无法确定关系的原则结束 - 多个添加的实体可能具有相同的主键 [英] Unable to determine the principle end of the relationship - multiple added entities may have the same primary key

问题描述

套有卡和套。这是我在我的模型中使用EF代码第一：

Sets have Cards and Sets. Here's what I have in my model, using EF Code First:

public class Set
{
    // Primitive Properties 
    [Required]
    [Key]
    public virtual int SetId { get; set; }

    // Navigation Properties 
    [Required]
    public virtual List<Set> Sets { get; set; }

    // Navigation Properties
    [ForeignKey("ParentSet")]
    public int ParentSetId { get; set; }
    public virtual Set ParentSet { get; set; }
}

然后为卡片：

public class Card
{
    // Primitive Properties
    [Required]
    [Key]
    public virtual int CardId { get; set; }

    // Navigation Properties
    [Required]
    [ForeignKey("ParentSet")]
    public int ParentSetId { get; set; }
    public virtual Set ParentSet { get; set; }
}

我正在尝试使用'update-database'从包管理器控制台，这是我得到的错误：

I'm trying to rebuild the database using 'update-database' from the package manager console and this is the error I'm getting:

无法确定
'应用程序的主体端.Core.Set_ParentSet'关系。多个添加的实体
可能具有相同的主键。

Unable to determine the principal end of the 'App.Core.Set_ParentSet' relationship. Multiple added entities may have the same primary key.

任何想法为什么？

推荐答案

对于在Set实体中拥有这一点，我没有意义。它不能引用自己并被要求

To me having this in the Set entity doesn't make sense. It can't refer to itself and be required

// Navigation Properties 
[Required]
public virtual List<Set> Sets { get; set; }

如果一个 Set 有一个列表设置，你如何创建第一个 Set ？

If a Set HAS to have a list of Sets, how can you create the first Set?

请注意，从错误中写出的内容与卡类无关。

Note that from what's written in the error, it has nothing to do with the Card class

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