[Validator] Add normalizer option to Unique constraint

src/Symfony/Component/Validator/CHANGELOG.md

@@ -3,7 +3,7 @@ CHANGELOG
 
 5.3
 ---
-
+ * Add the `normalizer` option to the `Unique` constraint
  * Add `Validation::createIsValidCallable()` that returns true/false instead of throwing exceptions
 
 5.2.0

src/Symfony/Component/Validator/Constraints/Unique.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Validator\Constraints;
 
 use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\InvalidArgumentException;
 
 /**
  * @Annotation
@@ -29,15 +30,22 @@ class Unique extends Constraint
     ];
 
     public $message = 'This collection should contain only unique elements.';
+    public $normalizer;
 
     public function __construct(
         array $options = null,
         string $message = null,
+        callable $normalizer = null,
         array $groups = null,
         $payload = null
     ) {
         parent::__construct($options, $groups, $payload);
 
         $this->message = $message ?? $this->message;
+        $this->normalizer = $normalizer ?? $this->normalizer;
+
+        if (null !== $this->normalizer && !\is_callable($this->normalizer)) {
+            throw new InvalidArgumentException(sprintf('The "normalizer" option must be a valid callable ("%s" given).', get_debug_type($this->normalizer)));
+        }
     }
 }

src/Symfony/Component/Validator/Constraints/UniqueValidator.php

@@ -39,7 +39,10 @@ class UniqueValidator extends ConstraintValidator
         }
 
         $collectionElements = [];
+        $normalizer = $this->getNormalizer($constraint);
         foreach ($value as $element) {
+            $element = $normalizer($element);
+
             if (\in_array($element, $collectionElements, true)) {
                 $this->context->buildViolation($constraint->message)
                     ->setParameter('{{ value }}', $this->formatValue($value))
@@ -51,4 +54,15 @@ class UniqueValidator extends ConstraintValidator
             $collectionElements[] = $element;
         }
     }
+
+    private function getNormalizer(Unique $unique): callable
+    {
+        if (null === $unique->normalizer) {
+            return static function ($value) {
+                return $value;
+            };
+        }
+
+        return $unique->normalizer;
+    }
 }

src/Symfony/Component/Validator/Tests/Constraints/UniqueTest.php

@@ -13,14 +13,15 @@ namespace Symfony\Component\Validator\Tests\Constraints;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Validator\Constraints\Unique;
+use Symfony\Component\Validator\Exception\InvalidArgumentException;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Mapping\Loader\AnnotationLoader;
 
+class UniqueTest extends TestCase
+{
     /**
      * @requires PHP 8
      */
-class UniqueTest extends TestCase
-{
     public function testAttributes()
     {
         $metadata = new ClassMetadata(UniqueDummy::class);
@@ -34,6 +35,23 @@ class UniqueTest extends TestCase
         [$cConstraint] = $metadata->properties['c']->getConstraints();
         self::assertSame(['my_group'], $cConstraint->groups);
         self::assertSame('some attached data', $cConstraint->payload);
+
+        [$dConstraint] = $metadata->properties['d']->getConstraints();
+        self::assertSame('intval', $dConstraint->normalizer);
+    }
+
+    public function testInvalidNormalizerThrowsException()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The "normalizer" option must be a valid callable ("string" given).');
+        new Unique(['normalizer' => 'Unknown Callable']);
+    }
+
+    public function testInvalidNormalizerObjectThrowsException()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The "normalizer" option must be a valid callable ("stdClass" given).');
+        new Unique(['normalizer' => new \stdClass()]);
     }
 }
 
