Actualización

vendor/symfony/doctrine-bridge/Form/DataTransformer/CollectionToArrayTransformer.php

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+<?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\Bridge\Doctrine\Form\DataTransformer;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class CollectionToArrayTransformer implements DataTransformerInterface
+{
+    /**
+     * Transforms a collection into an array.
+     *
+     * @return mixed An array of entities
+     *
+     * @throws TransformationFailedException
+     */
+    public function transform($collection)
+    {
+        if (null === $collection) {
+            return array();
+        }
+
+        // For cases when the collection getter returns $collection->toArray()
+        // in order to prevent modifications of the returned collection
+        if (\is_array($collection)) {
+            return $collection;
+        }
+
+        if (!$collection instanceof Collection) {
+            throw new TransformationFailedException('Expected a Doctrine\Common\Collections\Collection object.');
+        }
+
+        return $collection->toArray();
+    }
+
+    /**
+     * Transforms choice keys into entities.
+     *
+     * @param mixed $array An array of entities
+     *
+     * @return Collection A collection of entities
+     */
+    public function reverseTransform($array)
+    {
+        if ('' === $array || null === $array) {
+            $array = array();
+        } else {
+            $array = (array) $array;
+        }
+
+        return new ArrayCollection($array);
+    }
+}