如何映射两个一或零到一的关系

Question

我有三个实体，名称分别为 SellinRequest、MortgageAndRent 和 Album。 SellinRequest 和 MortgageAndRent 中的每一个都可能有一个相册。

public class SellingRequest
{
    public int Id { get; set; }
    public Album Album { get; set; }  
}

public class MortgageAndRent
{
    public int Id { get; set; } 
    public Album Album { get; set; }
}

public class Album
{
    public int Id { get; set; }
    public SellingRequest SellingRequest { get; set; }
    public int SellingRequestId { get; set; }

    public MortgageAndRent MortgageAndRent { get; set; }
    public int MortgageAndRentId { get; set; }

    public List<Photo> Photos { get; set; }
}

这是我要实现的逻辑：

• （SellingRequest 1 .... 0-1 专辑）
• （MortgageAndRent 1 .... 0-1 专辑）

使用这些映射：

public class SellingRequestMap : EntityTypeConfiguration<SellingRequest>
{
    public SellingRequestMap()
    {
        this.ToTable("SellingRequest");
        this.HasKey(sR => sR.Id);

        // Each SellingRequest may have one Album. (SellingRequest 1 .... 0-1 Album)
        this.HasOptional(sR => sR.Album).WithOptionalPrincipal(a => a.SellingRequest).WillCascadeOnDelete(false);
    }
}

public RentAndMortgageMap()
    {
        this.ToTable("MortgageAndRent");
        this.HasKey(mR=>mR.Id);

        // Each MortgageAndRent may have one Album. (MortgageAndRent 1 .... 0-1 Album)
        this.HasOptional(sM => sM.Album).WithOptionalPrincipal(a => a.MortgageAndRent).WillCascadeOnDelete(false);
    }

但我无法得到结果。我不知道如何将这两个表关联到专辑表！

Answer 1

以下是我在不使用 fleunt 语法的情况下的做法。请注意新的 id 字段，并且我将专辑属性标记为 virtual

public class SellingRequest
{
    public int Id { get; set; }
    public int AlbumId {get;set;}

    public virtual Album Album { get; set; }  
}

public class MortgageAndRent
{
    public int Id { get; set; } 
    public int AlbumId {get;set;}

    public virtual Album Album { get; set; }
}

public class Album
{
    public int Id { get; set; }

    public int SellingRequestId { get; set; }   
    public int MortgageAndRentId { get; set; }

    public virtual SellingRequest SellingRequest { get; set; }
    public virtual MortgageAndRent MortgageAndRent { get; set; }

    public virtual List<Photo> Photos { get; set; }
}