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Flutter has emerged as a popular framework for building cross-platform mobile applications. To enhance these applications with backend functionalities like authentication, database operations, and serverless functions, Supabase provides a robust solution. This tutorial will guide you through the process of integrating Supabase into a Flutter app.

Prerequisites

Before you start, ensure you have the following:

• Basic knowledge of Flutter and Dart
• Flutter environment set up
• Supabase account (create one at Supabase.io)

Step 1: Setting Up Your Supabase Project

• Create a new project in Supabase.
• Note down the API URL and anon key, which will be used in the Flutter app.

// Example of API URL and anon key (not real credentials)
const String supabaseUrl = 'https://yourproject.supabase.co';
const String supabaseAnonKey = 'your-anon-key';

Step 2: Integrating Supabase in Flutter

1. Add Supabase to your pubspec.yaml:

dependencies:
  flutter:
    sdk: flutter
  supabase_flutter: ^0.2.8

1. Initialize Supabase in your main Dart file:

import 'package:supabase_flutter/supabase_flutter.dart';

void main() {
  Supabase.initialize(
    url: supabaseUrl,
    anonKey: supabaseAnonKey,
  );
  runApp(MyApp());
}

Step 3: Implementing Authentication

Supabase provides easy-to-implement authentication features.

Sign Up a New User

Future<void> signUpUser(String email, String password) async {
  final response = await Supabase.instance.client.auth.signUp(email, password);
  if (response.error == null) {
    // Handle success
  } else {
    // Handle error
  }
}

Sign In an Existing User

Future<void> signInUser(String email, String password) async {
  final response = await Supabase.instance.client.auth.signIn(email: email, password: password);
  if (response.error == null) {
    // Handle success
  } else {
    // Handle error
  }
}

Step 4: Working with the Database

Supabase’s real-time database allows you to perform CRUD operations with ease.

Create a Record

Future<void> addData() async {
  final response = await Supabase.instance.client
      .from('your_table')
      .insert({'key': 'value'})
      .execute();
  if (response.error == null) {
    // Handle success
  } else {
    // Handle error
  }
}

Retrieve Data

Future<void> fetchData() async {
  final response = await Supabase.instance.client
      .from('your_table')
      .select()
      .execute();
  if (response.error == null) {
    // Handle data
  } else {
    // Handle error
  }
}

Step 5: Using Supabase Functions

Supabase Functions are serverless functions that can be triggered by HTTP requests.

Future<void> callFunction() async {
  final response = await Supabase.instance.client
      .rpc('function_name', params: {'param1': 'value'})
      .execute();
  if (response.error == null) {
    // Handle success
  } else {
    // Handle error
  }
}

Conclusion

Integrating Supabase with Flutter opens up a plethora of possibilities for developing feature-rich apps. By following this tutorial, you should now have a basic Flutter app integrated with Supabase for authentication, database operations, and serverless functions.

Remember to refer to the Supabase documentation for more detailed information and advanced features.