feat: Add API to control whether Binder converts back to presentation (#12246)

#12132 fixed an old bug, conversion was not done back, which was a regression from Vaadin 7. However since the bug has been present long time, it has become established behavior, thus there may be need to disable conversion back to presentation sometimes, thus this API as added.

1 files changed, 15 insertions, 0 deletions

diff --git a/server/src/test/java/com/vaadin/data/BinderTest.java b/server/src/test/java/com/vaadin/data/BinderTest.java
index 0332572203..98f72e1197 100644
--- a/server/src/test/java/com/vaadin/data/BinderTest.java
+++ b/server/src/test/java/com/vaadin/data/BinderTest.java
@@ -518,6 +518,21 @@ public class BinderTest extends BinderTestBase<Binder<Person>, Person> {
     }
 
     @Test
+    public void withConverter_writeBackValueDisabled() {
+        TextField rentField = new TextField();
+        rentField.setValue("");
+        Binding<Person, BigDecimal> binding = binder.forField(rentField)
+                .withConverter(new EuroConverter(""))
+                .withNullRepresentation(BigDecimal.valueOf(0d))
+                .bind(Person::getRent, Person::setRent);
+        binder.setBean(item);
+        binding.setConvertBackToPresentation(false);
+        rentField.setValue("10");
+
+        assertNotEquals("€ 10.00", rentField.getValue());
+    }
+
+    @Test
     public void beanBinder_nullRepresentationIsNotDisabled() {
         Binder<Person> binder = new Binder<>(Person.class);
         binder.forField(nameField).bind("firstName");