Removed MergeCollectionListener because merging is done in the model

Form/EventListener/MergeCollectionListener.php

@@ -1,50 +0,0 @@
-<?php
-
-/**
- * This file is part of the PropelBundle package.
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- *
- * @license    MIT License
- */
-
-namespace Propel\PropelBundle\Form\EventListener;
-
-use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Form\Event\FilterDataEvent;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-
-class MergeCollectionListener implements EventSubscriberInterface
-{
-    public static function getSubscribedEvents()
-    {
-        return array(FormEvents::BIND_NORM_DATA => 'onBindNormData');
-    }
-
-    public function onBindNormData(FilterDataEvent $event)
-    {
-        $collection = $event->getForm()->getData();
-        $data = $event->getData();
-
-        if (!$collection) {
-            $collection = $data;
-        } else if (count($data) === 0) {
-            $collection->clear();
-        } else {
-            // merge $data into $collection
-            foreach ($collection as $i => $model) {
-                if (false === $key = $data->search($model)) {
-                    $collection->remove($i);
-                } else {
-                    $data->remove($key);
-                }
-            }
-
-            foreach ($data as $model) {
-                $collection->append($model);
-            }
-        }
-
-        $event->setData($collection);
-    }
-}

Form/Type/ModelType.php

@@ -23,8 +23,7 @@ class ModelType extends AbstractType
     public function buildForm(FormBuilder $builder, array $options)
     {
         if ($options['multiple']) {
-            $builder->addEventSubscriber(new MergeCollectionListener())
-                ->prependClientTransformer(new ModelsToArrayTransformer($options['choice_list']));
+            $builder->prependClientTransformer(new ModelsToArrayTransformer($options['choice_list']));
         } else {
             $builder->prependClientTransformer(new ModelToIdTransformer($options['choice_list']));
         }