class ImageEntry { final String postId; final String localFilename; final String url; ImageEntry( {required this.postId, required this.localFilename, required this.url}); ImageEntry.fromJson(Map json) : postId = json['postId'] ?? '', localFilename = json['localFilename'] ?? '', url = json['url'] ?? ''; Map toJson() => { 'postId': postId, 'localFilename': localFilename, 'url': url, }; }