func fetchMonument(request: AboutMonument.FetchMonument.Request,
                            completion: @escaping (Monument?, AppError?) -> ()) {
        let query = BeaconParse.query()
        query?.whereKey("major", equalTo: request.major)
            .whereKey("minor", equalTo: request.minor)
        query?.getFirstObjectInBackground { (object, error) in
            if let error = error {
                print(error.localizedDescription)
                completion(nil, AppError(with: error))
                return
            }
            guard let beacon = object as? BeaconParse else {
                print("Something went wrong when monument list was fetched.")
                completion(nil, AppError(with: error))
                return
            }
            print(beacon)
            self.getMonument(with: beacon, completion: completion)
        }
    }

    private func getMonument(with beacon: BeaconParse,
                             completion: @escaping (Monument?, AppError?) -> ()) {
        let monumentQuery = Monument.query()
        guard let beaconId = beacon.objectId else { return }
        monumentQuery?.whereKey("beaconId", equalTo: beaconId)
        monumentQuery?.getFirstObjectInBackground { (object, error) in
            if let error = error {
                print(error.localizedDescription)
                completion(nil, AppError(with: error))
                return
            }
            guard let monument = object as? Monument else {
                print("Something went wrong when monument list was fetched.")
                completion(nil, AppError(with: error))
                return
            }
            print(monument)
            completion(monument, nil)
        }
    }