fix validator class metadata warning

src/Symfony/Component/Form/FieldFactory/ValidatorFieldFactoryGuesser.php

@@ -81,14 +81,17 @@ class ValidatorFieldFactoryGuesser implements FieldFactoryGuesserInterface
     {
         $guesses = array();
         $classMetadata = $this->metadataFactory->getClassMetadata($class);
-        $memberMetadatas = $classMetadata->getMemberMetadatas($property);
 
-        foreach ($memberMetadatas as $memberMetadata) {
-            $constraints = $memberMetadata->getConstraints();
+        if ($classMetadata->hasMemberMetadatas($property)) {
+            $memberMetadatas = $classMetadata->getMemberMetadatas($property);
 
-            foreach ($constraints as $constraint) {
-                if ($guess = $guessForConstraint($constraint)) {
-                    $guesses[] = $guess;
+            foreach ($memberMetadatas as $memberMetadata) {
+                $constraints = $memberMetadata->getConstraints();
+
+                foreach ($constraints as $constraint) {
+                    if ($guess = $guessForConstraint($constraint)) {
+                        $guesses[] = $guess;
+                    }
                 }
             }
         }

src/Symfony/Component/Validator/Mapping/ClassMetadata.php

@@ -207,6 +207,18 @@ class ClassMetadata extends ElementMetadata
         $this->members[$property][] = $metadata;
     }
 
+    /**
+     * Returns true if metadatas of members is present for the given property.
+     *
+     * @param string $property The name of the property
+     *
+     * @return Boolean
+     */
+    public function hasMemberMetadatas($property)
+    {
+        return array_key_exists($property, $this->members);
+    }
+
     /**
      * Returns all metadatas of members describing the given property
      *

tests/Symfony/Tests/Component/Validator/Mapping/ClassMetadataTest.php

@@ -109,6 +109,14 @@ class ClassMetadataTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($constraints, $members[0]->getConstraints());
     }
 
+    public function testMemberMetadatas()
+    {
+        $this->metadata->addPropertyConstraint('firstName', new ConstraintA());
+
+        $this->assertTrue($this->metadata->hasMemberMetadatas('firstName'));
+        $this->assertFalse($this->metadata->hasMemberMetadatas('non_existant_field'));
+    }
+
     public function testMergeConstraintsKeepsPrivateMembersSeperate()
     {
         $parent = new ClassMetadata(self::PARENTCLASS);