asp.net-core - 使用 Include 进行 EF Core 联接，但外键不是另一个表上的主键

Question

我正在尝试将我的表与另一端的外键和主键相关联。但现在我将使用外键，它不是所述表的主键。我正在使用[InverseProperty]，但我认为它有一个错误，因为我已经环顾四周几个小时了，而且所有人都说了同样的事情。

文档表:

public class Document
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int DocumentId { get; set; }
    public int ProjectId { get; set; }
    public int DepartmentId { get; set; }
    public int AuthorId { get; set; }

    [NotMapped]
    public virtual User Author { get; set; }
}

用户

public class User
{
    [Key]
    public int UserId { get; set; }
    public int AuthUserId { get; set; }
    public string DisplayName { get; set; }

    [NotMapped]
    [ForeignKey("AuthorId")]
    public virtual Document Document { get; set; }
}

上下文:

modelBuilder.Entity<User>(entity =>
        {
            entity.HasOne(u => u.Document)
            .WithMany("AuthorId");
        });

我正在尝试使用他们的解决方案 here ，但运气不佳。

任何帮助将不胜感激。谢谢!

Answer 1

But now i will be using a ForeignKey which is not the primary for the said table.

为此，您可以使用 EF Core Alternate Keys特征。但首先要更正您的模型类设置，如下所示:(正如您所说，User 将有多个Document)

public class Document
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int DocumentId { get; set; }
    public int ProjectId { get; set; }
    public int DepartmentId { get; set; }
    public int AuthorId { get; set; }

    public User Author { get; set; }
}

public class User
{
    [Key]
    public int UserId { get; set; }
    public int AuthUserId { get; set; }
    public string DisplayName { get; set; }


    public ICollection<Document> Documents { get; set; }
}

然后在Fluent API中配置如下:

modelBuilder.Entity<Document>()
        .HasOne(p => p.Author)
        .WithMany(b => b.Documents)
        .HasForeignKey(p => p.AuthorId)
        .HasPrincipalKey(b => b.AuthUserId); // <-- here you are specifying `AuthUserId` as `PrincipalKey` in the relation which is not primary key