Actualización

vendor/friendsofsymfony/user-bundle/Form/DataTransformer/UserToUsernameTransformer.php

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+<?php
+
+/*
+ * This file is part of the FOSUserBundle package.
+ *
+ * (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FOS\UserBundle\Form\DataTransformer;
+
+use FOS\UserBundle\Model\UserInterface;
+use FOS\UserBundle\Model\UserManagerInterface;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+
+/**
+ * Transforms between a UserInterface instance and a username string.
+ *
+ * @author Thibault Duplessis <thibault.duplessis@gmail.com>
+ */
+class UserToUsernameTransformer implements DataTransformerInterface
+{
+    /**
+     * @var UserManagerInterface
+     */
+    protected $userManager;
+
+    /**
+     * UserToUsernameTransformer constructor.
+     *
+     * @param UserManagerInterface $userManager
+     */
+    public function __construct(UserManagerInterface $userManager)
+    {
+        $this->userManager = $userManager;
+    }
+
+    /**
+     * Transforms a UserInterface instance into a username string.
+     *
+     * @param UserInterface|null $value UserInterface instance
+     *
+     * @return string|null Username
+     *
+     * @throws UnexpectedTypeException if the given value is not a UserInterface instance
+     */
+    public function transform($value)
+    {
+        if (null === $value) {
+            return;
+        }
+
+        if (!$value instanceof UserInterface) {
+            throw new UnexpectedTypeException($value, 'FOS\UserBundle\Model\UserInterface');
+        }
+
+        return $value->getUsername();
+    }
+
+    /**
+     * Transforms a username string into a UserInterface instance.
+     *
+     * @param string $value Username
+     *
+     * @return UserInterface the corresponding UserInterface instance
+     *
+     * @throws UnexpectedTypeException if the given value is not a string
+     */
+    public function reverseTransform($value)
+    {
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        if (!is_string($value)) {
+            throw new UnexpectedTypeException($value, 'string');
+        }
+
+        return $this->userManager->findUserByUsername($value);
+    }
+}