[Form] Add flexibility for EntityType

src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php

@@ -30,7 +30,7 @@ class ORMQueryBuilderLoader implements EntityLoaderInterface
      *
      * This property should only be accessed through queryBuilder.
      *
-     * @var QueryBuilder
+     * @var QueryBuilder|null
      */
     private $queryBuilder;
 
@@ -68,7 +68,7 @@ class ORMQueryBuilderLoader implements EntityLoaderInterface
 
             $queryBuilder = $queryBuilder($manager->getRepository($class));
 
-            if (!$queryBuilder instanceof QueryBuilder) {
+            if (null !== $queryBuilder && !$queryBuilder instanceof QueryBuilder) {
                 throw new UnexpectedTypeException($queryBuilder, 'Doctrine\ORM\QueryBuilder');
             }
         }
@@ -81,6 +81,10 @@ class ORMQueryBuilderLoader implements EntityLoaderInterface
      */
     public function getEntities()
     {
+        if (null === $this->queryBuilder) {
+            return array();
+        }
+        
         return $this->queryBuilder->getQuery()->execute();
     }
 
@@ -89,6 +93,10 @@ class ORMQueryBuilderLoader implements EntityLoaderInterface
      */
     public function getEntitiesByIds($identifier, array $values)
     {
+        if (null === $this->queryBuilder) {
+            return array();
+        }
+        
         $qb = clone ($this->queryBuilder);
         $alias = current($qb->getRootAliases());
         $parameter = 'ORMQueryBuilderLoader_getEntitiesByIds_'.$identifier;

src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypeTest.php

@@ -212,6 +212,19 @@ class EntityTypeTest extends TypeTestCase
 
         $field->submit('2');
     }
+    
+    public function testConfigureQueryBuilderWithClosureReturningNull()
+    {
+        $field = $this->factory->createNamed('name', 'entity', null, array(
+            'em' => 'default',
+            'class' => self::SINGLE_IDENT_CLASS,
+            'query_builder' => function () {
+                return null;
+            },
+        ));
+
+        $this->assertEquals(array(), $field->createView()->vars['choices']);
+    }
 
     public function testSetDataSingleNull()
     {