Resource creation (#26)

Author: f3ath

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Improved ResourceController error handling
+- Resource creation
 
 ## 0.1.0 - 2019-02-27
 ### Added

README.md

@@ -5,18 +5,19 @@
 - [x] Fetching single resources and resource collections
 - [x] Fetching relationships and related resources and collections
 - [x] Fetching single resources
-- [ ] Creating resources
+- [x] Creating resources
 - [ ] Updating resource's attributes
 - [ ] Updating resource's relationships
 - [ ] Updating relationships
 - [ ] Deleting resources
 - [ ] Asynchronous processing 
+- [ ] Optional check for `Content-Type` header in incoming responses 
 
 ##### Server (The Server API is not stable yet!)
 - [x] Fetching single resources and resource collections
 - [x] Fetching relationships and related resources and collections
 - [x] Fetching single resources
-- [ ] Creating resources
+- [x] Creating resources
 - [ ] Updating resource's attributes
 - [ ] Updating resource's relationships
 - [ ] Updating relationships
@@ -25,10 +26,13 @@
 - [ ] Sparse fieldsets 
 - [ ] Sorting, pagination, filtering
 - [ ] Asynchronous processing 
+- [ ] Optional check for `Content-Type` header in incoming requests 
+- [ ] Support annotations in resource mappers (?) 
 
 ##### Document
 - [ ] Support `meta` and `jsonapi` members
-- [ ] Structure Validation
+- [ ] Structure Validation including compound documents
+- [ ] Support relationship objects lacking the `data` member
 - [ ] Naming Validation
 - [ ] JSON:API v1.1 features
 
