symfony
diff --git a/‎src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
+18-2Lines changed: 18 additions & 2 deletions b/‎src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Form/Extension/Core/Type/RepeatedType.php
+18-2Lines changed: 18 additions & 2 deletions
diff --git a/‎src/Symfony/Component/Form/Tests/Extension/Core/Type/RepeatedTypeTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Form/Tests/Extension/Core/Type/RepeatedTypeTest.php
+38Lines changed: 38 additions & 0 deletions b/‎src/Symfony/Component/Form/Tests/Extension/Core/Type/RepeatedTypeTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Form/Tests/Extension/Core/Type/RepeatedTypeTest.php
+38Lines changed: 38 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Form/Tests/Fixtures/NotMappedType.php
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+23Lines changed: 23 additions & 0 deletions b/‎src/Symfony/Component/Form/Tests/Fixtures/NotMappedType.php
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+23Lines changed: 23 additions & 0 deletions
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Exception\InvalidConfigurationException;
 use Symfony\Component\Form\Extension\Core\DataTransformer\ValueToDuplicatesTransformer;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
@@ -36,8 +37,8 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 $options['first_name'],
                 $options['second_name'],
             ]))
-            ->add($options['first_name'], $options['type'], array_merge($options['options'], $options['first_options']))
-            ->add($options['second_name'], $options['type'], array_merge($options['options'], $options['second_options']))
+            ->add($options['first_name'], $options['type'], $this->mergeOptions($options['options'], $options['first_options']))
+            ->add($options['second_name'], $options['type'], $this->mergeOptions($options['options'], $options['second_options']))
         ;
     }
 
@@ -68,4 +69,19 @@ public function getBlockPrefix()
     {
         return 'repeated';
     }
+
+    private function mergeOptions(array $fieldOptions, array $innerOptions)
+    {
+        $mergedOptions = array_merge($fieldOptions, $innerOptions);
+
+        if (\array_key_exists('mapped', $mergedOptions)) {
+            if (false === $mergedOptions['mapped']) {
+                throw new InvalidConfigurationException('Inner types must be mapped.');
+            }
+        } else {
+            $mergedOptions['mapped'] = true;
+        }
+
+        return $mergedOptions;
+    }
 }
@@ -11,7 +11,9 @@
 
 namespace Symfony\Component\Form\Tests\Extension\Core\Type;
 
+use Symfony\Component\Form\Exception\InvalidConfigurationException;
 use Symfony\Component\Form\Form;
+use Symfony\Component\Form\Tests\Fixtures\NotMappedType;
 
 class RepeatedTypeTest extends BaseTypeTest
 {
@@ -78,6 +80,19 @@ public function testSetRequired()
         $this->assertFalse($form['second']->isRequired());
     }
 
+    public function testMappedOverridesDefault()
+    {
+        $form = $this->factory->create(NotMappedType::class);
+        $this->assertFalse($form->getConfig()->getMapped());
+
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'type' => NotMappedType::class,
+        ]);
+
+        $this->assertTrue($form['first']->getConfig()->getMapped());
+        $this->assertTrue($form['second']->getConfig()->getMapped());
+    }
+
     public function testSetInvalidOptions()
     {
         $this->expectException('Symfony\Component\OptionsResolver\Exception\InvalidOptionsException');
@@ -105,6 +120,29 @@ public function testSetInvalidSecondOptions()
         ]);
     }
 
+    /**
+     * @param string $configurationKey
+     * @dataProvider notMappedConfigurationKeys
+     */
+    public function testNotMappedInner($configurationKey)
+    {
+        $this->expectException(InvalidConfigurationException::class);
+        $this->expectExceptionMessage('Inner types must be mapped');
+
+        $this->factory->create(static::TESTED_TYPE, null, [
+            'type' => TextTypeTest::TESTED_TYPE,
+            $configurationKey => ['mapped' => false],
+        ]);
+    }
+
+    public function notMappedConfigurationKeys()
+    {
+        return [
+            ['first_options'],
+            ['second_options'],
+        ];
+    }
+
     public function testSetErrorBubblingToTrue()
     {
         $form = $this->factory->create(static::TESTED_TYPE, null, [
 
@@ -0,0 +1,23 @@
+<?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;
+
+class NotMappedType extends AbstractType
+{
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefault('mapped', false);
+    }
+}