diff --git a/Form/DataTransformer/ModelToIdTransformer.php b/Form/DataTransformer/ModelToIdTransformer.php
new file mode 100644
index 0000000..9885273
--- /dev/null
+++ b/Form/DataTransformer/ModelToIdTransformer.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Propel\PropelBundle\Form\DataTransformer;
+
+use Propel\PropelBundle\Form\ChoiceList\ModelChoiceList;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+
+class ModelToIdTransformer implements DataTransformerInterface
+{
+    private $choiceList;
+
+    public function __construct(ModelChoiceList $choiceList)
+    {
+        $this->choiceList = $choiceList;
+    }
+
+    public function transform($model)
+    {
+        if (null === $model || '' === $model) {
+            return '';
+        }
+
+        if (!is_object($model)) {
+            throw new UnexpectedTypeException($model, 'object');
+        }
+
+        if (count($this->choiceList->getIdentifier()) > 1) {
+            $availableModels = $this->choiceList->getModels();
+
+            return array_search($model, $availableModels);
+        }
+
+        return current($this->choiceList->getIdentifierValues($model));
+    }
+
+    public function reverseTransform($key)
+    {
+        if ('' === $key || null === $key) {
+            return null;
+        }
+
+        if (count($this->choiceList->getIdentifier()) > 1 && !is_numeric($key)) {
+            throw new UnexpectedTypeException($key, 'numeric');
+        }
+
+        if (!($model = $this->choiceList->getModel($key))) {
+            throw new TransformationFailedException('The model with key "%s" could not be found', $key);
+        }
+
+        return $model;
+    }
+}
diff --git a/Form/DataTransformer/ModelsToArrayTransformer.php b/Form/DataTransformer/ModelsToArrayTransformer.php
new file mode 100644
index 0000000..99bca38
--- /dev/null
+++ b/Form/DataTransformer/ModelsToArrayTransformer.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace Propel\PropelBundle\Form\DataTransformer;
+
+use Symfony\Component\Form\DataTransformerInterface;
+use Propel\PropelBundle\Form\ChoiceList\ModelChoiceList;
+use \PropelCollection;
+
+class ModelsToArrayTransformer implements DataTransformerInterface
+{
+    private $choiceList;
+
+    public function __construct(ModelChoiceList $choiceList)
+    {
+        $this->choiceList = $choiceList;
+    }
+
+    public function transform($collection)
+    {
+        if (null === $collection) {
+            return array();
+        }
+
+        if (!($collection instanceof PropelCollection)) {
+            throw new UnexpectedTypeException($collection, '\PropelCollection');
+        }
+
+        $array = array();
+
+        if (count($this->choiceList->getIdentifier()) > 1) {
+            $availableModels = $this->choiceList->getModels();
+
+            foreach ($collection as $model) {
+                $key = array_search($model, $availableModels);
+                $array[] = $key;
+            }
+        } else {
+            foreach ($collection as $model) {
+                $array[] = current($this->choiceList->getIdentifierValues($model));
+            }
+        }
+
+        return $array;
+    }
+
+    public function reverseTransform($keys)
+    {
+        $collection = new PropelCollection();
+
+        if ('' === $keys || null === $keys) {
+            return $collection;
+        }
+
+        if (!is_array($keys)) {
+            throw new UnexpectedTypeException($keys, 'array');
+        }
+
+        $notFound = array();
+
+        foreach ($keys as $key) {
+            if ($model = $this->choiceList->getModel($key)) {
+                $collection->append($model);
+            } else {
+                $notFound[] = $key;
+            }
+        }
+
+        if (count($notFound) > 0) {
+            throw new TransformationFailedException(sprintf('The models with keys "%s" could not be found', implode('", "', $notFound)));
+        }
+
+        return $collection;
+    }
+}