private async Task <bool> ConditionMet(FlightPurchaseDto flightPurchase, Domain.Entities.PriceDiscount discount)
        {
            var purchases = new List <FlightPurchaseDto>();

            purchases.Add(flightPurchase);
            var query = purchases.AsQueryable();

            var queryString = string.Empty;

            queryString = await BuildQueryString(discount, queryString);

            if (string.IsNullOrEmpty(queryString) || query.Where(queryString).Any())
            {
                return(true);
            }

            return(false);
        }
        private async Task CheckConditionsAndApply(Domain.Entities.PriceDiscount discount, FlightPurchaseDto purchaseDto, Domain.Entities.FlightPurchase purchase)
        {
            // minimalna cena 20
            if (purchase.Price - 5 < 20)
            {
                return;
            }

            if (await ConditionMet(purchaseDto, discount))
            {
                purchase.Price -= 5;

                // zapis zniżek dla danej grupy
                if (purchaseDto.TenantGroup == Domain.Enums.TenantGroup.A)
                {
                    purchase.Discounts.Add(discount);
                }
            }
        }