Fix UploadTrait::getFileUploadPropertyName for Doctrine proxy entity

Author: niels-nijens

Model/UploadTrait.php

@@ -51,7 +51,7 @@ public function getFileUploads()
      */
     public function setFileUpload(UploadedFile $file = null)
     {
-        $propertyName = $this->getFileUploadPropertyName();
+        $propertyName = $this->getFileUploadPropertyName(__FUNCTION__);
 
         unset($this->fileUploads[$propertyName]);
         if ($file instanceof UploadedFile) {
@@ -74,8 +74,14 @@ public function setFileUploadPath($directory)
      *
      * @return string
      */
-    private function getFileUploadPropertyName()
+    private function getFileUploadPropertyName($realCallerMethod)
     {
-        return lcfirst(substr(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS)[1]['function'], 3, -6));
+        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
+        $callerMethodName = $backtrace[1]['function'];
+        if ($callerMethodName === $realCallerMethod) {
+            $callerMethodName = $backtrace[2]['function'];
+        }
+
+        return lcfirst(substr($callerMethodName, 3, -6));
     }
 }