Boilerplate code serialization

user.dart

class User extends Document {
  final Name name;
  final Address address;
  final Gender gender;
  final Birthday birthday;
  final Email email;
  final Weight weight;
  final Length height;
  final bool _hasFinishedSignUp;
  final Iterable<Bike> myBikes;
  final Set<AuthenticationProvider> _authenticationProvider;
  final Set<String> _notificationTokens;

  Iterable<String> get notificationToken => _notificationTokens;

  User updateAuthenticationProvider(
      List<AuthenticationProvider> newAuthenticationProvider) {
    return _copyWith(authenticationProvider: {
      ..._authenticationProvider,
      ...newAuthenticationProvider
    });
  }

  bool get needsEmailVerification =>
      _authenticationProvider.every((authenticationProvider) =>
          authenticationProvider == AuthenticationProvider.email);

  User finishSignUp() {
    return _copyWith(hasFinishedSignUp: true);
  }

  bool get hasEmailSettings =>
      _authenticationProvider.any((authenticationProvider) =>
          authenticationProvider == AuthenticationProvider.email);

  User selectBike(Bike bike) {
    var selectedBike = bike.select();
    if (myBikes.every((bike) => bike.mac != selectedBike.mac))
      return _copyWith(myBikes: [...myBikes, selectedBike]);
    return updateBike(bike);
  }

  ///If a bike is selected right now, lastSelectedBike is also the currently selected bike
  Bike get lastSelectedBike =>
      myBikes.sortByDescending((myBike) => myBike.lastTimeSelected).first;

  User updateBike(Bike bike) {
    return _copyWith(
        myBikes: myBikes
            .map((myBike) => myBike.mac == bike.mac ? bike : myBike.copyWith())
            .toList());
  }

  bool get hasFinishedSignUp => _hasFinishedSignUp;

  factory User(String id, AuthenticationProvider authenticationProvider) {
    return User._(
      id: id,
    ).updateAuthenticationProvider([authenticationProvider]);
  }

  User._(
      {String id,
      this.name,
      this.birthday,
      this.email,
      bool hasFinishedSignUp = false,
      this.gender,
      this.address,
      Set<AuthenticationProvider> authenticationProvider = const {},
      Set<String> notificationTokens = const {},
      this.height,
      this.weight,
      this.myBikes = const []})
      : _hasFinishedSignUp = hasFinishedSignUp,
        _authenticationProvider = authenticationProvider,
        _notificationTokens = notificationTokens,
        super(id: id);

  @override
  User copyWith(
      {String id,
      Email email,
      Name name,
      Address address,
      Gender gender,
      Birthday birthDay,
      Weight weight,
      Length height,
      bool setNameNull = false,
      bool setAddressNull = false,
      bool setBirthdayNull = false,
      bool setWeightNull = false,
      bool setHeightNull = false,
      bool setGenderNull = false}) {
    return _copyWith(
        id: id,
        email: email,
        name: name,
        address: address,
        gender: gender,
        birthday: birthDay,
        weight: weight,
        height: height,
        setAddressNull: setAddressNull,
        setNameNull: setNameNull,
        setBirthdayNull: setBirthdayNull,
        setWeightNull: setWeightNull,
        setGenderNull: setGenderNull);
  }

  User _copyWith(
      {Email email,
      Address address,
      Gender gender,
      Birthday birthday,
      Name name,
      bool hasFinishedSignUp,
      Set<AuthenticationProvider> authenticationProvider,
      Set<String> notificationTokens,
      Length height,
      Weight weight,
      bool setNameNull = false,
      bool setAddressNull = false,
      bool setBirthdayNull = false,
      bool setWeightNull = false,
      bool setHeightNull = false,
      bool setGenderNull = false,
      List<Bike> myBikes,
      String id}) {
    return User._(
        id: id ?? this.id,
        myBikes: myBikes ?? this.myBikes,
        email: email ?? this.email,
        name: setNameNull ? null : name ?? this.name,
        hasFinishedSignUp: hasFinishedSignUp ?? _hasFinishedSignUp,
        address: setAddressNull ? null : address ?? this.address,
        gender: setGenderNull ? null : gender ?? this.gender,
        birthday: setBirthdayNull ? null : birthday ?? this.birthday,
        authenticationProvider:
            authenticationProvider ?? _authenticationProvider,
        notificationTokens: notificationTokens ?? _notificationTokens,
        height: setHeightNull ? null : height ?? this.height,
        weight: setWeightNull ? null : weight ?? this.weight);
  }

  @override
  List<Object> get props => [
        name,
        address,
        gender,
        birthday,
        email,
        weight,
        height,
        myBikes,
        _hasFinishedSignUp,
        _authenticationProvider
      ];

  @override
  Map<String, dynamic> toMap() => <String, dynamic>{
        "name": name?.toMap(),
        "address": address?.toMap(),
        "gender": EnumToString.parse(gender),
        "birthday": birthday?.toMap(),
        "email": email?.toMap(),
        "weight": weight?.toMap(),
        "height": height?.toMap(),
        "myBikes": myBikes.map((bike) => bike.toMap()).toList(),
        "hasFinishedSignUp": _hasFinishedSignUp,
        "authenticationProvider": _authenticationProvider
            .map((provider) => EnumToString.parse(provider))
            .toList()
      };

  User.fromMap(Map<String, dynamic> map)
      : name = map["name"] == null
            ? null
            : Name.fromMap(map["name"] as Map<String, dynamic>),
        address = map["address"] == null
            ? null
            : Address.fromMap(map["address"] as Map<String, dynamic>),
        gender =
            EnumToString.fromString(Gender.values, map["gender"] as String),
        birthday = map["birthday"] == null
            ? null
            : Birthday.fromMap(map["birthday"] as Map<String, dynamic>),
        email = map["email"] == null
            ? null
            : Email.fromMap(map["email"] as Map<String, dynamic>),
        weight = map["weight"] == null
            ? null
            : Weight.fromMap(map["weight"] as Map<String, dynamic>),
        height = map["height"] == null
            ? null
            : Length.fromMap(map["height"] as Map<String, dynamic>),
        myBikes = (map["myBikes"] as List<dynamic>)
            .map((dynamic bikeMap) =>
                Bike.fromMap(bikeMap as Map<String, dynamic>))
            .toList(),
        _hasFinishedSignUp = map["hasFinishedSignUp"] as bool,
        _authenticationProvider =
            (map["authenticationProvider"] as List<dynamic>)
                .map((dynamic providerMap) => EnumToString.fromString(
                    AuthenticationProvider.values, providerMap as String))
                .toSet(),
        _notificationTokens = map["notificationTokens"] == null
            ? null
            : (map["notificationTokens"] as List<String>).toSet(),
        super.fromMap(map);
}