Avoid updating unchanged properties

Fixes #30601
dotnet · Apr 6, 2023 · 66fa9e6 · 66fa9e6
1 parent 5d71afe
commit 66fa9e6
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diff --git a/src/EFCore.Relational/Update/Internal/CommandBatchPreparer.cs b/src/EFCore.Relational/Update/Internal/CommandBatchPreparer.cs
@@ -17,6 +17,9 @@ public class CommandBatchPreparer : ICommandBatchPreparer
     private static readonly bool QuirkEnabled29647
         = AppContext.TryGetSwitch("Microsoft.EntityFrameworkCore.Issue29647", out var enabled) && enabled;
 
+    private static readonly bool QuirkEnabled30601
+        = AppContext.TryGetSwitch("Microsoft.EntityFrameworkCore.Issue30601", out var enabled) && enabled;
+
     private readonly int _minBatchSize;
     private readonly bool _sensitiveLoggingEnabled;
     private readonly bool _detailedErrorsEnabled;
@@ -983,6 +986,10 @@ private static bool IsModified(IReadOnlyList<IColumn> columns, IReadOnlyModifica
                             }
 
                             originalValue ??= entry.GetOriginalProviderValue(property);
+                            if (!QuirkEnabled30601)
+                            {
+                                currentValue ??= entry.GetCurrentProviderValue(property);
+                            }
                             break;
                     }
 

diff --git a/test/EFCore.Relational.Specification.Tests/UpdatesRelationalTestBase.cs b/test/EFCore.Relational.Specification.Tests/UpdatesRelationalTestBase.cs
@@ -180,6 +180,44 @@ public virtual void Swap_filtered_unique_index_values()
             });
     }
 
+    [ConditionalFact]
+    public virtual void Update_non_indexed_values()
+    {
+        var productId1 = new Guid("984ade3c-2f7b-4651-a351-642e92ab7146");
+        var productId2 = new Guid("0edc9136-7eed-463b-9b97-bdb9648ab877");
+
+        ExecuteWithStrategyInTransaction(
+            context =>
+            {
+                var product1 = context.Products.Find(productId1)!;
+                var product2 = context.Products.Find(productId2)!;
+
+                product2.Price = product1.Price;
+
+                context.SaveChanges();
+            },
+            context =>
+            {
+                var product1 = new Product { Id = productId1, Name = "", Price = 1.49M };
+                var product2 = new Product { Id = productId2, Name = "", Price = 1.49M };
+
+                context.Attach(product1).Property(p => p.DependentId).IsModified = true;
+                context.Attach(product2).Property(p => p.DependentId).IsModified = true;
+
+                context.SaveChanges();
+            },
+            context =>
+            {
+                var product1 = context.Products.Find(productId1)!;
+                var product2 = context.Products.Find(productId2)!;
+
+                Assert.Equal(1.49M, product1.Price);
+                Assert.Null(product1.DependentId);
+                Assert.Equal(1.49M, product2.Price);
+                Assert.Null(product2.DependentId);
+            });
+    }
+
     [ConditionalFact]
     public abstract void Identifiers_are_generated_correctly();