EF6 Code First不映射我的M-0关系

Question

我希望能够输入SupplyPoint.SupplyPointMeters，而后者则是一个集合。 Code First已经创建了表并正确设置了外键，但我希望能够以这种方式访问​​SupplyPoint.SupplyPointMeters。

因此，在摘要SupplyPointMeter中，始终有SupplyPoint但SupplyPoint可以有0或更多SupplyPoint米。一切正常但我希望关系自动加入以支持点符号。

public partial class SupplyPointMeter
{
    [Key]
    public int SupplyPointMeterId { get; set; }
    public int SupplyPointId { get; set; }

    [Key,ForeignKey("SupplyPointId")]
    public virtual SupplyPoint SupplyPoint { get; set; }
}

public partial class SupplyPoint
{
    [Key]
    public int SupplyPointId { get; set; }

    public virtual ICollection<SupplyPointMeter> SupplyPointMeters { get; set; }
}

Answer 1

以这种方式试试。

public class SupplyPointMeter
{
    public int Id { get; set; }
    public virtual SupplyPoint SupplyPoint { get; set; }
}

public class SupplyPoint
{
    public int Id { get; set; }
    public virtual ICollection<SupplyPointMeter> SupplyPointMeters { get; set; }
}

Answer 2

我建议您使用fluent mapping：

modelBuilder.Entity<SupplyPoint>()
    .HasMany(sp => sp.SupplyPointMeters)
    .WithRequired(spm => spm.SupplyPoint)
    .HasForeignKey(spm => spm.SupplyPointId);

此外，您不需要标记密钥 - 如果密钥属性与type_name + id模式匹配，那么按惯例它将被视为关键：

public partial class SupplyPointMeter
{        
    public int SupplyPointMeterId { get; set; }
    public int SupplyPointId { get; set; }
    public virtual SupplyPoint SupplyPoint { get; set; }
}

public partial class SupplyPoint
{
    public int SupplyPointId { get; set; }
    public virtual ICollection<SupplyPointMeter> SupplyPointMeters { get; set; }
}

这会生成以下表格