[release/6.0] Revert change to delete dependent when optional FK with…

… cascade delete is set to null Fixes #27174.
dotnet · Jan 19, 2022 · ff3546c · ff3546c
1 parent e7fa151
commit ff3546c
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Showing 2 changed files with 13 additions and 3 deletions.
diff --git a/src/EFCore/ChangeTracking/Internal/NavigationFixer.cs b/src/EFCore/ChangeTracking/Internal/NavigationFixer.cs
@@ -38,6 +38,9 @@ public class NavigationFixer : INavigationFixer
         private readonly bool _useOldBehavior26779
             = AppContext.TryGetSwitch("Microsoft.EntityFrameworkCore.Issue26779", out var enabled) && enabled;
 
+        private readonly bool _useOldBehavior27174
+            = AppContext.TryGetSwitch("Microsoft.EntityFrameworkCore.Issue27174", out var enabled) && enabled;
+
         /// <summary>
         ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
         ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
@@ -504,6 +507,8 @@ var targetDependentEntry
                     }
 
                     if (newValue == null
+                        && (foreignKey.IsRequired
+                            || _useOldBehavior27174)
                         && (foreignKey.DeleteBehavior == DeleteBehavior.Cascade
                             || foreignKey.DeleteBehavior == DeleteBehavior.ClientCascade))
                     {

diff --git a/test/EFCore.Tests/ChangeTracking/ChangeTrackerTest.cs b/test/EFCore.Tests/ChangeTracking/ChangeTrackerTest.cs
@@ -1943,7 +1943,7 @@ public void Dependent_FKs_are_not_nulled_when_principal_is_detached(bool delayCa
             }
         }
 
-        [ConditionalTheory] // Issues #16546 #25360
+        [ConditionalTheory] // Issues #16546 #25360; Change reverted in #27174.
         [InlineData(false, false, false, true, false)]
         [InlineData(true, false, false, true, false)]
         [InlineData(false, true, false, true, false)]
@@ -2043,7 +2043,8 @@ public void Optional_relationship_with_cascade_still_cascades(
                 Assert.Equal(EntityState.Unchanged, context.Entry(attachedContainer).State);
                 Assert.Equal(EntityState.Unchanged, context.Entry(attachedTroduct).State);
 
-                if (delayCascade)
+                if (delayCascade
+                    || (useForeignKey && setProperty))
                 {
                     Assert.Equal(EntityState.Modified, context.Entry(attachedRoom).State);
                 }
@@ -2058,7 +2059,11 @@ public void Optional_relationship_with_cascade_still_cascades(
                 Assert.Equal(3, context.ChangeTracker.Entries().Count());
                 Assert.Equal(EntityState.Unchanged, context.Entry(attachedContainer).State);
                 Assert.Equal(EntityState.Unchanged, context.Entry(attachedTroduct).State);
-                Assert.Equal(EntityState.Deleted, context.Entry(attachedRoom).State);
+
+
+                Assert.Equal(
+                    useForeignKey && setProperty ? EntityState.Modified : EntityState.Deleted,
+                    context.Entry(attachedRoom).State);
 
                 context.SaveChanges();
             }