implement example

examples/postly/lib/data/model/post_model.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'post_model.freezed.dart';
+part 'post_model.g.dart';
+
+@freezed
+class PostModel with _$PostModel {
+  const factory PostModel({
+    required int id,
+    required String title,
+    required String body,
+  }) = _PostModel;
+
+  factory PostModel.fromJson(Map<String, dynamic> json) =>
+      _$PostModelFromJson(json);
+}

examples/postly/lib/data/network/json_placeholder_api.dart

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+import 'package:retrofit/retrofit.dart';
+import 'package:dio/dio.dart';
+
+import '../model/post_model.dart';
+
+part 'json_placeholder_api.g.dart';
+
+@RestApi(baseUrl: 'https://jsonplaceholder.typicode.com/')
+abstract class JsonPlaceholderApi {
+  factory JsonPlaceholderApi(Dio dio, {String baseUrl}) = _JsonPlaceholderApi;
+
+  @GET('/posts')
+  Future<List<PostModel>> getPosts();
+
+  @GET('/posts/{id}')
+  Future<PostModel> getPost(@Path('id') int id);
+}

examples/postly/lib/data/post_repository_impl.dart

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+import 'package:dartz/dartz.dart';
+import '../domain/entity/post.dart';
+import '../domain/repository/post_repository.dart';
+import 'network/json_placeholder_api.dart';
+
+class PostRepositoryImpl implements PostRepository {
+  final JsonPlaceholderApi api;
+
+  PostRepositoryImpl(this.api);
+
+  @override
+  Future<Either<Exception, List<Post>>> getPosts() async {
+    try {
+      final posts = await api.getPosts();
+      return Right(posts
+          .map((e) => Post(id: e.id, title: e.title, body: e.body))
+          .toList());
+    } catch (e) {
+      return Left(Exception(e.toString()));
+    }
+  }
+
+  @override
+  Future<Either<Exception, Post>> getPost(int id) async {
+    try {
+      final post = await api.getPost(id);
+      return Right(Post(id: post.id, title: post.title, body: post.body));
+    } catch (e) {
+      return Left(Exception(e.toString()));
+    }
+  }
+}