aggregate method

Future aggregate(List<dynamic Function(List<Map<String, dynamic>>)> stages)

Implementation

Future<dynamic> aggregate(
    List<Function(List<Map<String, dynamic>>)> stages) async {
  List<Map<String, dynamic>> result = List.from(collection.values);
  for (final stage in stages) {
    await stage(result);
  }
  return result;
}