetColumnName(table) == concurrencyColumnName);

test/EFCore.Relational.Tests/Metadata/Conventions/TableSharingConcurrencyTokenConventionTest.cs

@@ -202,6 +202,55 @@ public virtual void Concurrency_token_property_is_not_created_on_the_sharing_whe
         Assert.All(animalEntityType.GetProperties(), p => Assert.NotEqual(typeof(byte[]), p.ClrType));
     }
 
+    [ConditionalFact]
+    public virtual void Missing_concurrency_token_property_is_not_created_for_json_mapped_entity()
+    {
+        var modelBuilder = GetModelBuilder();
+        modelBuilder.Entity<BaseEntity>(b =>
+        {
+            b.HasKey(e => e.Id);
+            b.Property(e => e.RowVersion).IsRowVersion().IsConcurrencyToken();
+            b.Property(e => e.Name).HasMaxLength(100).IsRequired();
+            b.HasDiscriminator<string>("Type")
+                .HasValue<DerivedEntity>(nameof(DerivedEntity));
+        });
+        modelBuilder.Entity<DerivedEntity>(b =>
+        {
+            b.OwnsOne(x => x.Owned, ob =>
+            {
+                ob.ToJson();
+                ob.Property(o => o.Description).HasMaxLength(200).IsRequired();
+            });
+        });
+
+        var model = modelBuilder.Model;
+        model.FinalizeModel();
+
+        var ownedEntity = model.FindEntityType(typeof(OwnedEntity));
+        Assert.NotNull(ownedEntity);
+        Assert.True(ownedEntity.IsMappedToJson());
+        Assert.DoesNotContain(
+            ownedEntity.GetProperties(),
+            p => p.Name.StartsWith("_TableSharingConcurrencyTokenConvention"));
+    }
+
+    protected abstract class BaseEntity
+    {
+        public int Id { get; set; }
+        public string Name { get; set; } = string.Empty;
+        public long RowVersion { get; set; }
+    }
+
+    protected class DerivedEntity : BaseEntity
+    {
+        public OwnedEntity Owned { get; set; } = new();
+    }
+
+    protected class OwnedEntity
+    {
+        public string Description { get; set; } = "Any";
+    }
+
     protected class Animal
     {
         public int Id { get; set; }