allow to add object initializers, for complex valdations as unique entity

src/Silex/Provider/ValidatorServiceProvider.php

@@ -38,7 +38,9 @@ class ValidatorServiceProvider implements ServiceProviderInterface
             return new Validator(
                 $app['validator.mapping.class_metadata_factory'],
                 $app['validator.validator_factory'],
-                isset($app['translator']) ? $app['translator'] : new DefaultTranslator()
+                isset($app['translator']) ? $app['translator'] : new DefaultTranslator(),
+                'validators',
+                $app['validator.object_initializers']
             );
         });
 
@@ -51,6 +53,10 @@ class ValidatorServiceProvider implements ServiceProviderInterface
 
             return new ConstraintValidatorFactory($app, $validators);
         });
+
+        $app['validator.object_initializers'] = $app->share(function ($app) {
+            return array();
+        });
     }
 
     public function boot(Application $app)