saveObjects<T extends VasatModel<T>> method

@override Future<bool> saveObjects<T extends VasatModel<T>>(List<T> objects)

Implementation

@override
Future<bool> saveObjects<T extends VasatModel<T>>(List<T> objects) {
  return SharedPreferences.getInstance().then((prefs) {

    // Get first object to determine the vasat object name
    String objName = objects.first.getObjectName();
    // Get already stored object list as a Map<String,Object> where key is the id
    var objs = prefs.getString(objName);
    Map<String,dynamic> objsMap = {};
    if (objs != null) objsMap = jsonDecode(objs);
    // generate new list of Map objects
    Map<String,dynamic> newObjsMap = {};
    objects.forEach((element) {
      String uid = (element.id == null) ? generateUID(T) : element.id!;
      if (element.id == null) element.id = uid;
      newObjsMap[uid] = element.toJson();
    } );

    // Concatenate both maps replacing values on old Map with new Map if keys/id are already present.
    objsMap.addAll(newObjsMap);

    return prefs.setString( objName , jsonEncode(objsMap));
  });
}