void OnNew(object param)
        {
            Id      = Guid.Empty;
            Date    = DateTime.Today;
            Details = new ObservableCollection <EggProductionDetailViewModel>();

            var activeHouses = HenHouses.Where(e => e.Active).ToList();

            foreach (var house in activeHouses)
            {
                var detail = new EggProductionDetailViewModel
                {
                    HouseId   = house.Id,
                    FeedTotal = usageService.GetDailyFeedAmount(house.Id, Date)
                };

                Details.Add(detail);
            }
        }
        void OnNew(object param)
        {
            Id = Guid.Empty;
            Date = DateTime.Today;
            Details = new ObservableCollection<EggProductionDetailViewModel>();

            var activeHouses = HenHouses.Where(e => e.Active).ToList();
            foreach (var house in activeHouses)
            {
                var detail = new EggProductionDetailViewModel
                {
                    HouseId = house.Id,
                    FeedTotal = usageService.GetDailyFeedAmount(house.Id, Date)
                };

                Details.Add(detail);
            }
        }