JTASK-863: convert between string and []byte on Option[T].Scan

options.go

@@ -164,6 +164,16 @@ func (o *Option[T]) Scan(src any) error {
 	if err != nil {
 		return fmt.Errorf("Option[%T].Scan: failed to convert value from SQL driver: %w", o.value, err)
 	}
+
+	// Convert between string and []byte if needed
+	dstType := reflect.TypeOf(o.value)
+	srcType := reflect.TypeOf(av)
+	if isByteSlice(srcType) && dstType.Kind() == reflect.String {
+		av = string(av.([]byte))
+	} else if srcType.Kind() == reflect.String && isByteSlice(dstType) {
+		av = []byte(av.(string))
+	}
+
 	v, ok := av.(T)
 	if !ok {
 		return fmt.Errorf("Option[%T].Scan: failed to convert value %#v to type %T", o.value, av, o.value)
@@ -172,6 +182,10 @@ func (o *Option[T]) Scan(src any) error {
 	return nil
 }
 
+func isByteSlice(t reflect.Type) bool {
+	return t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8
+}
+
 // Equal returns true if the two options are equal.
 // Equality of the wrapped values is determined by [reflect.DeepEqual].
 //

options_test.go

@@ -232,6 +232,25 @@ func TestSQLScan(t *testing.T) {
 		t.Fatal(err)
 	}
 	assertEqual(t, opt3, options.New[time.Time](ts))
+
+	byteString := []byte("hello")
+	var opt4 options.Option[string]
+	if err := opt4.Scan(byteString); err != nil {
+		t.Fatal(err)
+	}
+	assertEqual(t, opt4, options.New[string]("hello"))
+
+	var opt5 options.Option[[]byte]
+	if err := opt5.Scan("hello"); err != nil {
+		t.Fatal(err)
+	}
+	assertDeepEqual(t, opt5, options.New[[]byte]([]byte("hello")))
+
+	var opt6 options.Option[string]
+	if err := opt6.Scan(nil); err != nil {
+		t.Fatal(err)
+	}
+	assertEqual(t, opt6, options.None[string]())
 }
 
 func TestEqual(t *testing.T) {