public double GetDiscountedPrice(CustomerAfter customerAfter) => 0.0;
public void RemoveCustomer(CustomerAfter arg)
{
arg.FriendOrders().Remove(this);
_customers.Remove(arg);
}
public void SetCustomer(CustomerAfter arg)
{
Customer?.FriendOrders().Remove(this);
Customer = arg;
Customer?.FriendOrders().Add(this);
}
public void AddCustomer(CustomerAfter arg)
{
arg.FriendOrders().Add(this);
_customers.Add(arg);
}