[Form] Individual rows of CollectionType cannot be styled anymore for performance reasons

UPGRADE-2.1.md

@@ -576,6 +576,30 @@
     {% endblock %}
     ````
 
+  * Custom styling of individual rows of a collection form has been removed for
+    performance reasons. Instead, all rows now have the same block name, where
+    the word "entry" replaces the previous occurence of the row index.
+
+    Before:
+
+    ```
+    {% block _author_tags_0_label %}
+        {# ... #}
+    {% endblock %}
+
+    {% block _author_tags_1_label %}
+        {# ... #}
+    {% endblock %}
+    ```
+
+    After:
+
+    ```
+    {% block _author_tags_entry_label %}
+        {# ... #}
+    {% endblock %}
+    ```
+
 #### Other BC Breaks
 
   * The order of the first two arguments of the methods `createNamed` and

src/Symfony/Bridge/Twig/Extension/FormExtension.php

@@ -245,7 +245,7 @@ class FormExtension extends \Twig_Extension
             $this->varStack[$rendering]['variables'] = array_replace_recursive($this->varStack[$rendering]['variables'], $variables);
         } else {
             $types = $view->getVar('types');
-            $types[] = $custom;
+            $types[] = $view->getVar('full_block_name');
             $typeIndex = count($types) - 1;
             $this->varStack[$rendering] = array(
                 'variables' => array_replace_recursive($view->getVars(), $variables),

src/Symfony/Bridge/Twig/Tests/Extension/custom_widgets.html.twig

@@ -1,5 +1,16 @@
 {% block _text_id_widget %}
-<div id="container">
-    {{ form_widget(form) }}
-</div>
+{% spaceless %}
+    <div id="container">
+        {{ form_widget(form) }}
+    </div>
+{% endspaceless %}
 {% endblock _text_id_widget %}
+
+{% block _name_entry_label %}
+{% spaceless %}
+    {% if label is empty %}
+        {% set label = name|humanize %}
+    {% endif %}
+    <label>Custom label: {{ label|trans({}, translation_domain) }}</label>
+{% endspaceless %}
+{% endblock _name_entry_label %}

src/Symfony/Bundle/FrameworkBundle/Templating/Helper/FormHelper.php

@@ -246,7 +246,7 @@ class FormHelper extends Helper
             $variables = array_replace_recursive($this->varStack[$rendering]['variables'], $variables);
         } else {
             $types = $view->getVar('types');
-            $types[] = $custom;
+            $types[] = $view->getVar('full_block_name');
             $typeIndex = count($types) - 1;
             $variables = array_replace_recursive($view->getVars(), $variables);
             $this->varStack[$rendering]['types'] = $types;

src/Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/Resources/Custom/_name_entry_label.html.php

@@ -0,0 +1,2 @@
+<?php if (!$label) { $label = $view['form']->humanize($name); } ?>
+<label>Custom label: <?php echo $view->escape($view['translator']->trans($label, array(), $translation_domain)) ?></label>

src/Symfony/Component/Form/CHANGELOG.md

@@ -170,3 +170,5 @@ CHANGELOG
    * `getExtensions`
    * `setExtensions`
  * ChoiceType now caches its created choice lists to improve performance
+ * [BC BREAK] Rows of a collection field cannot be themed individually anymore. All rows in the collection
+   field now have the same block names, which contains "entry" where it previously contained the row index.

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

@@ -16,6 +16,7 @@ use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormViewInterface;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\Extension\Core\EventListener\ResizeFormListener;
+use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolverInterface;
 
 class CollectionType extends AbstractType
@@ -73,6 +74,12 @@ class CollectionType extends AbstractType
      */
     public function setDefaultOptions(OptionsResolverInterface $resolver)
     {
+        $optionsFilter = function (Options $options, $value) {
+            $value['block_name'] = 'entry';
+
+            return $value;
+        };
+
         $resolver->setDefaults(array(
             'allow_add'      => false,
             'allow_delete'   => false,
@@ -81,6 +88,10 @@ class CollectionType extends AbstractType
             'type'           => 'text',
             'options'        => array(),
         ));
+
+        $resolver->setFilters(array(
+            'options' => $optionsFilter,
+        ));
     }
 
     /**

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

@@ -59,6 +59,7 @@ class FormType extends AbstractType
     public function buildView(FormViewInterface $view, FormInterface $form, array $options)
     {
         $name = $form->getName();
+        $blockName = $options['block_name'] ?: $form->getName();
         $readOnly = $options['read_only'];
         $translationDomain = $options['translation_domain'];
 
@@ -67,23 +68,30 @@ class FormType extends AbstractType
                 throw new FormException('Form node with empty name can be used only as root form node.');
             }
 
