Question

我在NETCore上预订申请预订与入住率有一对多的关系两种型号都具有导航属性似乎外键（OccupancyId）未在Booking中设置。

编辑：以下代码似乎运行正常。

Occupancy newOccupancy = new Occupancy { AccommodationId = 12, DateIn = new DateTime(2017, 1, 18), DateOut = new DateTime(2017, 2, 18) };
ApplicationDbContext.Occupancies.Add(newOccupancy);
Booking newBooking = new Booking { AccommodationId = 12, BookingStatusId = 6, Capacity = 69, OccupancyId = newOccupancy.Id, Paid = true, ProfileId = 1, Remark = "Geen", Total = 0 };
ApplicationDbContext.Bookings.Add(newBooking);

但是，当使用此代码时，它似乎不再起作用

ApplicationDbContext.Occupancies.Add(model.Occupancy);
ApplicationDbContext.Bookings.Add(model.Booking);

在BookingController中创建方法

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(CityViewModel model)
{
    var alert = new Alert();
    try
    {
        if(!ModelState.IsValid) {
            alert.Message = alert.ExceptionMessage = ApplicationDbContextMessage.INVALID;
            throw new Exception();
        }

        Occupancy newOccupancy = new Occupancy { AccommodationId = 12, DateIn = new DateTime(2017, 1, 18), DateOut = new DateTime(2017, 2, 18) };
        ApplicationDbContext.Occupancies.Add(newOccupancy);
        Booking newBooking = new Booking { AccommodationId = 12, BookingStatusId = 6, Capacity = 69, OccupancyId = newOccupancy.Id, Paid = true, ProfileId = 1, Remark = "Geen", Total = 0 };
        ApplicationDbContext.Bookings.Add(newBooking);

        if (await ApplicationDbContext.SaveChangesAsync() == 0)
        {
            alert.Message = alert.ExceptionMessage = ApplicationDbContextMessage.CREATENOK;
            throw new Exception();
        }  

        alert.Message = ApplicationDbContextMessage.CREATEOK;
        alert.Type = AlertType.Success;
        AddAlert(alert);

        return RedirectToAction("Index");
    }
    catch(Exception ex)
    {
        alert.Type = AlertType.Error;
        alert.ExceptionMessage = ex.Message;
        //AddAlert(alert);

        model = await ViewModel(model.City);
        ModelState.AddModelError(string.Empty, alert.ExceptionMessage);
    }
    return View(model);
}

BookingViewModel

public class BookingViewModel
{
    public Booking Booking { get; set; }
    public List<SelectListItem> Accommodations { get; set; }
    public List<SelectListItem> BookingStatuses { get; set; }
    public Occupancy Occupancy { get; set; }
}

占用模型

public class Occupancy : BaseEntity<Int64>
{
    public DateTime DateIn { get; set; }
    public DateTime DateOut { get; set; }
    public OccupancyType OccupancyType { get; set; }

    public Int64 AccommodationId { get; set; }
    public Accommodation Accommodation { get; set; }
    public Booking Booking { get; set; }
}

预订模式

public class Booking : BaseEntity<Int64>
{
    public int Capacity { get; set; }
    public bool Paid { get; set; }
    public Decimal Total { get; set; }
    public string Remark { get; set; }

    public Int64 ProfileId { get; set; }
    public Profile Profile { get; set; }
    public Int64 AccommodationId { get; set; }
    public Accommodation Accommodation { get; set; }
    public Int64 OccupancyId { get; set; }
    public Occupancy Occupancy { get; set; }
    public Int64 BookingStatusId { get; set; }
    public BookingStatus BookingStatus { get; set; }
}

Answer 1

这可能会有所帮助： http://www.entityframeworktutorial.net/code-first/foreignkey-dataannotations-attribute-in-code-first.aspx

您的密钥可以通过使用数据注释来定义，并将虚拟关键字放在国家/地区的前面，如下所示：

[ForeignKey("Country")]
public Int16 CountryID { get; set; }
public virtual Country Country { get; set; }

您还需要添加using System.ComponentModel.DataAnnotations.Schema;。

Answer 2

我似乎已经通过在我的控制器中使用它解决了这个问题

ApplicationDbContext.Occupancies.Add(model.Occupancy);
model.Booking.OccupancyId = model.Occupancy.Id;
ApplicationDbContext.Bookings.Add(model.Booking);

所以我认为导航属性出了问题，不确定是什么，但这似乎暂时解决了问题。

在单独的表EF Core中插入2个项目

2 个答案: