通过连接表进行多对多自连接

我有一个EF模型，它可以通过一个中间类自引用来定义父/子关系。我知道如何使用Map命令实现纯多对多关系，但是由于某种原因，通过这个中间类会导致映射出现问题。中间类为关系提供了额外的属性。请参阅下面的类、modelBinder逻辑和错误:

public class Equipment
{        
    [Key]
    public int EquipmentId { get; set; }
    public virtual List<ChildRecord> Parents { get; set; }
    public virtual List<ChildRecord> Children { get; set; }
}
public class ChildRecord
{
    [Key]
    public int ChildId { get; set; }
    [Required]
    public int Quantity { get; set; }
    [Required]
    public Equipment Parent { get; set; }
    [Required]
    public Equipment Child { get; set; }
}

我尝试在两个方向上构建映射，尽管我一次只保留一个集合:

        modelBuilder.Entity<ChildRecord>()
            .HasRequired(x => x.Parent)
            .WithMany(x => x.Children )
            .WillCascadeOnDelete(false);
        modelBuilder.Entity<ChildRecord>()
            .HasRequired(x => x.Child)
            .WithMany(x => x.Parents)
            .WillCascadeOnDelete(false);

或

        modelBuilder.Entity<Equipment>()
            .HasMany(x => x.Parents)
            .WithRequired(x => x.Child)
            .WillCascadeOnDelete(false);
        modelBuilder.Entity<Equipment>()
            .HasMany(x => x.Children)
            .WithRequired(x => x.Parent)
            .WillCascadeOnDelete(false);

无论我使用哪一组，当我尝试将我的ef模型部署到数据库时，我得到错误:The foreign key component 'Child' is not a declared property on type 'ChildRecord'. Verify that it has not been explicitly excluded from the model and that it is a valid primitive property.。

如果我在没有modelBinder逻辑的情况下构建它，那么在我的ChildRecord表中，我将得到Child的两个ID列和Parent的两个ID列。这是有意义的，因为它试图从设备自动创建导航属性，而不知道在ChildRecord中已经有属性来满足这个需求。

我尝试在类上使用数据注释，没有modelBuilder代码，这失败了与上面相同的错误:

    [Required]
    [ForeignKey("EquipmentId")]
    public Equipment Parent { get; set; }
    [Required]
    [ForeignKey("EquipmentId")]
    public Equipment Child { get; set; }

和

    [InverseProperty("Child")]
    public virtual List<ChildRecord> Parents { get; set; }
    [InverseProperty("Parent")]
    public virtual List<ChildRecord> Children { get; set; }

我看过互联网上的各种其他答案/SO，共同的区别似乎是我自己加入，因为我能找到的所有答案都是针对两种不同的类型。

• 实体框架代码先多对多设置现有表
• 实体框架中连接表的多对多关系?
• 在实体框架中创建多对多连接表

public class Equipment
{
    [Key]
    public int EquipmentId { get; set; }
    public virtual List<EquipmentRelation> Parents { get; set; }
    public virtual List<EquipmentRelation> Children { get; set; }
}
public class EquipmentRelation
{
    [Key]
    [Column("ChildId", Order=1)]
    public int ChildId { get; set; }
    [Key]
    [Column("ParentId", Order=2)]
    public int ParentId { get; set; }
    [Required]
    public int Quantity { get; set; }
    [Required]
    public Equipment Parent { get; set; }
    [Required]
    public Equipment Child { get; set; }
}