bug symfony#18317 [Form] fix "prototype" not required when parent form is not required (HeahDude)

This PR was merged into the 2.3 branch.

Discussion
----------

[Form] fix "prototype" not required when parent form is not required

| Q             | A
| ------------- | ---
| Branch?       | 2.3+
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#18311
| License       | MIT
| Doc PR        | ~

Commits
-------

7df9ca2 [Form] fix "prototype" not required when parent form is not required

Author: fabpot

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

@@ -55,7 +55,8 @@ public function buildView(FormView $view, FormInterface $form, array $options)
         ));
 
         if ($form->getConfig()->hasAttribute('prototype')) {
-            $view->vars['prototype'] = $form->getConfig()->getAttribute('prototype')->createView($view);
+            $prototype = $form->getConfig()->getAttribute('prototype');
+            $view->vars['prototype'] = $prototype->setParent($form)->createView($view);
         }
     }
 

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

@@ -221,4 +221,46 @@ public function testPrototypeSetNotRequired()
         $this->assertFalse($form->createView()->vars['required'], 'collection is not required');
         $this->assertFalse($form->createView()->vars['prototype']->vars['required'], '"prototype" should not be required');
     }
+
+    public function testPrototypeSetNotRequiredIfParentNotRequired()
+    {
+        $child = $this->factory->create('collection', array(), array(
+            'type' => 'file',
+            'allow_add' => true,
+            'prototype' => true,
+            'prototype_name' => '__test__',
+        ));
+
+        $parent = $this->factory->create('form', array(), array(
+            'required' => false,
+        ));
+
+        $child->setParent($parent);
+        $this->assertFalse($parent->createView()->vars['required'], 'Parent is not required');
+        $this->assertFalse($child->createView()->vars['required'], 'Child is not required');
+        $this->assertFalse($child->createView()->vars['prototype']->vars['required'], '"Prototype" should not be required');
+    }
+
+    public function testPrototypeNotOverrideRequiredByEntryOptionsInFavorOfParent()
+    {
+        $child = $this->factory->create('collection', array(), array(
+            'type' => 'file',
+            'allow_add' => true,
+            'prototype' => true,
+            'prototype_name' => '__test__',
+            'options' => array(
+                'required' => true,
+            ),
+        ));
+
+        $parent = $this->factory->create('form', array(), array(
+            'required' => false,
+        ));
+
+        $child->setParent($parent);
+
+        $this->assertFalse($parent->createView()->vars['required'], 'Parent is not required');
+        $this->assertFalse($child->createView()->vars['required'], 'Child is not required');
+        $this->assertFalse($child->createView()->vars['prototype']->vars['required'], '"Prototype" should not be required');
+    }
 }