protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity <AvailableTickets>().HasData(Seed.AvailableTickets());
var reservedTicketEntity = modelBuilder.Entity <ReservedTicket>();
var reservationEntity = modelBuilder.Entity <Reservation>();
reservedTicketEntity
.HasOne <Reservation>()
.WithMany(r => r.ReservedTickets)
.IsRequired()
.HasForeignKey(so => so.ReservationId)
.OnDelete(DeleteBehavior.Cascade);
var orderedTicketEntity = modelBuilder.Entity <OrderedTicket>();
var orderEntity = modelBuilder.Entity <Order>();
orderedTicketEntity
.HasOne <Order>()
.WithMany(r => r.OrderedTickets)
.IsRequired()
.HasForeignKey(so => so.OrderId)
.OnDelete(DeleteBehavior.Cascade);
base.OnModelCreating(modelBuilder);
}