Question
Answer and Explanation
When using Supabase's sign-in with password feature in Flutter, handling errors gracefully is crucial for a smooth user experience. Here's how you can manage potential errors:
1. Using Try-Catch Blocks: Wrap your sign-in code within a try-catch block to catch any exceptions that might occur during the sign-in process.
2. Supabase Exceptions: Supabase throws specific exceptions, typically subclasses of AuthException, which can be caught and handled accordingly.
3. Identifying Specific Errors: You can check the error message or error code to differentiate between various issues, such as invalid credentials, network problems, or server errors.
4. Example Code:
import 'package:supabase_flutter/supabase_flutter.dart';
Future<void> signInWithPassword(String email, String password) async {
try {
final AuthResponse res = await Supabase.instance.client.auth.signInWithPassword(
email: email,
password: password,
);
if (res.user != null) {
// Sign in successful, handle accordingly, like navigating to home screen
print('User signed in: ${res.user?.email}');
} else {
print('User is null');
}
} on AuthException catch (error) {
print('Supabase Auth error: ${error.message}');
// Handle specific errors, like displaying a user-friendly error message
if (error.message.contains('invalid credentials')) {
print('Wrong email or password');
} else {
print('An error occurred during sign in.');
}
} catch (error) {
print('Unexpected error: $error');
// Handle unexpected errors, show a general error message
}
}
5. User Feedback: Always provide clear and user-friendly feedback. For instance, if the credentials are wrong, inform the user to check their email and password rather than displaying the raw error message. You could show a dialog, a Snackbar, or a text field error.
6. Common Errors: Some common errors include:
- Invalid Credentials: Wrong email or password.
- Network Issues: Unable to connect to the Supabase server.
- User Not Found: Attempting to sign in with a user that does not exist.
- Server Errors: Problems on the Supabase server side.
7. Error Handling Patterns:
- Display generic error for unexpected exceptions.
- Use a dedicated error handling service or function to reduce code duplication.
By implementing these error handling strategies, you can provide a more robust and user-friendly sign-in experience with Supabase in your Flutter application. Always remember to catch specific exceptions and present tailored messages to the end-user.