@@ -47,4 +65,7 @@ class UniqueDummy
 
     #[Unique(groups: ['my_group'], payload: 'some attached data')]
     private $c;
+
+    #[Unique(normalizer: 'intval')]
+    private $d;
 }

src/Symfony/Component/Validator/Tests/Constraints/UniqueValidatorTest.php

@@ -99,4 +99,136 @@ class UniqueValidatorTest extends ConstraintValidatorTestCase
             ->setCode(Unique::IS_NOT_UNIQUE)
             ->assertRaised();
     }
+
+    /**
+     * @dataProvider getCallback
+     */
+    public function testExpectsUniqueObjects($callback)
+    {
+        $object1 = new \stdClass();
+        $object1->name = 'Foo';
+        $object1->email = 'foo@email.com';
+
+        $object2 = new \stdClass();
+        $object2->name = 'Foo';
+        $object2->email = 'foobar@email.com';
+
+        $object3 = new \stdClass();
+        $object3->name = 'Bar';
+        $object3->email = 'foo@email.com';
+
+        $value = [$object1, $object2, $object3];
+
+        $this->validator->validate($value, new Unique([
+            'normalizer' => $callback,
+        ]));
+
+        $this->assertNoViolation();
+    }
+
+    /**
+     * @dataProvider getCallback
+     */
+    public function testExpectsNonUniqueObjects($callback)
+    {
+        $object1 = new \stdClass();
+        $object1->name = 'Foo';
+        $object1->email = 'bar@email.com';
+
+        $object2 = new \stdClass();
+        $object2->name = 'Foo';
+        $object2->email = 'foo@email.com';
+
+        $object3 = new \stdClass();
+        $object3->name = 'Foo';
+        $object3->email = 'foo@email.com';
+
+        $value = [$object1, $object2, $object3];
+
+        $this->validator->validate($value, new Unique([
+            'message' => 'myMessage',
+            'normalizer' => $callback,
+        ]));
+
+        $this->buildViolation('myMessage')
+            ->setParameter('{{ value }}', 'array')
+            ->setCode(Unique::IS_NOT_UNIQUE)
+            ->assertRaised();
+    }
+
+    public function getCallback()
+    {
+        return [
+            yield 'static function' => [static function (\stdClass $object) {
+                return [$object->name, $object->email];
+            }],
+            yield 'callable with string notation' => ['Symfony\Component\Validator\Tests\Constraints\CallableClass::execute'],
+            yield 'callable with static notation' => [[CallableClass::class, 'execute']],
+            yield 'callable with object' => [[new CallableClass(), 'execute']],
+        ];
+    }
+
+    public function testExpectsInvalidNonStrictComparison()
+    {
+        $this->validator->validate([1, '1', 1.0, '1.0'], new Unique([
+            'message' => 'myMessage',
+            'normalizer' => 'intval',
+        ]));
+
+        $this->buildViolation('myMessage')
+            ->setParameter('{{ value }}', 'array')
+            ->setCode(Unique::IS_NOT_UNIQUE)
+            ->assertRaised();
+    }
+
+    public function testExpectsValidNonStrictComparison()
+    {
+        $callback = static function ($item) {
+            return (int) $item;
+        };
+
+        $this->validator->validate([1, '2', 3, '4.0'], new Unique([
+            'normalizer' => $callback,
+        ]));
+
+        $this->assertNoViolation();
+    }
+
+    public function testExpectsInvalidCaseInsensitiveComparison()
+    {
+        $callback = static function ($item) {
+            return mb_strtolower($item);
+        };
+
+        $this->validator->validate(['Hello', 'hello', 'HELLO', 'hellO'], new Unique([
+            'message' => 'myMessage',
+            'normalizer' => $callback,
+        ]));
+
+        $this->buildViolation('myMessage')
+            ->setParameter('{{ value }}', 'array')
+            ->setCode(Unique::IS_NOT_UNIQUE)
+            ->assertRaised();
+    }
+
+    public function testExpectsValidCaseInsensitiveComparison()
+    {
+        $callback = static function ($item) {
+            return mb_strtolower($item);
+        };
+
+        $this->validator->validate(['Hello', 'World'], new Unique([
+            'normalizer' => $callback,
+        ]));
+
+        $this->assertNoViolation();
+    }
+}
+
+class CallableClass
+{
+    public static function execute(\stdClass $object)
+    {
+        return [$object->name, $object->email];
+    }
 }