toJson method

Implementation

@override
Map<String, dynamic> toJson() {
  return {
    '@type': 'document',
    if (extra != null) '@extra': extra,
    'file_name': file_name,
    'mime_type': mime_type,
    'minithumbnail': minithumbnail,
    'thumbnail': thumbnail,
    'document': document
  };
}