Question

我有3个模型：Order，Organization和OrderOrganisation。

订单将始终存在，组织也将如此，但OrderOrganisation的存在不是强制性的。

一个订单可以与许多组织相关，这是将该信息标题化的记录。

我无法更改数据库结构。

以下是我的模特。

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

    public virtual ICollection<OrderOrganisation> OrderOrganisations { get; set; }
}

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

    public virtual ICollection<OrderOrganisation> OrderOrganisations { get; set; }
}

public class OrderOrganisation
{
    [Key, Column(Order = 0)]
    public int OrderId { get; set; }

    [Key, Column(Order = 1)]
    public int OrganisationId { get; set; }

    [ForeignKey("OrderId")] //this is not right, i get an inner join not an outer join
    public virtual Order Order { get; set; }

    [ForeignKey("OrganisationId")] //this is not right, i get an inner join not an outer join
    public virtual Organisation Organisation { get; set; }
}

我知道我需要在上下文中添加一些内容，但我无法解决问题？

由于

Answer 1

//try this
public class Order
{
    [Key]
    public int Id { get; set; }
    public virtual ICollection<OrderOrganisation> OrderOrganisations { get; set; }
}

public class Organisation
{
    [Key]
    public int Id { get; set; }
    public virtual ICollection<OrderOrganisation> OrderOrganisations { get; set; }
}

public class OrderOrganisation
{
    [ForeignKey("Order"), Column(Order = 0)]
    public int? OrderId { get; set; }

    [ForeignKey("Organisation"), Column(Order = 1)]
    public int? OrganisationId { get; set; }

    [ForeignKey("OrderId")]
    public virtual Order Order { get; set; }
    [ForeignKey("OrganisationId")]
    public virtual Organisation Organisation { get; set; }
}

如何定义具有组合键的非强制记录

1 个答案: