public function getHandle()
    {
        if (!isset($this->handle) && $this->fieldId) {
            $field = Craft::$app->fields->getFieldById($this->fieldId);
            
            foreach ($field->getBlockTypes() as $index => $blockType) {
                if ($blockType->id == $this->id) {
                    $this->handle = $field->handle . '-' . $index;
                    break;
                }
            }
        }

        return $this->handle;
    }