/**
  * @param $path
  * @param Field $field
  * @return string
  */
 private function appendToPath($path, Field $field)
 {
     $display = $field->getDisplayName();
     if ($field instanceof RelationshipField) {
         if ($field->getCardinality() === Cardinality::MANY) {
             $display .= '[]';
         }
     }
     if (!empty($path)) {
         return $path . '.' . $display;
     } else {
         return $display;
     }
 }