Set up Amplify DataStore

dependencies:
  flutter:
    sdk: flutter

  amplify_datastore: ^1.0.0
  amplify_flutter: ^1.0.0

compileOptions {
    // add this line to support Java8 features
    coreLibraryDesugaringEnabled true

    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

dependencies {
    // add this line to support Java8 features
    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

amplify init

# For new APIs
amplify add api

# For existing APIs
amplify update api

? Please select from one of the below mentioned services:
    `GraphQL`
? Here is the GraphQL API that we will create. Select a setting to edit or continue:
    `Name`
? Provide API name:
    `BlogAppApi`
? Here is the GraphQL API that we will create. Select a setting to edit or continue:
    `Authorization modes: API key (default, expiration time: 7 days from now)`
? Choose the default authorization type for the API
    `API key`
? Enter a description for the API key:
    `BlogAPIKey`
? After how many days from now the API key should expire (1-365):
    `365`
? Configure additional auth types?
    `No`
? Here is the GraphQL API that we will create. Select a setting to edit or continue:
    `Conflict detection (required for DataStore): Disabled`
? Enable conflict detection?
    `Yes`
? Select the default resolution strategy
    `Auto Merge`
? Here is the GraphQL API that we will create. Select a setting to edit or continue:
    `Continue`
? Choose a schema template
    `Single object with fields (e.g., “Todo” with ID, name, description)`

type Post @model {
  id: ID!
  title: String!
  status: PostStatus!
  rating: Int
  content: String
}

enum PostStatus {
  ACTIVE
  INACTIVE
}

amplify codegen models

import 'package:flutter/material.dart';
import 'package:amplify_flutter/amplify_flutter.dart';
import 'package:amplify_datastore/amplify_datastore.dart';

import 'amplifyconfiguration.dart';
import 'models/ModelProvider.dart';

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
    _configureAmplify();
  }

  Future<void> _configureAmplify() async {
    // Add the following lines to your app initialization to add the DataStore plugin
    final datastorePlugin =
        AmplifyDataStore(modelProvider: ModelProvider.instance);
    await Amplify.addPlugin(datastorePlugin);
    
    try {
      await Amplify.configure(amplifyconfig);
    } on AmplifyAlreadyConfiguredException {
      safePrint(
          'Tried to reconfigure Amplify; this can occur when your app restarts on Android.');
    }
  }

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: SizedBox.shrink(),
      ),
    );
  }
}

import 'package:amplify_flutter/amplify_flutter.dart';

import 'models/ModelProvider.dart';

Future<void> savePost() async {
  final newPost = Post(
    title: 'New Post being saved',
    rating: 15,
    status: PostStatus.INACTIVE,
  );

  try {
    await Amplify.DataStore.save(newPost);
  } on DataStoreException catch (e) {
    safePrint('Something went wrong saving model: ${e.message}');
  }
}

import 'package:amplify_flutter/amplify_flutter.dart';

import 'models/ModelProvider.dart';

Future<void> queryPosts() async {
  try {
    final posts = await Amplify.DataStore.query(Post.classType);
    safePrint('Posts: $posts');
  } on DataStoreException catch (e) {
    safePrint('Something went wrong querying posts: ${e.message}');
  }
}