bug symfony#54723 [Form] read form values using the chain data accessor (xabbuh)

This PR was merged into the 5.4 branch.

Discussion
----------

[Form] read form values using the chain data accessor

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#48167
| License       | MIT

Commits
-------

e0d97f8 read form values using the chain data accessor

Author: xabbuh

src/Symfony/Component/Form/Extension/Core/DataAccessor/PropertyPathAccessor.php

@@ -12,7 +12,9 @@
 namespace Symfony\Component\Form\Extension\Core\DataAccessor;
 
 use Symfony\Component\Form\DataAccessorInterface;
+use Symfony\Component\Form\DataMapperInterface;
 use Symfony\Component\Form\Exception\AccessException;
+use Symfony\Component\Form\Extension\Core\DataMapper\DataMapper;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\PropertyAccess\Exception\AccessException as PropertyAccessException;
 use Symfony\Component\PropertyAccess\Exception\NoSuchIndexException;
@@ -57,15 +59,25 @@ public function setValue(&$data, $propertyValue, FormInterface $form): void
             throw new AccessException('Unable to write the given value as no property path is defined.');
         }
 
+        $getValue = function () use ($data, $form, $propertyPath) {
+            $dataMapper = $this->getDataMapper($form);
+
+            if ($dataMapper instanceof DataMapper && null !== $dataAccessor = $dataMapper->getDataAccessor()) {
+                return $dataAccessor->getValue($data, $form);
+            }
+
+            return $this->getPropertyValue($data, $propertyPath);
+        };
+
         // If the field is of type DateTimeInterface and the data is the same skip the update to
         // keep the original object hash
-        if ($propertyValue instanceof \DateTimeInterface && $propertyValue == $this->getPropertyValue($data, $propertyPath)) {
+        if ($propertyValue instanceof \DateTimeInterface && $propertyValue == $getValue()) {
             return;
         }
 
         // If the data is identical to the value in $data, we are
         // dealing with a reference
-        if (!\is_object($data) || !$form->getConfig()->getByReference() || $propertyValue !== $this->getPropertyValue($data, $propertyPath)) {
+        if (!\is_object($data) || !$form->getConfig()->getByReference() || $propertyValue !== $getValue()) {
             $this->propertyAccessor->setValue($data, $propertyPath, $propertyValue);
         }
     }
@@ -105,4 +117,13 @@ private function getPropertyValue($data, PropertyPathInterface $propertyPath)
             return null;
         }
     }
+
+    private function getDataMapper(FormInterface $form): ?DataMapperInterface
+    {
+        do {
+            $dataMapper = $form->getConfig()->getDataMapper();
+        } while (null === $dataMapper && null !== $form = $form->getParent());
+
+        return $dataMapper;
+    }
 }

src/Symfony/Component/Form/Extension/Core/DataMapper/DataMapper.php

@@ -88,4 +88,12 @@ public function mapFormsToData(iterable $forms, &$data): void
             }
         }
     }
+
+    /**
+     * @internal
+     */
+    public function getDataAccessor(): DataAccessorInterface
+    {
+        return $this->dataAccessor;
+    }
 }

src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/DataMapperTest.php

@@ -17,6 +17,8 @@
 use Symfony\Component\Form\Extension\Core\DataAccessor\PropertyPathAccessor;
 use Symfony\Component\Form\Extension\Core\DataMapper\DataMapper;
 use Symfony\Component\Form\Extension\Core\Type\DateType;
+use Symfony\Component\Form\Extension\Core\Type\FormType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormConfigBuilder;
 use Symfony\Component\Form\FormFactoryBuilder;
@@ -419,6 +421,25 @@ public function testMapFormsToDataMapsDateTimeInstanceToArrayIfNotSetBefore()
 
         $this->assertEquals(['date' => new \DateTime('2022-08-04', new \DateTimeZone('UTC'))], $form->getData());
     }
+
+    public function testMapFormToDataWithOnlyGetterConfigured()
+    {
+        $person = new DummyPerson('foo');
+        $form = (new FormFactoryBuilder())
+            ->getFormFactory()
+            ->createBuilder(FormType::class, $person)
+            ->add('name', TextType::class, [
+                'getter' => function (DummyPerson $person) {
+                    return $person->myName();
+                },
+            ])
+            ->getForm();
+        $form->submit([
+            'name' => 'bar',
+        ]);
+
+        $this->assertSame('bar', $person->myName());
+    }
 }
 
 class SubmittedForm extends Form
@@ -455,4 +476,9 @@ public function rename($name): void
     {
         $this->name = $name;
     }
+
+    public function setName($name): void
+    {
+        $this->name = $name;
+    }
 }