* element factory edded for doctrine forms

* some fields changed to optional

src/DoctrineExpressiveModule/ConfigProvider.php

@@ -24,6 +24,7 @@ class ConfigProvider
     {
         return [
             'dependencies' => $this->getDependencies(),
+            'form_elements' => $this->getFormElements(),
         ];
     }
 
@@ -45,4 +46,19 @@ class ConfigProvider
             ],
         ];
     }
+
+    /**
+     * Returns the form dependencies
+     */
+    public function getFormElements() : array
+    {
+        return [
+            'aliases' => [
+                'doctrine.object_select' => Form\Element\ObjectSelect::class,
+            ],
+            'factories'  => [
+                Form\Element\ObjectSelect::class => Form\Element\ElementFactory::class,
+            ],
+        ];
+    }
 }

src/DoctrineExpressiveModule/Form/Element/ElementFactory.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace DoctrineExpressiveModule\Form\Element;
+
+use Interop\Container\ContainerInterface;
+
+class ElementFactory
+{
+
+    public function __invoke(ContainerInterface $container, string $elementClass)
+    {
+        $em = $container->get('doctrine.entity_manager.orm_default');
+        /** @var ObjectSelect|ObjectRadio|ObjectMultiCheckbox $element */
+        $element = new $elementClass();
+        $element->setOption('object_manager', $em);
+        return $element;
+    }
+}