Insert default value for null RowVersion values

Author: mythz

src/ServiceStack.OrmLite/OrmLiteWriteCommandExtensions.cs

@@ -1146,7 +1146,7 @@ internal static object GetRowVersion(this IDbCommand dbCmd, ModelDefinition mode
             if (to is ulong u && modelDef.RowVersion.ColumnType == typeof(byte[]))
                 return BitConverter.GetBytes(u);
 
-            return to;
+            return to ?? modelDef.RowVersion.ColumnType.GetDefaultValue();
         }
 
         internal static string RowVersionSql(this IDbCommand dbCmd, ModelDefinition modelDef, object id)

tests/ServiceStack.OrmLite.Tests/RowVersionTests.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Data;
 using System.Linq;
 using System.Threading.Tasks;
@@ -233,6 +234,32 @@ public async Task Can_Save_new_row_and_retrieve_rowversion_Async()
             var actualRow = await db.SingleByIdAsync<ModelWithRowVersion>(row.Id);
             Assert.That(row.RowVersion, Is.EqualTo(actualRow.RowVersion));
         }
+        
+        public class ModelWithAutoGuidAndRowVersion
+        {
+            [AutoId]
+            public Guid Id { get; set; }
+            public string Name { get; set; }
+            public ulong RowVersion { get; set; }
+        }
+
+        [Test]
+        public void Can_Save_ModelWithAutoGuidAndRowVersion()
+        {
+            db.DropAndCreateTable<ModelWithAutoGuidAndRowVersion>();
+            var row = new ModelWithAutoGuidAndRowVersion { Name = "A" };
+            
+            Assert.That(db.Save(row));
+
+            var dbRow = db.SingleById<ModelWithAutoGuidAndRowVersion>(row.Id);
+            Assert.That(dbRow.Name, Is.EqualTo(row.Name));
+
+            dbRow.Name = "B";
+            db.Save(dbRow);
+
+            dbRow = db.SingleById<ModelWithAutoGuidAndRowVersion>(row.Id);
+            Assert.That(dbRow.Name, Is.EqualTo("B"));
+        }
 
         [Test]
         public void Can_SaveAll_new_rows_and_retrieve_rowversion()