def METHOD_NAME(self, obj):
    """Get the serialized folders of the event."""
    _folders = []
    for folder in obj['folders']:
        _folder = {
            'folder_id': folder['id'],
            'title': folder['title'],
            'description': folder['description'],
        }
        if folder['attachments']:
            _attachments = []
            for att in folder['attachments']:
                _attachments.append({
                    'attachment_id': att['id'],
                    'title': att['title'],
                    'size': att['size'],
                    'filename': att['filename'],
                    'description': att['description'],
                    'content_type': att['content_type'],
                    'modified_dt': att['modified_dt'],
                    'download_url': att['download_url'],
                })
            _folder.update({'attachments': _attachments})
        _folders.append(_folder)
    return _folders