diff --git a/src/Symfony/Component/Validator/Constraint.php b/src/Symfony/Component/Validator/Constraint.php
index 673b12ac00b3e..ce7064bb4017c 100644
--- a/src/Symfony/Component/Validator/Constraint.php
+++ b/src/Symfony/Component/Validator/Constraint.php
@@ -214,6 +214,16 @@ public function __get($option)
throw new InvalidOptionsException(sprintf('The option "%s" does not exist in constraint %s', $option, get_class($this)), array($option));
}
+ /**
+ * @param string $option The option name
+ *
+ * @return bool
+ */
+ public function __isset($option)
+ {
+ return 'groups' === $option;
+ }
+
/**
* Adds the given group if this constraint is in the Default group.
*
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/FileTest.php b/src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
index 8f05b827ef046..0f0e0ab6be692 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
@@ -26,6 +26,16 @@ public function testMaxSize($maxSize, $bytes, $binaryFormat)
$this->assertSame($bytes, $file->maxSize);
$this->assertSame($binaryFormat, $file->binaryFormat);
+ $this->assertTrue($file->__isset('maxSize'));
+ }
+
+ public function testMagicIsset()
+ {
+ $file = new File(array('maxSize' => 1));
+
+ $this->assertTrue($file->__isset('maxSize'));
+ $this->assertTrue($file->__isset('groups'));
+ $this->assertFalse($file->__isset('toto'));
}
/**
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