clientSellDeferredBeforeDate method
Implementation
num clientSellDeferredBeforeDate(int herderId, DateTime date) {
final list = where((t) => t.contactIdString == herderId.toString())
.where((t) => t.status)
.where((t) => t.date.isBefore(date))
.where((t) => t.ticketType == TicketType.sellDeferred);
return list.fold(0.0, (prev, e) => prev + e.totalPriceTaxAndPromoIncluded);
}