bookletRepository method
Implementation
@override
BookletRepository? bookletRepository(String? appId) {
if ((appId != null) && (_bookletRepository[appId] == null)) {
_bookletRepository[appId] = BookletCache(BookletFirestore(
() => appRepository()!.getSubCollection(appId, 'booklet'), appId));
}
return _bookletRepository[appId];
}