add(angel3): adding re-branded angel3 model package

packages/model/.gitignore

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+# See https://www.dartlang.org/tools/private-files.html
+
+# Files and directories created by pub
+.dart_tool
+.packages
+.pub/
+build/
+
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/
+
+### Dart template
+# See https://www.dartlang.org/tools/private-files.html
+
+# Files and directories created by pub
+
+# SDK 1.20 and later (no longer creates packages directories)
+
+# Older SDK versions
+# (Include if the minimum SDK version specified in pubsepc.yaml is earlier than 1.20)
+.project
+.buildlog
+**/packages/
+
+
+# Files created by dart2js
+# (Most Dart developers will use pub build to compile Dart, use/modify these
+#  rules if you intend to use dart2js directly
+#  Convention is to use extension '.dart.js' for Dart compiled to Javascript to
+#  differentiate from explicit Javascript files)
+*.dart.js
+*.part.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+
+# Don't commit pubspec lock file
+# (Library packages only! Remove pattern if developing an application package)
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+
+## VsCode
+.vscode/
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+.idea/
+/out/
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties

packages/model/AUTHORS.md

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+Primary Authors
+===============
+
+* __[Thomas Hii](dukefirehawk.apps@gmail.com)__
+
+    Thomas is the current maintainer of the code base. He has refactored and migrated the 
+    code base to support NNBD.
+
+* __[Tobe O](thosakwe@gmail.com)__
+
+    Tobe has written much of the original code prior to NNBD migration. He has moved on and
+    is no longer involved with the project.

packages/model/CHANGELOG.md

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+# Change Log
+
+## 8.1.1
+
+* Updated repository link
+
+## 8.1.0
+
+* Updated `lints` to 3.0.0
+* Fixed analyser warnings
+
+## 8.0.0
+
+* Require Dart >= 3.0
+
+## 7.1.0
+
+* Return -1 instead of throwing exception when id is null
+* Added `idAsString` to return id or "" if null
+* Added `AuditableModel`
+
+## 7.0.0
+
+* Require Dart >= 2.17
+
+## 6.0.0
+
+* Require Dart >= 2.16
+
+## 5.0.0
+
+* Skipped release
+
+## 4.0.0
+
+* Skipped release
+
+## 3.1.1
+
+* Removed `error`
+
+## 3.1.0
+
+* Updated linter to `package:lints`
+
+## 3.0.2
+
+* Updated README
+* Updated `idAsInt` to return `-1` instead of `null` for invalid id
+
+## 3.0.1
+
+* Updated README
+
+## 3.0.0
+
+* Migrated to support Dart >= 2.12 NNBD
+
+## 2.0.0
+
+* Migrated to work with Dart >= 2.12 Non NNBD
+
+## 1.0.3
+
+* `idAsInt` returns `null` when `id` is `null`.
+
+## 1.0.2
+
+* `idAsInt` now uses `int.tryParse`.
+
+## 1.0.1
+
+* Add `idAsInt`.
+
+## 1.0.0+1
+
+* Update constraint to work with Dart 2.

packages/model/LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2021, dukefirehawk.com
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

packages/model/README.md

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+# Angel3 Data Model
+
+![Pub Version (including pre-releases)](https://img.shields.io/pub/v/angel3_model?include_prereleases)
+[![Null Safety](https://img.shields.io/badge/null-safety-brightgreen)](https://dart.dev/null-safety)
+[![Gitter](https://img.shields.io/gitter/room/angel_dart/discussion)](https://gitter.im/angel_dart/discussion)
+[![License](https://img.shields.io/github/license/dart-backend/angel)](https://github.com/dart-backend/angel/tree/master/packages/model/LICENSE)
+
+The basic data models for Angel3 framework.
+
+```dart
+import 'package:angel3_model/angel3_model.dart';
+```
+
+The available data models are:
+
+* `Model` class
+  * A basic data model
+* `AuditableModel` class
+  * A basic data model with audit log feature

packages/model/analysis_options.yaml

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+
+include: package:lints/recommended.yaml

packages/model/example/main.dart

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+import 'package:platform_model/platform_model.dart';
+
+void main() {
+  var todo = Todo(id: '34', isComplete: false);
+  print(todo.idAsInt == 34);
+}
+
+class Todo extends Model {
+  String? text;
+
+  bool isComplete;
+
+  Todo(
+      {required String super.id,
+      this.text,
+      this.isComplete = false,
+      super.createdAt,
+      super.updatedAt});
+}

packages/model/lib/platform_model.dart

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+/// Represents a generic data model with an ID and timestamps.
+class Model {
+  /// A unique identifier corresponding to this item.
+  String? id;
+
+  /// The time at which this item was created.
+  DateTime? createdAt;
+
+  /// The last time at which this item was updated.
+  DateTime? updatedAt;
+
+  Model({this.id, this.createdAt, this.updatedAt});
+
+  /// Returns the [id], parsed as an [int].
+  int get idAsInt => id != null ? int.tryParse(id ?? "-1") ?? -1 : -1;
+
+  /// Returns the [id] or "" if null.
+  String get idAsString => id ?? "";
+}
+
+/// Represents a generic data model with audit log feature.
+class AuditableModel extends Model {
+  /// The authorized user who created the record.
+  String? createdBy;
+
+  /// The user who updated the record last time.
+  String? updatedBy;
+
+  AuditableModel(
+      {super.id,
+      super.createdAt,
+      this.createdBy,
+      super.updatedAt,
+      this.updatedBy});
+}

packages/model/pubspec.yaml

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+name: platform_model
+version: 9.0.0
+description: Angel3 basic data model class, no longer with the added weight of the whole framework.
+homepage: https://angel3-framework.web.app/
+repository: https://github.com/dart-backend/angel/tree/master/packages/model
+environment:
+  sdk: '>=3.3.0 <4.0.0'
+dev_dependencies:
+  lints: ^4.0.0