getGetterSetterMap method
Implemented by subclasses to map the getters and setters of the object.
Cannot have keys that have the values TYPE or ID
Implementation
@override
Map<String, Tuple2<Getter, Setter>> getGetterSetterMap() => {
"updated": Tuple2(() => updated, (val) => updated = val),
"lastUpdated": GenericModel.dateTime(
() => lastUpdated, (value) => lastUpdated = value!),
"collection": GenericModel.model(() => collectionModel,
(value) => collectionModel = value, BookmarkCollectionModel.new),
};