@@ -48,4 +52,4 @@ import 'package:http/browser_client.dart';
 final client = JsonApiClient(factory: () => BrowserClient());
 ```
 
-For usage examples see a corresponding test in `test/functional`.
+For usage examples see the [functional tests](https://github.com/f3ath/json-api-dart/tree/master/test/functional).

dart_test.yaml

@@ -0,0 +1 @@
+concurrency: 1

example/README.md

@@ -1,11 +1,11 @@
 # JSON:API examples
 
 ## [Cars Server](./cars_server)
-This is a simple JSON:API server which is used in the tests. It provides an API to a collection to car brands ad models.
+This is a simple JSON:API server which is used in the tests. It provides an API to a collection to car companies ad models.
 You can run it locally to play around.
 
 - In you console run `dart example/cars_server.dart`, this will start the server at port 8080.
-- Open http://localhost:8080/brands in the browser.
+- Open http://localhost:8080/companies in the browser.
 
 **Warning: Server API is not stable yet!**
 

example/cars_client.dart

@@ -1,9 +1,9 @@
 import 'dart:async';
 
 import 'package:json_api/client.dart';
-import 'package:json_api/src/transport/collection_document.dart';
-import 'package:json_api/src/transport/relationship.dart';
-import 'package:json_api/src/transport/resource_object.dart';
+import 'package:json_api/src/document/collection_document.dart';
+import 'package:json_api/src/document/relationship.dart';
+import 'package:json_api/src/document/resource_object.dart';
 
 class CarsClient {
   final JsonApiClient c;

example/cars_server.dart

@@ -14,13 +14,13 @@ void main() async {
 }
 
 SimpleServer createServer() {
-  final cars = CarDAO();
+  final models = ModelDAO();
   [
-    Car('1', 'Roadster'),
-    Car('2', 'Model S'),
-    Car('3', 'Model X'),
-    Car('4', 'Model 3'),
-  ].forEach(cars.insert);
+    Model('1', 'Roadster'),
+    Model('2', 'Model S'),
+    Model('3', 'Model X'),
+    Model('4', 'Model 3'),
+  ].forEach(models.insert);
 
   final cities = CityDAO();
   [
@@ -29,15 +29,27 @@ SimpleServer createServer() {
     City('3', 'Ingolstadt'),
   ].forEach(cities.insert);
 
-  final brands = BrandDAO();
+  final companies = CompanyDAO();
   [
-    Brand('1', 'Tesla', headquarters: '2', models: ['1', '2', '3', '4']),
-    Brand('2', 'BMW', headquarters: '1'),
-    Brand('3', 'Audi', headquarters: '3'),
-    Brand('4', 'Ford'),
-    Brand('5', 'Toyota')
-  ].forEach(brands.insert);
-
-  return SimpleServer(
-      CarsController({'brands': brands, 'cities': cities, 'cars': cars}));
+    Company('1', 'Tesla', headquarters: '2', models: ['1', '2', '3', '4']),
+    Company('2', 'BMW', headquarters: '1'),
+    Company('3', 'Audi'),
+  ].forEach(companies.insert);
+
+  return SimpleServer(CarsController(
+      {'companies': companies, 'cities': cities, 'models': models}));
+}
+
+class Url {
+  static final _base = Uri.parse('http://localhost:8080');
+
+  static collection(String type) => _base.replace(path: '/$type');
+
+  static resource(String type, String id) => _base.replace(path: '/$type/$id');
+
+  static related(String type, String id, String rel) =>
+      _base.replace(path: '/$type/$id/$rel');
+
+  static relationship(String type, String id, String rel) =>
+      _base.replace(path: '/$type/$id/relationships/$rel');
 }

example/cars_server/controller.dart

@@ -4,6 +4,7 @@ import 'package:json_api/src/identifier.dart';
 import 'package:json_api/src/resource.dart';
 import 'package:json_api/src/server/numbered_page.dart';
 import 'package:json_api/src/server/resource_controller.dart';
+import 'package:uuid/uuid.dart';
 
 import 'dao.dart';
 
@@ -30,7 +31,30 @@ class CarsController implements ResourceController {
   Stream<Resource> fetchResources(Iterable<Identifier> ids) async* {
     for (final id in ids) {
       final obj = dao[id.type].fetchById(id.id);
-      yield obj == null ? null : dao[id.type].toResource(obj);
+      if (obj == null) {
+        throw ResourceControllerException(404, detail: 'Resource not found');
+      }
+      yield dao[id.type].toResource(obj);
     }
   }
+
+  @override
+  Future<Resource> createResource(
+      String type, Resource resource, Map<String, String> params) async {
+    if (type != resource.type) {
+      throw ResourceControllerException(409, detail: 'Incompatible type');
+    }
+    Object obj;
+    if (resource.hasId) {
+      if (dao[type].fetchById(resource.id) != null) {
+        throw ResourceControllerException(409,
+            detail: 'Resource already exists');
+      }
+      obj = dao[type].create(resource);
+    } else {
+      obj = dao[type].create(resource.replace(id: Uuid().v4()));
+    }
+    dao[type].insert(obj);
+    return dao[type].toResource(obj);
+  }
 }

example/cars_server/dao.dart

@@ -10,6 +10,8 @@ abstract class DAO<T> {
 
   Resource toResource(T t);
 
+  T create(Resource resource);
+
   T fetchById(String id) => _collection[id];
 
   void insert(T t); // => collection[t.id] = t;
@@ -18,30 +20,43 @@ abstract class DAO<T> {
       _collection.values.skip(offset).take(limit);
 }
 
-class CarDAO extends DAO<Car> {
-  Resource toResource(Car _) =>
-      Resource('cars', _.id, attributes: {'name': _.name});
+class ModelDAO extends DAO<Model> {
+  Resource toResource(Model _) =>
+      Resource('models', _.id, attributes: {'name': _.name});
+
+  void insert(Model model) => _collection[model.id] = model;
 
-  void insert(Car car) => _collection[car.id] = car;
+  Model create(Resource r) {
+    return Model(r.id, r.attributes['name']);
+  }
 }
 
 class CityDAO extends DAO<City> {
   Resource toResource(City _) =>
       Resource('cities', _.id, attributes: {'name': _.name});
 
   void insert(City city) => _collection[city.id] = city;
+
+  City create(Resource r) {
+    return City(r.id, r.attributes['name']);
+  }
 }
 
-class BrandDAO extends DAO<Brand> {
-  Resource toResource(Brand brand) => Resource('brands', brand.id, attributes: {
-        'name': brand.name
+class CompanyDAO extends DAO<Company> {
+  Resource toResource(Company company) =>
+      Resource('companies', company.id, attributes: {
+        'name': company.name
       }, toOne: {
-        'hq': brand.headquarters == null
+        'hq': company.headquarters == null
             ? null
-            : Identifier('cities', brand.headquarters)
+            : Identifier('cities', company.headquarters)
       }, toMany: {
-        'models': brand.models.map((_) => Identifier('cars', _)).toList()
+        'models': company.models.map((_) => Identifier('models', _)).toList()
       });
 
-  void insert(Brand brand) => _collection[brand.id] = brand;
+  void insert(Company company) => _collection[company.id] = company;
+
+  Company create(Resource r) {
+    return Company(r.id, r.attributes['name']);
+  }
 }

example/cars_server/model.dart

@@ -1,10 +1,10 @@
-class Brand {
+class Company {
   final String id;
   final String headquarters;
   final List<String> models;
   String name;
 
-  Brand(this.id, this.name, {this.headquarters, this.models = const []});
+  Company(this.id, this.name, {this.headquarters, this.models = const []});
 }
 
 class City {
@@ -14,9 +14,9 @@ class City {
   City(this.id, this.name);
 }
 
-class Car {
+class Model {
   final String id;
   String name;
 
-  Car(this.id, this.name);
+  Model(this.id, this.name);
 }

lib/client.dart

@@ -1 +1,3 @@
 export 'package:json_api/src/client/client.dart';
+export 'package:json_api/src/identifier.dart';
+export 'package:json_api/src/resource.dart';