Default FireStore listener

FireStoreQuery.swift

        
        self.albumQuery()
            .order(by: "title", descending: true)
            .getDocuments { (querySnapshot, error) in
                if let err = error {
                    debugPrint("Error fetching documents \(err)")
                }
                else {
                    guard let documentSnapshot = querySnapshot else { return }

                    // Map [Album]
                    self.albums = documentSnapshot.documents.compactMap({ Album(dictionary: $0.data(), reference: $0.reference) })
                }
        }