How to ignore unknown types during serialization

[ramjke]

import 'dart:io';
import 'package:dart_json_mapper/dart_json_mapper.dart';

@jsonSerializable
class Folder {
  Folder({this.file});

  @JsonProperty(ignore: true)
  final File? file;
}

then JsonMapper.serialize(new Folder(file: localFile)) throws:

Unhandled Exception: It seems your class '_File' has not been annotated with @jsonSerializable

Expected: Serialize ignores file field on serialize

[k-paxian]

It's not an intended usage of ignore flag. Instead you would like to ignore unknown type, so for that to work please use following example

JsonMapper.serialize(new Folder(file: localFile), SerializationOptions(ignoreUnknownTypes: true));