symfony
diff --git a/‎src/Symfony/Component/Validator/Constraints/UniqueValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraints/UniqueValidator.php
+3Lines changed: 3 additions & 0 deletions b/‎src/Symfony/Component/Validator/Constraints/UniqueValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraints/UniqueValidator.php
+3Lines changed: 3 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Validator/Tests/Constraints/UniqueValidatorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Tests/Constraints/UniqueValidatorTest.php
+25-4Lines changed: 25 additions & 4 deletions b/‎src/Symfony/Component/Validator/Tests/Constraints/UniqueValidatorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Tests/Constraints/UniqueValidatorTest.php
+25-4Lines changed: 25 additions & 4 deletions
@@ -79,6 +79,9 @@ private function reduceElementKeys(array $fields, array $element): array
     {
         $output = [];
         foreach ($fields as $field) {
+            if (!\is_string($field)) {
+                throw new UnexpectedTypeException($field, 'string');
+            }
             if (isset($element[$field])) {
                 $output[$field] = $element[$field];
             }
 
@@ -13,6 +13,7 @@
 
 use Symfony\Component\Validator\Constraints\Unique;
 use Symfony\Component\Validator\Constraints\UniqueValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Exception\UnexpectedValueException;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
 
@@ -228,10 +229,30 @@ public function testCollectionFieldsAreOptional()
         $this->assertNoViolation();
     }
 
+    /**
+     * @dataProvider getInvalidFieldNames
+     */
+    public function testCollectionFieldNamesMustBeString(string $type, mixed $field)
+    {
+        $this->expectException(UnexpectedTypeException::class);
+        $this->expectExceptionMessage(sprintf('Expected argument of type "string", "%s" given', $type));
+
+        $this->validator->validate([['value' => 5], ['id' => 1, 'value' => 6]], new Unique([$field]));
+    }
+
+    public function getInvalidFieldNames(): \Generator
+    {
+        return [
+            yield ['stdClass', new \stdClass()],
+            yield ['int', 2],
+            yield ['bool', false],
+        ];
+    }
+
     /**
      * @dataProvider getInvalidCollectionValues
      */
-    public function testInvalidCollectionValues($value, $fields)
+    public function testInvalidCollectionValues(array $value, array $fields)
     {
         $this->validator->validate($value, new Unique($fields, [
             'message' => 'myMessage',
@@ -243,18 +264,18 @@ public function testInvalidCollectionValues($value, $fields)
             ->assertRaised();
     }
 
-    public function getInvalidCollectionValues()
+    public function getInvalidCollectionValues(): \Generator
     {
         return [
-            yield 'unique string' => [[['lang' => 'eng', 'translation' => 'hi'], ['lang' => 'eng', 'translation' => 'hi'],
+            yield 'unique string' => [[['lang' => 'eng', 'translation' => 'hi'], ['lang' => 'eng', 'translation' => 'hello'],
             ], ['lang']],
             yield 'unique floats' => [[
                 ['latitude' => 51.509865, 'longitude' => -0.118092, 'poi' => 'capital'],
                 ['latitude' => 52.520008, 'longitude' => 13.404954],
                 ['latitude' => 51.509865, 'longitude' => -0.118092],
             ], ['latitude', 'longitude']],
             yield 'unique int' => [[
-                ['id' => 1, 'email' => 'bar@email.com'], ['id' => 1, 'email' => 'bar@email.com'],
+                ['id' => 1, 'email' => 'bar@email.com'], ['id' => 1, 'email' => 'foo@email.com'],
             ], ['id']],
         ];
     }
Original file line number	Diff line number	Diff line change
`@@ -79,6 +79,9 @@ private function reduceElementKeys(array $fields, array $element): array`
`79`	`79`	`{`
`80`	`80`	`$output = [];`
`81`	`81`	`foreach ($fields as $field) {`
	`82`	`+ if (!\is_string($field)) {`
	`83`	`+ throw new UnexpectedTypeException($field, 'string');`
	`84`	`+ }`
`82`	`85`	`if (isset($element[$field])) {`
`83`	`86`	`$output[$field] = $element[$field];`
`84`	`87`	`}`