The argument type 'Map Function()' can't be assigned to the parameter type 'Map'

Question

This could initially was working but after firebase update, it is now giving me this error. I have added asterisks to the part giving the error. The error message has been

Answer 1

Apparently all that was needed was parentheses on the maps

import 'package:cloud_firestore/cloud_firestore.dart';

class Record {
  final String name;
  final int votes;
  final DocumentReference reference;

  Record.fromMap(Map map(), {this.reference})
      : assert(map()['name'] != null),
        assert(map()['votes'] != null),
        name = map()['name'],
        votes = map()['votes'];

  Record.fromSnapshot(DocumentSnapshot snapshot)
      : this.fromMap(snapshot.data, reference: snapshot.reference);

  @override
  String toString() => "Record<$name:$votes>";
}