feature #10569 [Form] Accept interfaces to be passed to "data_class" (webmozart)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[Form] Accept interfaces to be passed to "data_class"

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8669
| License       | MIT
| Doc PR        | -

Commits
-------

b44e07b [Form] Added test case for 4759e062ed004749dbdc2ba31aef0f8ac2601895
7bc7a8a [Form] Accept interfaces to be passed to "data_class"

src/Symfony/Component/Form/CHANGELOG.md

@@ -14,6 +14,7 @@ CHANGELOG
  * errors mapped to unsubmitted forms are discarded now
  * ObjectChoiceList now compares choices by their value, if a value path is
    given
+ * you can now pass interface names in the "data_class" option
 
 2.4.0
 -----

src/Symfony/Component/Form/FormConfigBuilder.php

@@ -192,7 +192,7 @@ class FormConfigBuilder implements FormConfigBuilderInterface
     {
         self::validateName($name);
 
-        if (null !== $dataClass && !class_exists($dataClass)) {
+        if (null !== $dataClass && !class_exists($dataClass) && !interface_exists($dataClass)) {
             throw new InvalidArgumentException(sprintf('The data class "%s" is not a valid class.', $dataClass));
         }
 

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

@@ -146,6 +146,37 @@ class FormTypeTest extends BaseTypeTest
         $this->assertSame(10, $view->vars['attr']['maxlength']);
     }
 
+    public function testDataClassMayBeNull()
+    {
+        $this->factory->createBuilder('form', null, array(
+            'data_class' => null,
+        ));
+    }
+
+    public function testDataClassMayBeAbstractClass()
+    {
+        $this->factory->createBuilder('form', null, array(
+            'data_class' => 'Symfony\Component\Form\Tests\Fixtures\AbstractAuthor',
+        ));
+    }
+
+    public function testDataClassMayBeInterface()
+    {
+        $this->factory->createBuilder('form', null, array(
+            'data_class' => 'Symfony\Component\Form\Tests\Fixtures\AuthorInterface',
+        ));
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Form\Exception\InvalidArgumentException
+     */
+    public function testDataClassMustBeValidClassOrInterface()
+    {
+        $this->factory->createBuilder('form', null, array(
+            'data_class' => 'foobar',
+        ));
+    }
+
     public function testSubmitWithEmptyDataCreatesObjectIfClassAvailable()
     {
         $builder = $this->factory->createBuilder('form', null, array(

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

@@ -0,0 +1,16 @@
+<?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;
+
+abstract class AbstractAuthor
+{
+}

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

@@ -0,0 +1,16 @@
+<?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;
+
+interface AuthorInterface
+{
+}