[Form] ChoiceType: Fix a notice when 'choices' normalizer is replaced

src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php

@@ -291,6 +291,10 @@ class ChoiceType extends AbstractType
                 // forms)
                 $labels = $choiceLabels->labels;
 
+                // The $choiceLabels object is shared with the 'choices' closure.
+                // Since that normalizer can be replaced, labels have to be cleared here.
+                $choiceLabels->labels = array();
+
                 return function ($choice, $key) use ($labels) {
                     return $labels[$key];
                 };

src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php

@@ -14,6 +14,7 @@ namespace Symfony\Component\Form\Tests\Extension\Core\Type;
 use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
 use Symfony\Component\Form\ChoiceList\View\ChoiceView;
 use Symfony\Component\Form\Extension\Core\ChoiceList\ObjectChoiceList;
+use Symfony\Component\Form\Tests\Fixtures\ChoiceSubType;
 
 class ChoiceTypeTest extends \Symfony\Component\Form\Test\TypeTestCase
 {
@@ -1887,4 +1888,30 @@ class ChoiceTypeTest extends \Symfony\Component\Form\Test\TypeTestCase
         // Trigger data initialization
         $form->getViewData();
     }
+
+    /**
+     * This covers the case when:
+     *  - Custom choice type added after a choice type.
+     *  - Custom type is expanded.
+     *  - Custom type replaces 'choices' normalizer with a custom one.
+     * In this case, custom type should not inherit labels from the first added choice type.
+     */
+    public function testCustomChoiceTypeDoesNotInheritChoiceLabels()
+    {
+        $builder = $this->factory->createBuilder();
+        $builder->add('choice', 'choice', array(
+                'choices' => array(
+                    '1' => '1',
+                    '2' => '2',
+                ),
+            )
+        );
+        $builder->add('subChoice', new ChoiceSubType());
+        $form = $builder->getForm();
+
+        // The default 'choices' normalizer would fill the $choiceLabels, but it has been replaced
+        // in the custom choice type, so $choiceLabels->labels remains empty array.
+        // In this case the 'choice_label' closure returns null and not the closure from the first choice type.
+        $this->assertNull($form->get('subChoice')->getConfig()->getOption('choice_label'));
+    }
 }

src/Symfony/Component/Form/Tests/Fixtures/ChoiceSubType.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Tests\Fixtures;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+/**
+ * @author Paráda József <joczy.parada@gmail.com>
+ */ 
+class ChoiceSubType extends AbstractType
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefaults(array('expanded' => true));
+        $resolver->setNormalizer('choices', function () {
+            return array(
+                'attr1' => 'Attribute 1',
+                'attr2' => 'Attribute 2',
+            );
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'sub_choice';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParent()
+    {
+        return 'choice';
+    }
+}