public void Insert(Serving entity)
        {
            List <Serving> servings = GetJsonData();

            servings.Add(entity);
            UpdateJsonData(servings);
        }
        public void Update(Serving entity)
        {
            List <Serving> servings = GetJsonData();
            int            index    = servings.FindIndex(s => s.Id == entity.Id);

            servings[index] = entity;
            UpdateJsonData(servings);
        }