move queries in repository

Form/EventType.php

@@ -111,12 +111,18 @@ class EventType extends AbstractType
                 },
             ))
             ->add('type', PickEventTypeType::class, array(
-                'placeholder' => ''
+                'placeholder' => 'Pick a type of event',
+                'attr' => array(
+                    'class' => ''
+                )
             ))
             ->add('moderator', UserPickerType::class, array(
                 'center' => $options['center'],
                 'role'   => $options['role'],
-                'placeholder' => '',
+                'placeholder' => 'Pick a moderator',
+                'attr' => array(
+                    'class' => ''
+                ),
                 'required' => false
             ))
         ;

Form/Type/PickEventType.php

@@ -166,7 +166,7 @@ class PickEventType extends AbstractType
      */
     protected function filterCenters(Options $options)
     {
-        
+        // option role
         if ($options['role'] === NULL) {
             $centers = array_map(
                 function (GroupCenter $g) {
@@ -181,6 +181,7 @@ class PickEventType extends AbstractType
             );
         }
 
+        // option center
         if ($options['centers'] === NULL)
         {
             // we select all selected centers