feat: keep result as nil when record not found & dest is nil

callbacks.go

@@ -115,7 +115,8 @@ func (p *processor) Execute(db *DB) *DB {
 	if stmt.Dest != nil {
 		stmt.ReflectValue = reflect.ValueOf(stmt.Dest)
 		for stmt.ReflectValue.Kind() == reflect.Ptr {
-			if stmt.ReflectValue.IsNil() && stmt.ReflectValue.CanAddr() {
+			stmt.DestIsNil = stmt.ReflectValue.IsNil()
+			if stmt.DestIsNil && stmt.ReflectValue.CanAddr() {
 				stmt.ReflectValue.Set(reflect.New(stmt.ReflectValue.Type().Elem()))
 			}
 

scan.go

@@ -342,5 +342,9 @@ func Scan(rows Rows, db *DB, mode ScanMode) {
 
 	if db.RowsAffected == 0 && db.Statement.RaiseErrorOnNotFound && db.Error == nil {
 		db.AddError(ErrRecordNotFound)
+		if db.Statement.DestIsNil {
+			// reset dest to nil
+			reflect.ValueOf(db.Statement.Dest).Elem().Set(reflect.Zero(reflect.ValueOf(db.Statement.Dest).Elem().Type()))
+		}
 	}
 }

statement.go

@@ -26,6 +26,7 @@ type Statement struct {
 	Model                interface{}
 	Unscoped             bool
 	Dest                 interface{}
+	DestIsNil            bool
 	ReflectValue         reflect.Value
 	Clauses              map[string]clause.Clause
 	BuildClauses         []string

tests/query_test.go

@@ -206,6 +206,14 @@ func TestFind(t *testing.T) {
 		}
 	})
 
+	t.Run("KeepResultAsNil", func(t *testing.T) {
+		var first *User
+		if err := DB.Where("name = ?", "find not found").First(&first).Error; err != nil {
+			AssertEqual(t, err, gorm.ErrRecordNotFound)
+			AssertEqual(t, first, nil)
+		}
+	})
+
 	var models []User
 	if err := DB.Where("name in (?)", []string{"find"}).Find(&models).Error; err != nil || len(models) != 3 {
 		t.Errorf("errors happened when query find with in clause: %v, length: %v", err, len(models))