merged branch jmikola/patch-2 (PR symfony#3535)

Commits
-------

a5ed6ab [DoctrineBridge] Rewind MongoCursor before use in unique validator

Discussion
----------

[DoctrineBridge] Rewind MongoCursor before use in unique validator

Fixes a regression I introduced in: 265360d

---------------------------------------------------------------------------

by jmikola at 2012-03-08T22:11:32Z

This was also reported in doctrine/DoctrineMongoDBBundle#84.

Let it be stated that we should create some functional tests for this validator :)

Author: fabpot

src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php

@@ -94,6 +94,14 @@ public function isValid($entity, Constraint $constraint)
         $repository = $em->getRepository($className);
         $result = $repository->findBy($criteria);
 
+        /* If the result is a MongoCursor, it must be advanced to the first
+         * element. Rewinding should have no ill effect if $result is another
+         * iterator implementation.
+         */
+        if ($result instanceof \Iterator) {
+            $result->rewind();
+        }
+
         /* If no entity matched the query criteria or a single entity matched,
          * which is the same as the entity being validated, the criteria is
          * unique.