[PropertyAccess] Fix Regression in PropertyAccessor::isWritable()

Author: haase-fabian

PropertyAccessor.php

@@ -313,10 +313,8 @@ public function isWritable($objectOrArray, $propertyPath)
                     if (!$zval[self::VALUE] instanceof \ArrayAccess && !\is_array($zval[self::VALUE])) {
                         return false;
                     }
-                } else {
-                    if (!$this->isPropertyWritable($zval[self::VALUE], $propertyPath->getElement($i))) {
-                        return false;
-                    }
+                } elseif (!\is_object($zval[self::VALUE]) || !$this->isPropertyWritable($zval[self::VALUE], $propertyPath->getElement($i))) {
+                    return false;
                 }
 
                 if (\is_object($zval[self::VALUE])) {
@@ -663,10 +661,6 @@ private function getWriteInfo(string $class, string $property, $value): Property
      */
     private function isPropertyWritable(object $object, string $property): bool
     {
-        if (!\is_object($object)) {
-            return false;
-        }
-
         $mutatorForArray = $this->getWriteInfo(\get_class($object), $property, []);
 
         if (PropertyWriteInfo::TYPE_NONE !== $mutatorForArray->getType() || ($object instanceof \stdClass && property_exists($object, $property))) {

Tests/PropertyAccessorArrayAccessTest.php

@@ -38,6 +38,14 @@ public function getValidPropertyPaths()
         ];
     }
 
+    public function getInvalidPropertyPaths()
+    {
+        return [
+            [$this->getContainer(['firstName' => 'Bernhard']), 'firstName', 'Bernhard'],
+            [$this->getContainer(['person' => $this->getContainer(['firstName' => 'Bernhard'])]), 'person.firstName', 'Bernhard'],
+        ];
+    }
+
     /**
      * @dataProvider getValidPropertyPaths
      */
@@ -83,4 +91,12 @@ public function testIsWritable($collection, $path)
     {
         $this->assertTrue($this->propertyAccessor->isWritable($collection, $path));
     }
+
+    /**
+     * @dataProvider getInvalidPropertyPaths
+     */
+    public function testIsNotWritable($collection, $path)
+    {
+        $this->assertFalse($this->propertyAccessor->isWritable($collection, $path));
+    }
 }