03_package_adapter.md

Package Adapter

To have dio adapters,

• Create adapter package into the packages folder:

cd packages
flutter create --template=package adapter

• Edit pubspec.yaml of the adapter package:

name: adapter
description: Adapter for fl_template
publish_to: none

version: 0.1.0

environment:
  sdk: ">=2.15.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
    
  dio: ^4.0.4
  intl: ^0.17.0
  logger: ^1.1.0
  model:
    path: ../model

dev_dependencies:
  flutter_test:
    sdk: flutter

  flutter_lints: ^1.0.4
  http_mock_adapter: ^0.3.2
  test: ^1.19.5

Install the packages for the model package with melos:

melos run upgrade

PlaceHolderAdapter

• Create an adapter to call API, ie., for the JsonPlaceHolder API.

class PlaceHolderAdapter {
  late final String baseUrl;
  late final Dio _dio;

  PlaceHolderAdapter({
    required this.baseUrl,
    Dio? dio,
  }) {
    _dio = dio ?? Dio();
    _dio.interceptors.add(AdapterInterceptor());
  }

  // get users
  Future<Response<dynamic>> getUsers() {
    return _dio.get(
      '$baseUrl/users',
    );
  }

  // ignore: type_annotate_public_apis
  void close() {
    _dio.close();
  }
}

• To test out the adapter, create a CLI dart class to execute it, for example,

• Or write tests with http_mock_adapter then execute them from VSCode or with melos run test.