Question

我有一个包含2个字段的模型，这些字段具有到不同表的外键连接。他们有不同的名字，我无法弄清楚如何使关系发挥作用。

这是我的两个对象。 Visitor和Home Teams是我在建立之间关系时遇到的问题。

我得到的错误是：

“无法检索'Models.Game'的元数据类型'Models.Game'上属性VisitorID的ForeignKeyAttribute不是有效。在依赖项上找不到导航属性“团队” 输入'Models.Game'。名称值应该是有效的导航属性名“。

public class Team
{
    public Int64 TeamID { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Team Name")]
    public string Name { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "League Name")]
    [ForeignKey("League")]
    public Int64 LeagueID { get; set; }

    public virtual League League { get; set; }
}

public class Game
{
    public Int64 GameID { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Season Name")]
    [ForeignKey("Season")]
    public Int64 SeasonID { get; set; }

    public virtual Season Season { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [DataType(DataType.DateTime)]
    [Display(Name = "Game Time")]
    public DateTime Time { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Visitor Team")]
    [ForeignKey("Team")]
    public Int64 VisitorID { get; set; }

    public virtual Team Visitor { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Home Team")]
    [ForeignKey("Team")]
    public Int64 HomeID { get; set; }

    public virtual Team Home { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Rink")]
    [ForeignKey("Location")]
    public Int64 LocationID { get; set; }

    public virtual Location Location { get; set; }

    public virtual List<GameEvent> GameEvents { get; set; }
}

Answer 1

更改您的FK属性。它必须包含导航属性名称，而不是类型

[Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Visitor Team")]
    [ForeignKey("Visitor")]
    public Int64 VisitorID { get; set; }

Answer 2

经过几天的研究，我发现我在游戏模型中做错了什么。马丁说我需要使用导航属性是正确的。我还需要将[ForeignKey]属性放在引用属性而不是ID上。我已经列出了以下针对访客和家庭团队的更正代码

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Visitor Team")]               
    public Int64 VisitorID { get; set; }

    [ForeignKey("VisitorID")]
    public virtual Team Visitor { get; set; }

    [Required(ErrorMessage = "{0} is required")]
    [Display(Name = "Home Team")]        
    public Int64 HomeID { get; set; }

    [ForeignKey("HomeID")]
    public virtual Team Home { get; set; }

MVC 4外键属性

2 个答案: