add method helper on manager to simplify controller

The controller does not have to handle data of the form ExportType. The ExportManager now handles those data. This is supposed to limit the number of place where the form data are handled.

Controller/ExportController.php

@@ -25,11 +25,8 @@ namespace Chill\MainBundle\Controller;
 use Symfony\Bundle\FrameworkBundle\Controller\Controller;
 use Symfony\Component\HttpFoundation\Request;
 use Chill\MainBundle\Form\Type\Export\ExportType;
-use Chill\MainBundle\Form\Type\Export\PickFormatterType;
 use Chill\MainBundle\Form\Type\Export\FormatterType;
 use Symfony\Component\Form\Extension\Core\Type\FormType;
-use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Form\Extension\Core\Type\HiddenType;
 
 
 /**
@@ -108,6 +105,9 @@ class ExportController extends Controller
      */
     protected function createCreateFormExport($alias, $step, $data = array())
     {
+        /* @var $exportManager \Chill\MainBundle\Export\ExportManager */
+        $exportManager = $this->get('chill.main.export_manager');
+        
         $builder = $this->get('form.factory')
               ->createNamedBuilder(null, FormType::class, array(), array(
                     'method' => 'GET',
@@ -125,9 +125,11 @@ class ExportController extends Controller
         
         if ($step === 'formatter') {
             $builder->add('formatter', FormatterType::class, array(
-                'formatter_alias' => $data['export']['pick_formatter']['alias'],
+                'formatter_alias' => $exportManager
+                     ->getFormatterAlias($data['export']),
                 'export_alias' => $alias,
-                'aggregator_aliases' => array() //TODO
+                'aggregator_aliases' => $exportManager
+                    ->getUsedAggregatorsAliases($data['export'])
             ));
         }
         
@@ -171,7 +173,6 @@ class ExportController extends Controller
         
         if ($exportForm->isValid()) {
             $data = $exportForm->getData();
-            $this->get('session')->set('export_step', $data);
             $this->get('session')->set('export_step_raw', $request->query->all());
 
         $form = $this->createCreateFormExport($alias,