-            if ('' !== ($parentFullName = $view->getParent()->getVar('full_name'))) {
-                $id = sprintf('%s_%s', $view->getParent()->getVar('id'), $name);
+            $parentView = $view->getParent();
+
+            if ('' !== ($parentFullName = $parentView->getVar('full_name'))) {
+                $id = sprintf('%s_%s', $parentView->getVar('id'), $name);
                 $fullName = sprintf('%s[%s]', $parentFullName, $name);
+                $fullBlockName = sprintf('%s_%s', $parentView->getVar('full_block_name'), $blockName);
             } else {
                 $id = $name;
                 $fullName = $name;
+                $fullBlockName = '_' . $blockName;
             }
 
-            // Complex fields are read-only if themselves or their parent is.
-            $readOnly = $readOnly || $view->getParent()->getVar('read_only');
+            // Complex fields are read-only if they themselves or their parents are.
+            if (!$readOnly) {
+                $readOnly = $parentView->getVar('read_only');
+            }
 
             if (!$translationDomain) {
-                $translationDomain = $view->getParent()->getVar('translation_domain');
+                $translationDomain = $parentView->getVar('translation_domain');
             }
         } else {
             $id = $name;
             $fullName = $name;
+            $fullBlockName = '_' . $blockName;
 
             // Strip leading underscores and digits. These are allowed in
             // form names, but not in HTML4 ID attributes.
@@ -105,6 +113,7 @@ class FormType extends AbstractType
             'id'                 => $id,
             'name'               => $name,
             'full_name'          => $fullName,
+            'full_block_name'    => $fullBlockName,
             'read_only'          => $readOnly,
             'errors'             => $form->getErrors(),
             'valid'              => $form->isBound() ? $form->isValid() : true,
@@ -177,7 +186,14 @@ class FormType extends AbstractType
             return false !== $options['property_path'];
         };
 
+        // If data is given, the form is locked to that data
+        // (independent of its value)
+        $resolver->setOptional(array(
+            'data',
+        ));
+
         $resolver->setDefaults(array(
+            'block_name'         => null,
             'data_class'         => $dataClass,
             'empty_data'         => $emptyData,
             'trim'               => true,
@@ -198,12 +214,6 @@ class FormType extends AbstractType
             'translation_domain' => null,
         ));
 
-        // If data is given, the form is locked to that data
-        // (independent of its value)
-        $resolver->setOptional(array(
-            'data',
-        ));
-
         $resolver->setAllowedTypes(array(
             'attr'       => 'array',
             'label_attr' => 'array',

src/Symfony/Component/Form/Tests/AbstractDivLayoutTest.php

@@ -557,6 +557,27 @@ abstract class AbstractDivLayoutTest extends AbstractLayoutTest
             ]
         /following-sibling::input[@type="hidden"]
     ]
+'
+        );
+    }
+
+    /**
+     * The block "_name_child_label" should be overridden in the theme of the
+     * implemented driver.
+     */
+    public function testCollectionRowWithCustomBlock()
+    {
+        $collection = array('one', 'two', 'three');
+        $form = $this->factory->createNamedBuilder('name', 'collection', $collection)
+            ->getForm();
+
+        $this->assertWidgetMatchesXpath($form->createView(), array(),
+'/div
+    [
+        ./div[./label[.="Custom label: [trans]0[/trans]"]]
+        /following-sibling::div[./label[.="Custom label: [trans]1[/trans]"]]
+        /following-sibling::div[./label[.="Custom label: [trans]2[/trans]"]]
+    ]
 '
         );
     }

src/Symfony/Component/Form/Tests/AbstractTableLayoutTest.php

@@ -338,6 +338,27 @@ abstract class AbstractTableLayoutTest extends AbstractLayoutTest
             ]
     ]
     [count(.//input)=3]
+'
+        );
+    }
+
+    /**
+     * The block "_name_child_label" should be overridden in the theme of the
+     * implemented driver.
+     */
+    public function testCollectionRowWithCustomBlock()
+    {
+        $collection = array('one', 'two', 'three');
+        $form = $this->factory->createNamedBuilder('name', 'collection', $collection)
+            ->getForm();
+
+        $this->assertWidgetMatchesXpath($form->createView(), array(),
+'/table
+    [
+        ./tr[./td/label[.="Custom label: [trans]0[/trans]"]]
+        /following-sibling::tr[./td/label[.="Custom label: [trans]1[/trans]"]]
+        /following-sibling::tr[./td/label[.="Custom label: [trans]2[/trans]"]]
+    ]
 '
         );
     }