在实体框架中一次将数据存储在两个表中

Question

我有三张桌子

1. 产品 { pid, pname, price }
2. 订单 { oid, odate }
3. OrderDetails { odid, oid, pid, qty, total }

我有一个表单，它在提交时会传递我想要存储在数据库中的 OrderDetails 数组。但这里的悲剧是我想同时将当前日期存储在 Order 表中。现在我的 Order 表中填充了 odate，但我的 orderdetails 表中没有插入任何内容。我正在使用 web api，并且在控制器中正确获取了数组。我猜这条线

aOrder.AllOrders.Add(od);

在控制器中必须用其他东西替换。

Order.cs

public class Order
{
    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int oid { get; set; }
    [DataType(DataType.DateTime)]
    public DateTime odate { get; set; }
    public virtual List<OrderDetail> AllOrders { get; set; }
    public Order()
    {
        AllOrders = new List<OrderDetail>();
    }
}

OrderDetail.cs

public class OrderDetail
{
    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int odid { get; set; }
    public int oid { get; set; }
    public virtual Order order { get; set; }
    public int pid { get; set; }
    public int qty { get; set; }
    public int total { get; set; }
    public virtual Product Aproduct { get; set; }
    public OrderDetail()
    {
        Aproduct = new Product();
    }
}

OrderDetailsController.cs

    private static readonly IOrderDetailRepository _orders = new OrderDetailRepository();

    public Order Post(List<OrderDetail> orderDetails)
    {
        Order aOrder = new Order();   
        foreach(OrderDetail orderDetail in orderDetails)
        {
            OrderDetail od = new OrderDetail();
            od.oid = orderDetail.oid;
            od.pid = orderDetail.pid;
            od.qty = orderDetail.qty;
            od.total = orderDetail.total;
            aOrder.AllOrders.Add(od);
        }
        aOrder.odate = DateTime.Now;
        return _orders.Add(aOrder);

    }

OrderDetailRepository.cs

    public Order Add(Order order)
    {
        _db.Orders.Add(order);
        _db.SaveChanges();
        return order;
    }

Answer 1

您能否尝试为 OrderDetails 指定外键：

public class OrderDetail
{
[ForeignKey("Order")]
public int oid { get; set; } //I'm guessing this is Order's PK