Question

我花了一些时间来构建我的域模型（使用EF CTP5 Code First），现在我想我会通过一些测试数据看看是否一切正常。不幸的是，似乎我的应用程序加载了除了在运行时期间没有被捕获的错误，因为一切都完美编译。无论如何，我一直收到以下错误：

保存时发生错误不暴露外国的实体他们的关键属性关系。

这是内在的例外：

“INSERT语句与...发生冲突 FOREIGN KEY约束 \ “Item_ItemStatus \”。冲突发生在数据库“CFSharwe”中， table \“dbo.ItemStatus \”，列 'Id'。\ r \ n声明已经发布终止“。

我不知道为什么会这样。我怀疑这可能是由我的初始化类引起的，我在其中加载了Seed（）方法中数据库的所有静态内容。所以我评论了我添加ItemStatuses的部分，我仍然遇到了同样的错误。而且，我应该在编译时得到这个，而不是在运行时，不是吗？

下面是ItemStatus类和我测试数据的一部分：

public class ItemStatus
{
 public int Id { get; set; }
 public string Description { get; set; }
 public ICollection<Item> Items { get; set; }
}

//Test data inside the Index() method of the ItemsController
var item2 = new Item
  {
   Title = "iPhone 4",
   Description = "Lorem Ipsum is simply",
   StartingPrice = 400f,
   User = user2,
   Status = 1,
   EndDate = DateTime.Now.AddDays(10),
   StartDate = DateTime.Now,
   BidIncrement = 3f,
   Bids = new List<Bid>(),
   Comments = new List<Comment>(),
   //ItemStatus = _itemsService.GetItemStatusById(1),    
   ViewingUsers = new List<User>(),
   WatchingUsers = new List<User>(),
   Tags = new List<Tag>()
  };
  //here's where I save the data to the database
  var category = _categoryService.GetChildByName(categoryName);
  category.Items.Add(item2);
  _categoryService.Save();

更新：（Slauma请求）

public class Item
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public float StartingPrice { get; set; }
    public float? BidIncrement { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public int Status { get; set; }
    [ForeignKey("Status")]
    public virtual ItemStatus ItemStatus { get; set; }
    public virtual Address PickupAddress { get; set; }
    public virtual User User { get; set; }
    public virtual ChildCategory Category { get; set; }
    public virtual ICollection<Comment> Comments { get; set; }
    public virtual ICollection<Image> Images { get; set; }
    public virtual ICollection<Bid> Bids { get; set; }
    public virtual ICollection<User> WatchingUsers { get; set; }
    public virtual ICollection<User> ViewingUsers { get; set; }
    public virtual ICollection<Tag> Tags { get; set; }
    //public virtual ItemRating Rating { get; set; }

    public bool IsValidBidAmount(int amount)
    {
        if (amount <= this.Bids.Max(a => a.Amount))
            return false;

        return true;
    }

    public bool IsClosed()
    {
        if (this.ItemStatus.Id.Equals(3))
            return true;
        return false;
    }

    public bool IsPending()
    {
        if (ItemStatus.Id.Equals(2))
            return true;
        return false;
    }

    public bool IsPublished()
    {
        if (ItemStatus.Equals(1))
            return true;
        return false;
    }

    public int WinnerId()
    {
        if(IsClosed())
        {
            User highestBidder = null;
            foreach (Bid b in Bids)
            {
                if (b.Amount.Equals(HighestBid()))
                    highestBidder = b.User;
            }
            if (highestBidder != null) return highestBidder.Id;
        }
        return 0;
    }

    public float HighestBid()
    {
        return Bids.Max(u => u.Amount);
    }

    public string MainImageLink()
    {
        var mainImage = Images.Single(i => i.Rank.Equals(0));
        return mainImage.Path;
    }

    public string FirstTag()
    {
        return Tags.First().Title;
    }
}

更新2：

public class UnitOfWork : IUnitOfWork
{
    private readonly IDatabaseFactory _databaseFactory;
    private DbContext _context;
    public UnitOfWork(IDatabaseFactory dbFactory)
    {
        _databaseFactory = dbFactory;
    }

    protected DbContext DataContext
    {
        get
        {
            return _context ?? (_context = _databaseFactory.GetDbContext());
        }
    }

    public void Commit()
    {
        DataContext.SaveChanges();
    }
}

public class EfDatabaseFactory : IDisposable, IDatabaseFactory
{
    private SharweEntities _dbContext;


    public DbContext GetDbContext()
    {
        return _dbContext ?? (_dbContext = new SharweEntities());
    }

    public System.Data.Objects.ObjectContext GetObjectContext()
    {
        return _dbContext.ObjectContext;
    }

    public void Dispose()
    {
        if (_dbContext != null)
            _dbContext.Dispose();
    }
}

有关此事的任何想法？提前谢谢。

Answer 1

我认为错误表明您的数据库中没有Id = 1的ItemStatus记录。

对于不为其关系公开外键属性的实体出错

1 个答案: