Manajemen Query & Ekstraksi Data Efisien Di Flutter Dari Rest Api Di Flutter Dengan Laravel Rest Api — Part 3

Panduan praktis dan terstruktur mengenai panduan flutter dengan laravel rest api: menampilkan data di flutter dari rest api (part 3) berstandar enterprise. Pelajari konsep, implementasi kode modern, dan tips arsitektur enterprise siap produksi.

Selamat datang di seri tutorial engineering SiHubung! Pada artikel ini, kita akan membedah secara komprehensif implementasi Panduan Flutter Dengan Laravel Rest Api: Menampilkan Data Di Flutter Dari Rest Api (Part 3) Berstandar Enterprise dengan standar kode bersih (clean code), performa tinggi, dan arsitektur siap produksi.

Membangun aplikasi web di era modern memerlukan pondasi yang kokoh. Framework modern memberikan fleksibilitas luar biasa bagi developer untuk menghadirkan fitur kompleks secara cepat tanpa mengabaikan aspek keamanan dan keandalan sistem.

Tahapan Implementasi & Walkthrough Kode

Berikut adalah langkah demi langkah teknis yang dapat Anda ikuti langsung pada codebase Anda:

Tahap 1: Penulisan Kode & Konfigurasi

import 'package:flutter/material.dart';
import 'package:flutter_pemula/model/post.dart';

class PostView extends StatelessWidget {
  final Post post;

  const PostView({
    super.key,
    required this.post,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.start,
      children: [
        Image.network(
          post.image,
          height: 150,
          width: 150,
          fit: BoxFit.cover,
        ),
        const SizedBox(
          width: 16,
        ),
        Expanded(
          flex: 3,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                post.title,
                maxLines: 1,
                style: Theme.of(context).textTheme.bodyLarge,
              ),
              Text(post.content),
            ],
          ),
        )
      ],
    );
  }
}

Tahap 2: Penulisan Kode & Konfigurasi

import 'package:flutter/material.dart';

class Home extends StatefulWidget {
  const Home({super.key});

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    return const Placeholder();
  }
}

Tahap 3: Penulisan Kode & Konfigurasi

import 'package:flutter/material.dart';
import 'package:flutter_pemula/api/repository.dart';
import 'package:flutter_pemula/component/post_view.dart';
import 'package:flutter_pemula/model/post.dart';

class Home extends StatefulWidget {
  final String title;

  const Home({
    super.key,
    required this.title,
  });

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  final ScrollController _scrollController = ScrollController();
  final Repository _apiService = Repository();

  final List<Post> _posts = [];
  bool _isLoading = false;
  bool _hasMore = true;
  int _currentPage = 1;

  @override
  void initState() {
    super.initState();
    _loadPosts();
    _scrollController.addListener(() {
      if (_scrollController.position.pixels ==
          _scrollController.position.maxScrollExtent) {
        _loadMorePosts();
      }
    });
  }

  Future<void> _loadPosts() async {
    setState(() {
      _isLoading = true;
    });

    try {
      final result = await _apiService.fetchPosts(_currentPage);
      setState(() {
        _currentPage++;
        _posts.addAll(result['posts']);
        _hasMore = result['nextPageUrl'] != null;
      });
    } catch (e) {
      throw Exception(e.toString());
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<void> _loadMorePosts() async {
    if (_isLoading || !_hasMore) return;

    setState(() {
      _isLoading = true;
    });

    try {
      final result = await _apiService.fetchPosts(_currentPage);
      setState(() {
        _currentPage++;
        _posts.addAll(result['posts']);
        _hasMore = result['nextPageUrl'] != null;
      });
    } catch (e) {
      throw Exception(e.toString());
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: _buildPostList(),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          //TODO action to add and edit post
        },
        child: const Icon(Icons.add),
      ),
    );
  }

  Widget _buildPostList() {
    return ListView.builder(
      controller: _scrollController,
      itemCount: _posts.length + (_hasMore ? 1 : 0),
      itemBuilder: (context, index) {
        if (index == _posts.length) {
          return const Center(child: CircularProgressIndicator());
        }
        final post = _posts[index];

        return Padding(
          padding: const EdgeInsets.all(8.0),
          child: Card.filled(
            clipBehavior: Clip.hardEdge,
            child: InkWell(
              onTap: () {
                // Todo action ke detail post
              },
              child: Stack(
                children: [
                  PostView(post: post),
                  Positioned(
                    top: 2,
                    right: 2,
                    child: IconButton(
                      onPressed: () {
                        // TODO action to edit post
                      },
                      icon: const Icon(Icons.edit_rounded),
                    ),
                  ),
                  Positioned(
                    bottom: 2,
                    right: 2,
                    child: IconButton(
                      onPressed: () {
                        //TODO action delete post
                      },
                      icon: const Icon(Icons.delete_rounded),
                    ),
                  )
                ],
              ),
            ),
          ),
        );
      },
    );
  }

  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }
}

Tahap 4: Penulisan Kode & Konfigurasi

import 'package:flutter/material.dart';
import 'package:flutter_pemula/api/repository.dart';
import 'package:flutter_pemula/component/post_view.dart';
import 'package:flutter_pemula/model/post.dart';

Tahap 5: Penulisan Kode & Konfigurasi

class Home extends StatefulWidget {
  final String title;

  const Home({
    super.key,
    required this.title,
  });

  @override
  State<Home> createState() => _HomeState();
}

Tahap 6: Penulisan Kode & Konfigurasi

class _HomeState extends State<Home> {
  final ScrollController _scrollController = ScrollController();
  final Repository _apiService = Repository();

  final List<Post> _posts = [];
  bool _isLoading = false;
  bool _hasMore = true;
  int _currentPage = 1;

Tahap 7: Penulisan Kode & Konfigurasi

@override
void initState() {
  super.initState();
  _loadPosts();
  _scrollController.addListener(() {
    if (_scrollController.position.pixels ==
        _scrollController.position.maxScrollExtent) {
      _loadMorePosts();
    }
  });
}

Tahap 8: Penulisan Kode & Konfigurasi

Future<void> _loadPosts() async {
  setState(() {
    _isLoading = true;
  });

  try {
    final result = await _apiService.fetchPosts(_currentPage);
    setState(() {
      _currentPage++;
      _posts.addAll(result['posts']);
      _hasMore = result['nextPageUrl'] != null;
    });
  } catch (e) {
    throw Exception(e.toString());
  } finally {
    setState(() {
      _isLoading = false;
    });
  }
}

Tahap 9: Penulisan Kode & Konfigurasi

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      backgroundColor: Theme.of(context).colorScheme.inversePrimary,
      title: Text(widget.title),
    ),
    body: _buildPostList(),
    floatingActionButton: FloatingActionButton(
      onPressed: () {
        //TODO action to add and edit post
      },
      child: const Icon(Icons.add),
    ),
  );
}

Tahap 10: Penulisan Kode & Konfigurasi

Widget _buildPostList() {
  return ListView.builder(
    controller: _scrollController,
    itemCount: _posts.length + (_hasMore ? 1 : 0),
    itemBuilder: (context, index) {
      if (index == _posts.length) {
        return const Center(child: CircularProgressIndicator());
      }
      final post = _posts[index];

      return Padding(
        padding: const EdgeInsets.all(8.0),
        child: Card.filled(
          clipBehavior: Clip.hardEdge,
          child: InkWell(
            onTap: () {
              // Todo action ke detail post
            },
            child: Stack(
              children: [
                PostView(post: post),
                Positioned(
                  top: 2,
                  right: 2,
                  child: IconButton(
                    onPressed: () {
                      // TODO action to edit post
                    },
                    icon: const Icon(Icons.edit_rounded),
                  ),
                ),
                Positioned(
                  bottom: 2,
                  right: 2,
                  child: IconButton(
                    onPressed: () {
                      //TODO action delete post
                    },
                    icon: const Icon(Icons.delete_rounded),
                  ),
                )
              ],
            ),
          ),
        ),
      );
    },
  );
}

Tahap 11: Penulisan Kode & Konfigurasi

@override
void dispose() {
  _scrollController.dispose();
  super.dispose();
}

Tahap 12: Penulisan Kode & Konfigurasi

import 'package:flutter/material.dart';
import 'package:flutter_pemula/screen/home.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const Home(title: 'Tutorial Flutter Pemula'),
    );
  }
}

💡 Tips Rekayasa Perangkat Lunak (SiHubung Engineering Best Practice)

Selalu gunakan pendekatan deklaratif, validasi input seawal mungkin di boundary layer, dan lakukan logging terstruktur untuk memudahkan observability ketika sistem dijalankan di lingkungan cloud produksi.

Kesimpulan

Dengan mengikuti langkah-langkah terstruktur di atas, implementasi modul Anda akan jauh lebih rapi, aman dari bug umum, serta siap diskalakan ke lingkungan produksi.

Nantikan artikel tutorial praktis lainnya seputar fullstack development, microservices, dan otomasi AI di Blog Engineering SiHubung. Selamat mencoba!