在這個上下文中只支持原始類型或枚舉錯誤，同時在多個字段上使用AddOrUpdate匹配播種ASP.NET MVC

Question

我在stackoverflow.com上的第一個問題！祝我好運:)解釋

我試圖用種子一些測試數據的開發數據庫，​​需要兩個領域的匹配，並在這裏遇到解決How to seed data with AddOrUpdate with a complex key in EF 4.3

我得到Only primitive types or enumeration types are supported in this context.錯誤as mentioned in the comments by lukyer問題。

但是，儘管按照他的建議添加了外鍵屬性和模型屬性的必需屬性，但我找不到明顯的方法來清除錯誤。

有關如何成功創建數據庫的任何想法都會非常感激。

模型的重要組成部分如下：

public class User { 
    public string ID { get; set; } 
    public string Email {get; set; } 
} 

public class Institution { 
    public Guid ID { get; set;} 
    public string Name {get; set; } 
} 

public class UserInstitutionAssociation { 
    public Guid ID { get; set; } 
    public virtual User User { get; set; } 
    public virtual Institution Institution {get; set;} 
} 

然後將代碼從configuration.cs遷移增加了一個用戶（jamesbond@mi5.com）和機構（絕密建立）。然後，它嘗試在用戶和企業之間添加關聯，只有在這兩者之間的關聯尚不存在的情況下，才應該添加關聯。

//Add User to Database 
context.Users.AddOrUpdate(u => u.Email, 
    new User { 
     Email = "jamesbond@mi5.com" 
    }); 
context.SaveContext(); 

//Add Institution to Database 
context.Institutions.AddOrUpdate(u => u.Name, 
    new Institution { 
     Name = "Top Secret Establishment" 
    }); 
context.SaveContext(); 

//Add Association between User and Institution 
context.InstitutionUserAssociations.AddOrUpdate(u => new { u.User, u.Institution }, 
    new InstitutionUserAssociation 
    { 
     User = context.Users.Single(x => x.Email=="jamesbond@mi5.com"), 
     Institution = context.Institutions.Single(x => x.Name=="Top Secret Establishment") 
    } 
); 
context.SaveContext(); 

我試圖改變在許多方面的模型，因爲我明白Lukyer已經建議，包括在這裏How Should I Declare Foreign Key Relationships Using Code First Entity Framework (4.1) in MVC3?

描述總之所有的解決方案，我曾嘗試沒有成功以下的所有組合：

public class UserInstitutionAssociation { 
    public Guid ID { get; set; } 
    [Required] 
    [ForeignKey("UserID")] 
    public virtual User User { get; set; } 
    [Required] 
    [ForeignKey("InstitutionID")] 
    public virtual Institution Institution {get; set;} 
} 

和

public class UserInstitutionAssociation { 
    public Guid ID { get; set; } 
    [Required] 
    [ForeignKey("User")] 
    public string UserID {get; set; } 
    public virtual User User { get; set; } 

    [Required] 
    [ForeignKey("Institution")] 
    public Guid InstitutionID { get; set; } 
    public virtual Institution Institution {get; set;} 
} 

Answer 1

解決。發生是因爲我將其作爲LINQ查詢的一部分包含在類中。您不能使用x => new { x.User, x.Institution}，因爲x.User和x.Institution都是複雜的類。相反，這些需要是基本的基本類型（如字符串或Guid）。它以這種方式改變了AddOrUpdate(x => new {x.UserID, x.InstitutionID}, Associations)。該模型需要進行更改，以便包含可由LINQ查詢的名爲UserID和InstitutionID的屬性。

我調整UserInstitutionAssociation代碼如下所以它包括屬性稱爲用戶ID和InstitutionID以及用戶和I：

public class UserInstitutionAssociation { 
    public Guid ID { get; set; } 

    [Required] 
    [ForeignKey("User")] 
    public string UserID {get; set; } 
    public virtual User User { get; set; } 

    [Required] 
    [ForeignKey("Institution")] 
    public Guid InstitutionID { get; set; } 
    public virtual Institution Institution {get; set;} 
} 

然後調整AddOrUpdate呼叫如下：

//Add Association between User and Institution 
context.InstitutionUserAssociations.AddOrUpdate(u => new { u.UserID, u.InstitutionID }, 
    new InstitutionUserAssociation 
    { 
     User = context.Users.Single(x => x.Email=="jamesbond@mi5.com"), 
     Institution = context.Institutions.Single(x => x.Name=="Top Secret Establishment") 
    } 
);