followingRepository method
Implementation
@override
FollowingRepository? followingRepository(String? appId) {
if ((appId != null) && (_followingRepository[appId] == null)) {
_followingRepository[appId] = FollowingCache(FollowingFirestore(
() => appRepository()!.getSubCollection(appId, 'following'), appId));
}
return _followingRepository[appId];
}