How to create sublist with all values taken from List<User> in flutter?

user_18401788 0
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I have a question how to keep all data in sublist created from main list in Flutter? I created simple code to explain what i am looking for. I managed to save one value - swimmer.nameModel but i need all of them. Is any good tutorial to learn this subject properly? Thanks in advance. Here is my code:

import 'package:flutter/material.dart';

class ModelUser {
  final String nameModel;
  final String surnameModel;
  final String? imageModel;
  final String? mobileModel;
  final String? emailModel;
  final String? addressModel;
  final List<String?> joinedGroupsModel;

  const ModelUser({
    Key? key,
    required this.nameModel,
    required this.surnameModel,
    this.imageModel,
    this.mobileModel,
    this.emailModel,
    this.addressModel,
    this.joinedGroupsModel = const [],
  });
}

List<ModelUser> allUsers = [
  const ModelUser(
      nameModel: 'John',
      surnameModel: 'Newman',
      joinedGroupsModel: ['Swimmers', 'Runners', 'Footballers']),
  const ModelUser(nameModel: 'Barry', surnameModel: 'Newday'),
  const ModelUser(
      nameModel: 'Mike',
      surnameModel: 'Smith',
      joinedGroupsModel: ['Swimmers', 'Runners', 'Footballers']),
  const ModelUser(
      nameModel: 'Harry',
      surnameModel: 'Portland',
      joinedGroupsModel: ['Footballers']),
  const ModelUser(
      nameModel: 'Cathy',
      surnameModel: 'Portman',
      joinedGroupsModel: ['Swimmers', 'Runners', 'Footballers']),
  const ModelUser(
      nameModel: 'Jessie',
      surnameModel: 'Olert',
      joinedGroupsModel: ['Swimmers']),
];

class PageWhere extends StatelessWidget {
  static const String id = 'PageWhere';

  const PageWhere({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final swimmers =
        allUsers.where((user) => user.joinedGroupsModel.contains('Swimmers'));
    final List<String> listOfSwimmers = swimmers.map((swimmer) {
      return swimmer.nameModel;
    }).toList();

    return Column(
      children: [
        Text('Swimmers'),
        ...listOfSwimmers
            .map((value) => Text(value, style: TextStyle(fontSize: 20)))
            .toList(),
      ],
    );
  }
}

So instead of List-String listOfSwimmers how can I create List-ModelUser listOfSwimmers with all values provided in allUsers list?

dart flutter sublist list dictionary
1 Answers

I think you are looking for how to access UserModel containing Swimmers. So you just need to change List to List and return whole swimmer object. see changes in code:

class PageWhere extends StatelessWidget {
  static const String id = 'PageWhere';

  const PageWhere({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final swimmers =
        allUsers.where((user) => user.joinedGroupsModel.contains('Swimmers'));
    final List<ModelUser> listOfSwimmers = swimmers.map((swimmer) {
      return swimmer;
    }).toList();
    print(listOfSwimmers.runtimeType);

    return Scaffold(
      body: Center(
        child: Column(
          children: [
            Text('Swimmers'),
            ...listOfSwimmers
                .map((value) => Text("${value.nameModel} ${value.surnameModel}",
                    style: TextStyle(fontSize: 20)))
                .toList(),
          ],
        ),
      ),
    );
  }
}

enter image description here

user_157607440
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