/// <summary>
        /// Domyślne pobieranie danych z tabeli Komentarzy
        /// </summary>
        /// <returns></returns>
        public static CommentsViewModel GetDefault()
        {
            lock (typeof(CommentsViewModel))
            {
                if (defaultInstance == null)
                {
                    defaultInstance = new CommentsViewModel();
                }
            }

            return(defaultInstance);
        }
        /// <summary>
        /// Pobranie komentarza dla danego Id Produktu
        /// </summary>
        /// <param name="deviceId"></param>
        /// <returns></returns>
        public static CommentsViewModel GetForDeviceId(long deviceId)
        {
            lock (typeof(CommentsViewModel))
            {
                if (instances.ContainsKey(deviceId) != true)
                {
                    instances[deviceId] = new CommentsViewModel(deviceId);
                }
            }

            return(instances[deviceId]);
        }