The start of something beautiful

vendor/symfony/form/Event/PostSetDataEvent.php

@@ -0,0 +1,29 @@
+<?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\Event;
+
+use Symfony\Component\Form\Exception\BadMethodCallException;
+use Symfony\Component\Form\FormEvent;
+
+/**
+ * This event is dispatched at the end of the Form::setData() method.
+ *
+ * It can be used to modify a form depending on the populated data (adding or
+ * removing fields dynamically).
+ */
+final class PostSetDataEvent extends FormEvent
+{
+    public function setData(mixed $data): never
+    {
+        throw new BadMethodCallException('Form data cannot be changed during "form.post_set_data", you should use "form.pre_set_data" instead.');
+    }
+}