[Demo] Local-only supabase todo app

demos/local-only-todolist/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+# asdf
+.tool-versions
+
+# secrets
+app_config.dart

demos/local-only-todolist/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "5dcb86f68f239346676ceb1ed1ea385bd215fba1"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+      base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+    - platform: macos
+      create_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+      base_revision: 5dcb86f68f239346676ceb1ed1ea385bd215fba1
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

demos/local-only-todolist/LICENSE

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demos/local-only-todolist/README.md

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+# PowerSync + Supabase Flutter Local Only to Online Mode Demo: Todo List App
+
+This demo app is an extension of the Flutter Todo List App that demonstrates how to use the PowerSync SDK for Flutter in an local only way. It allows the user to use the app offline without having to sign in. After signing in data that was kept locally is synced up. For a step-by-step guide, see [here](https://docs.powersync.com/integration-guides/supabase).
+
+# Running the app
+
+Ensure you have [melos](https://melos.invertase.dev/~melos-latest/getting-started) installed.
+
+1. `cd demos/local-only-todolist`
+2. `melos prepare`
+3. `cp lib/app_config_template.dart lib/app_config.dart`
+4. Insert your Supabase and PowerSync project credentials into `lib/app_config.dart` (See instructions below)
+5. `flutter run`
+
+# Set up Supabase Project
+
+Create a new Supabase project, and paste an run the contents of [database.sql](./database.sql) in the Supabase SQL editor.
+
+It does the following:
+
+1. Create `lists` and `todos` tables.
+2. Create a publication called `powersync` for `lists` and `todos`.
+3. Enable row level security, allowing users to only view and edit their own data.
+4. Create a trigger to populate some sample data when an user registers.
+
+# Set up PowerSync Instance
+
+Create a new PowerSync instance, connecting to the database of the Supabase project.
+
+Then deploy the following sync rules:
+
+```yaml
+bucket_definitions:
+  user_lists:
+    # Separate bucket per todo list
+    parameters: select id as list_id from lists where owner_id = token_parameters.user_id
+    data:
+      - select * from lists where id = bucket.list_id
+      - select * from todos where list_id = bucket.list_id
+```
+
+# Configure the app
+
+Insert the credentials of your new Supabase and PowerSync projects into `lib/app_config.dart`
+
+# Explanation
+
+The demo implements local-only and synced modes by using two sets of schema definitions, which can be viewed [here](./lib/models/schema.dart). The app initially starts in local only mode with the offline schema. When the user signs in, the database schema is updated to the online schema, and the data is migrated to enable synchronization.
+
+After this point, being signed in no longer determines which schema should be used, as the user's session expiring and explicitly signing out trigger different behaviors. If the session expires, the user can continue interacting with their data. However, if the user explicitly logs out, all data is cleared, effectively resetting the app. To manage this, an additional local storage mechanism is used to track which schema is currently in use, as seen [here](./lib/models/sync_mode.dart.dart). Note that any other local storage solution would work as long as it's not using the PowerSync database (chicken and egg problem).
+
+## Flow chart
+
+```mermaid
+graph TD
+    K[Start] --> A[App is empty and local-only]
+    A --> B[User can create 0 or more todos that are stored local-only]
+    A --> C[User can login/register]
+    B -->
+    C --> D[Local-only data gets synced to PowerSync service]
+    D --> E[User can create 0 or more todos that will get synced]
+    D --> F
+    E --> F[User can logout explicitly]
+    F --> A
+```
+
+## Limitations
+
+`updateSchema` cannot be called inside a transaction, and it's recommended to perform the schema update when the database isn't connected.
+Additionally, the current implementation of the PowerSync SDK's `watch` method may not correctly track tables that are altered by `updateSchema`. As a result, you will likely need to refresh your `watch` calls after the schema update is complete. In this demo, the `watch` calls are refreshed by navigating to the login and signup pages after the user successfully logs in and the schema update is finished.

demos/local-only-todolist/analysis_options.yaml

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+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at
+  # https://dart-lang.github.io/linter/lints/index.html.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

demos/local-only-todolist/android/.gitignore

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+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

demos/local-only-todolist/android/app/build.gradle

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+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        applicationId "co.powersync.demotodolist"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion 24
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}

demos/local-only-todolist/android/app/src/debug/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="co.powersync.demotodolist">
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>