symfony
diff --git a/‎src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
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+9-4Lines changed: 9 additions & 4 deletions b/‎src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
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+9-4Lines changed: 9 additions & 4 deletions
diff --git a/‎src/Symfony/Bundle/FrameworkBundle/Controller/ControllerTrait.php
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+25Lines changed: 25 additions & 0 deletions b/‎src/Symfony/Bundle/FrameworkBundle/Controller/ControllerTrait.php
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+25Lines changed: 25 additions & 0 deletions
diff --git a/‎src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php
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+77Lines changed: 77 additions & 0 deletions b/‎src/Symfony/Bundle/FrameworkBundle/Tests/Controller/ControllerTraitTest.php
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+77Lines changed: 77 additions & 0 deletions
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+4.1.0
+-----
+
+ * Added `ControllerTrait::isFormValid`
+
 4.0.0
 -----
 
@@ -39,17 +44,17 @@ CHANGELOG
  * Deprecated the `KernelTestCase::getPhpUnitXmlDir()` and `KernelTestCase::getPhpUnitCliConfigArgument()` methods.
  * Deprecated `AddCacheClearerPass`, use tagged iterator arguments instead.
  * Deprecated `AddCacheWarmerPass`, use tagged iterator arguments instead.
- * Deprecated `TranslationDumperPass`, use 
+ * Deprecated `TranslationDumperPass`, use
    `Symfony\Component\Translation\DependencyInjection\TranslationDumperPass` instead
- * Deprecated `TranslationExtractorPass`, use 
+ * Deprecated `TranslationExtractorPass`, use
    `Symfony\Component\Translation\DependencyInjection\TranslationExtractorPass` instead
- * Deprecated `TranslatorPass`, use 
+ * Deprecated `TranslatorPass`, use
    `Symfony\Component\Translation\DependencyInjection\TranslatorPass` instead
  * Added `command` attribute to the `console.command` tag which takes the command
    name as value, using it makes the command lazy
  * Added `cache:pool:prune` command to allow manual stale cache item pruning of supported PSR-6 and PSR-16 cache pool
    implementations
- * Deprecated `Symfony\Bundle\FrameworkBundle\Translation\TranslationLoader`, use 
+ * Deprecated `Symfony\Bundle\FrameworkBundle\Translation\TranslationLoader`, use
    `Symfony\Component\Translation\Reader\TranslationReader` instead
  * Deprecated `translation.loader` service, use `translation.reader` instead
  * `AssetsInstallCommand::__construct()` now takes an instance of
 
@@ -14,6 +14,7 @@
 use Psr\Container\ContainerInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
@@ -25,6 +26,7 @@
 use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Doctrine\Bundle\DoctrineBundle\Registry;
 
@@ -404,6 +406,29 @@ protected function createFormBuilder($data = null, array $options = array())
         return $this->container->get('form.factory')->createBuilder(FormType::class, $data, $options);
     }
 
+    /**
+     * Handles request and check form validity
+     *
+     * @param FormInterface $form    The form to validate
+     * @param Request|null  $request The request
+     *
+     * @return bool
+     *
+     * @final since version 4.1
+     */
+    protected function isFormValid(FormInterface $form, Request $request = null)
+    {
+        if (!$request) {
+            $request = $this->container->get('request_stack')->getCurrentRequest();
+        }
+
+        if (!$request) {
+            throw new \LogicException('You must pass a request as second argument because the request stack was empty.');
+        }
+
+        return $form->handleRequest($request)->isSubmitted() && $form->isValid();
+    }
+
     /**
      * Shortcut to return the Doctrine Registry service.
      *
 
@@ -13,6 +13,7 @@
 
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\JsonResponse;
@@ -517,6 +518,77 @@ public function testCreateFormBuilder()
         $this->assertEquals($formBuilder, $controller->createFormBuilder('foo'));
     }
 
+    public function testIsFormValidWhenInvalid()
+    {
+        $requestStack = new RequestStack();
+        $requestStack->push($request = new Request());
+
+        $container = new Container();
+        $container->set('request_stack', $requestStack);
+
+        $controller = $this->createController();
+        $controller->setContainer($container);
+
+        $form = $this->getMockBuilder('Symfony\Component\Form\FormInterface')->getMock();
+        $form
+            ->expects($this->once())
+            ->method('handleRequest')
+            ->with($request)
+            ->willReturn($form)
+        ;
+
+        $this->assertFalse($controller->isFormValid($form));
+    }
+
+    public function testIsFormValidWhenValid()
+    {
+        $requestStack = new RequestStack();
+        $requestStack->push($request = new Request());
+
+        $container = new Container();
+        $container->set('request_stack', $requestStack);
+
+        $controller = $this->createController();
+        $controller->setContainer($container);
+
+        $form = $this->getMockBuilder('Symfony\Component\Form\FormInterface')->getMock();
+        $form
+            ->expects($this->once())
+            ->method('handleRequest')
+            ->with($request)
+            ->willReturn($form)
+        ;
+        $form
+            ->expects($this->once())
+            ->method('isSubmitted')
+            ->willReturn(true)
+        ;
+        $form
+            ->expects($this->once())
+            ->method('isValid')
+            ->willReturn(true)
+        ;
+
+        $this->assertTrue($controller->isFormValid($form));
+    }
+
+    /**
+     * @expectedException \LogicException
+     * @expectedExceptionMessage You must pass a request as second argument because the request stack was empty.
+     */
+    public function testIsFormValidWhenRequestStackIsEmpty()
+    {
+        $container = new Container();
+        $container->set('request_stack', new RequestStack());
+
+        $controller = $this->createController();
+        $controller->setContainer($container);
+
+        $form = $this->getMockBuilder('Symfony\Component\Form\FormInterface')->getMock();
+
+        $this->assertTrue($controller->isFormValid($form));
+    }
+
     public function testGetDoctrine()
     {
         $doctrine = $this->getMockBuilder('Doctrine\Common\Persistence\ManagerRegistry')->getMock();
@@ -623,6 +695,11 @@ public function createFormBuilder($data = null, array $options = array())
         return parent::createFormBuilder($data, $options);
     }
 
+    public function isFormValid(FormInterface $form, Request $request = null)
+    {
+        return parent::isFormValid($form, $request);
+    }
+
     public function getDoctrine()
     {
         return parent::getDoctrine();