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Showing content from https://github.com/mongodb/template-app-dart-flutter-todo below:

GitHub - mongodb/template-app-dart-flutter-todo: Atlas Template Starter App

A todo list application built with the Atlas Device SDK for Flutter and Atlas Device Sync.

TIP: Follow along with the Flutter Tutorial to see how to build, modify, and run this template app.

Warning

As of September 2024, Atlas Device SDKs are deprecated. Atlas Device SDKs will reach end-of-life and will no longer be maintained by MongoDB on September 30, 2025.

The template app in this repository should only be used as a reference for the on-device database and not to create a new app based on Device Sync. Refer to the deprecation page for details.

You can get started with this template app in two ways:

• Create a new pre-configured template app and get started immediately
• Clone the GitHub mongodb/template-app-dart-flutter-todo repository and use it with a new or existing App Services App backend

The easiest way to work with this template app is to create a new App Services App based on this Flutter template. The app is configured to run this client as a Real-Time Sync demo and comes pre-populated with the correct values for your app.

• To create an App from the UI:

  1. Log on to Atlas App Services.
  2. Click the Create App From Template button.
  3. Select Real Time Sync, and follow the prompts.
  4. Download the front-end code for your app.

• To create an App from the CLI:

  1. Log on to the CLI

     appservices login --api-key="<YOUR-API-KEY>" --private-api-key="<YOUR-PRIVATE-API-KEY>"

  2. Create the app

     appservices apps create --template flutter.todo.flex -n "<YOUR-APP-NAME>"

  3. Work with your app

     cd "<YOUR-APP-NAME>"/frontend/flutter.todo.flex

You're all set with a pre-configured app that's ready to run!

If you choose to clone this project from GitHub, you can use it with an existing App Services App or you can create a new one. The only requirement is that your app has Device Sync enabled.

1. Clone the GitHub mongodb/template-app-dart-flutter-todo repository.
2. If you don't already have an App Services App, create an App with Device Sync enabled. This is the backend that you'll configure to use with this client template.
3. Note your App ID, Project ID, and cluster name. You'll need it in the next step.

1. Open your /assets/config/atlasConfig.json file. It should contain the following:

   • appId: your Atlas App Services App ID. This should be similar to YOUR-APP-ID-123XYZ.
   • baseUrl: the App Services backend URL. This should be https://services.cloud.mongodb.com in most cases.
   • dataExplorerLink: the App Services Data Explorer URL that lets you view your synced data in Atlas from the app. This should be similar to https://cloud.mongodb.com/links/<YOUR-ATLAS-PROJECT-ID>/explorer/<YOUR-CLUSTER-NAME>/database/collection/find.

2. Update with the values for your app:

   • Your App ID: How to find your App ID.
   • Your Project ID: How to find your Project ID.
   • Your cluster name. If you used the default, this is Cluster0.

1. Navigate to the project.
2. Run flutter pub get
3. Run the app:
   • on Windows, Linux and macOS: flutter run
   • on Android emulator or iOS Simulator:
     • if only one emulator or iOS Simulator is available: flutter run .
     • if multiple are available, get the device id: flutter devices, and start the app: flutter run -d <device-id>

For more information on running a Flutter app, refer to the Flutter Test Drive documentation.

Once you're up and running, you can get started building on this template.

Or you can follow along with the Flutter Tutorial to learn how to build on top of this template app.

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type 'Null' is not a subtype of type 'String'

This error occurs if the dataExplorerLink field in your /assets/config/atlasConfig.json is invalid.

To resolve it, ensure the dataExplorerLink field is populated with the correct project ID and cluster name values.

NOTE: If you used the Flutter template app, then this field should have been pre-populated with the correct URL.

Please report issues with the template at https://github.com/mongodb-university/realm-template-apps/issues/new.

• For more information on this and the other available Atlas Device SDK template apps, check out the App Services Template App documentation.

• Learn more about developing with the Flutter SDK with the Atlas Device SDK and API docs.

• Check out some example Flutter and Dart apps built using the Flutter SDK in the realm-dart-samples GitHub repo.

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