Merge branch '2.7' into 2.8

* 2.7:
  fixed undefined variable
  Fixed the phpDoc of UserInterface
  fixed APCu dep version
  make apc class loader testable against apcu without apc bc layer
  Added support for the `0.0.0.0/0` trusted proxy
  [DoctrineBridge][Validator] >= 2.3 Pass association instead of ID as argument
  added missing constant
  Added 451 status code
  Remove unnecessary code
  Allow absolute URLs to be displayed in the debug toolbar
  [ClassLoader] Use symfony/polyfill-apcu
  [HttpKernel] Lookup the response even if the lock was released after 2 seconds

Author: fabpot

Tests/Validator/Constraints/UniqueEntityValidatorTest.php

@@ -16,7 +16,6 @@
 use Doctrine\Common\Persistence\ObjectManager;
 use Doctrine\Common\Persistence\ObjectRepository;
 use Symfony\Bridge\Doctrine\Test\DoctrineTestHelper;
-use Symfony\Bridge\Doctrine\Tests\Fixtures\CompositeIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\SingleIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\DoubleNameEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\AssociationEntity;
@@ -404,7 +403,7 @@ public function testAssociatedEntity()
 
         $this->buildViolation('myMessage')
             ->atPath('property.path.single')
-            ->setInvalidValue(1)
+            ->setInvalidValue($entity1)
             ->assertRaised();
     }
 
@@ -428,29 +427,6 @@ public function testAssociatedEntityWithNull()
         $this->assertNoViolation();
     }
 
-    /**
-     * @expectedException \Symfony\Component\Validator\Exception\ConstraintDefinitionException
-     * @expectedExceptionMessage Associated entities are not allowed to have more than one identifier field
-     */
-    public function testAssociatedCompositeEntity()
-    {
-        $constraint = new UniqueEntity(array(
-            'message' => 'myMessage',
-            'fields' => array('composite'),
-            'em' => self::EM_NAME,
-        ));
-
-        $composite = new CompositeIntIdEntity(1, 1, 'test');
-        $associated = new AssociationEntity();
-        $associated->composite = $composite;
-
-        $this->em->persist($composite);
-        $this->em->persist($associated);
-        $this->em->flush();
-
-        $this->validator->validate($associated, $constraint);
-    }
-
     /**
      * @expectedException \Symfony\Component\Validator\Exception\ConstraintDefinitionException
      * @expectedExceptionMessage Object manager "foo" does not exist.

Validator/Constraints/UniqueEntityValidator.php

@@ -97,17 +97,6 @@ public function validate($entity, Constraint $constraint)
                  * getter methods in the Proxy are being bypassed.
                  */
                 $em->initializeObject($criteria[$fieldName]);
-
-                $relatedClass = $em->getClassMetadata($class->getAssociationTargetClass($fieldName));
-                $relatedId = $relatedClass->getIdentifierValues($criteria[$fieldName]);
-
-                if (count($relatedId) > 1) {
-                    throw new ConstraintDefinitionException(
-                        'Associated entities are not allowed to have more than one identifier field to be '.
-                        'part of a unique constraint in: '.$class->getName().'#'.$fieldName
-                    );
-                }
-                $criteria[$fieldName] = array_pop($relatedId);
             }
         }