YourLocation and some persist work

lib/yourLocation.dart

@@ -0,0 +1,78 @@
+import 'package:bson_objectid/bson_objectid.dart';
+import 'package:flutter/material.dart';
+import 'package:json_annotation/json_annotation.dart';
+import 'package:pref_dessert/pref_dessert.dart';
+import 'dart:convert';
+
+part 'yourLocation.g.dart';
+
+_objectIdFromJson(String json) {
+  return new ObjectId.fromHexString(json);
+}
+
+_objectIdToJson(ObjectId o) {
+  return o.toString();
+}
+
+@JsonSerializable(nullable: false)
+class YourLocation extends Object with _$YourLocationSerializerMixin {
+  @JsonKey(toJson: _objectIdToJson, fromJson: _objectIdFromJson)
+  ObjectId id;
+  final double lat;
+  final double lon;
+  String description;
+  bool subscribed;
+
+  factory YourLocation.fromJson(Map<String, dynamic> json) =>
+      _$YourLocationFromJson(json);
+
+  static YourLocation noLocation = new YourLocation(lat: 0.0, lon: 0.0);
+
+  YourLocation(
+      {this.id,
+      @required this.lat,
+      @required this.lon,
+      this.description,
+      this.subscribed: false}) {
+    if (this.description == null)
+      this.description = 'Position: ${this.lat}, ${this.lon}';
+    if (this.id == null) this.id = new ObjectId();
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is YourLocation &&
+          runtimeType == other.runtimeType &&
+          id == other.id &&
+          lat == other.lat &&
+          lon == other.lon &&
+          description == other.description &&
+          subscribed == other.subscribed;
+
+  @override
+  int get hashCode =>
+      id.hashCode ^
+      lat.hashCode ^
+      lon.hashCode ^
+      description.hashCode ^
+      subscribed.hashCode;
+}
+
+class YourLocationRepository extends PreferencesRepository<YourLocation> {
+
+  static final repo = new YourLocationRepository();
+
+  YourLocationRepository() : super();
+
+  @override
+  YourLocation deserialize(String s) {
+
+    return YourLocation.fromJson(json.decode(s));
+  }
+
+  @override
+  String serialize(YourLocation y) {
+    return json.encode(y.toJson());
+  }
+}