abstract class with factory

[tbm98]

Hi.
I have problem

Future<List<DBParseable>> getAllData(String tableName) async {
    final List<Map<String, dynamic>> maps = await _db.query(tableName);

    switch (tableName) {
      case Schedule.table:
        return List.generate(maps.length, (i) {
          return Schedule.fromJson(maps[i]);
        });
      case Mark.table:
        return List.generate(maps.length, (i) {
          return Mark.fromJson(maps[i]);
        });
      case Profile.table:
        return List.generate(maps.length, (i) {
          return Profile.fromJson(maps[i]);
        });
    }

    return null;
  }

as above function. If I want to parse object by factory .fromJson I can't use generic type because abstract class don't support factory without body.
If abstract class support factory I can do as below

abstract class DBParseable {
  String get tableName;
  Map<String, dynamic> toJson();
  factory fromJson(Map<String,dynamic> json);
}

Future<List<T>> getAllData<T extends DBParseable>(String tableName) async {
    final List<Map<String, dynamic>> maps = await _db.query(tableName);

    return List.generate(maps.length, (i) {
          return T.fromJson(maps[i]);
        });

    return null;
  }

[eernstg]

This topic may be a duplicate of #356, or at least closely related.