Allow Pick*Type to submit the form when selection an entity, and apply inside Event

src/Bundle/ChillEventBundle/Controller/EventController.php

@@ -411,20 +411,17 @@ final class EventController extends AbstractController
                 ]
             );
 
-        $builder->add('person_id', PickPersonDynamicType::class, ['as_id' => true, 'multiple' => false]);
+        $builder->add('person_id', PickPersonDynamicType::class, [
+            'as_id' => true,
+            'multiple' => false,
+            'submit_on_adding_new_entity' => true,
+            'label' => 'Add a participation',
+        ]);
 
         $builder->add('event_id', HiddenType::class, [
             'data' => $event->getId(),
         ]);
 
-        $builder->add(
-            'submit',
-            SubmitType::class,
-            [
-                'label' => 'Add a participation',
-            ]
-        );
-
         return $builder->getForm();
     }