實體框架代碼首先覆蓋TPM繼承onModelCreating（）繼承擰緊身份用戶和角色模型

Question

我有問題將Fluent API擴展到我的繼承類。我採用了TPT（table per type）方法，並且每種類型的繼承都有一個表。我喜歡每種類型的表格，因爲數據庫完全標準化並易於維護。我收到一個錯誤信息，說明article指示我做的onModelCreating方法。它正在失去用戶和角色實體的密鑰。

抽象基類

namespace Home_Warranty.Models 
{ 
    public abstract class Vendor 
    { 
     [Key] 
     public int VendorID { get; set; } 

     [Required] 
     public string CompanyName { get; set; } 

     [Required] 
     public int StreetNumber { get; set; } 

     [Required] 
     public string StreetName { get; set; } 

     } 
} 

繼承ServiceCompany類從供應商

namespace Home_Warranty.Models 
{ 
[Table("ServiceCompanies")] 
public class ServiceCompany : Vendor 
{ 
    public string ACHClaim { get; set; } 

    public virtual ICollection<SubContractorCompany> SubContractorCompanies{ get; set; } 

    public virtual ICollection<ServiceCompanyUser> SubContractorUsers { get;set; } 
    } 
} 

當我加入了實體模型，以便能夠與onModelCreating()

public class ApplicationDbContext : IdentityDbContext<ApplicationUser> 
{ 
    public ApplicationDbContext() 
     : base("DefaultConnection", throwIfV1Schema: false) 
    { 
    } 

    public DbSet<Vendor> Vendors { get; set; } 


    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 
     modelBuilder.Entity<ServiceCompany>().ToTable("ServiceCompanies"); 

    } 


    public static ApplicationDbContext Create() 
    { 
     return new ApplicationDbContext(); 
    } 
} 

，我發現了流利的API更新數據庫時在遷移時出現以下錯誤。這絕對是因爲我過度使用onCreateModel函數。

at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command) 
One or more validation errors were detected during model generation: 
Home_Warranty.Models.IdentityUserLogin: : EntityType 'IdentityUserLogin' has no key defined. Define the key for this EntityType. 
Home_Warranty.Models.IdentityUserRole: : EntityType 'IdentityUserRole' has no key defined. Define the key for this EntityType. 
IdentityUserLogins: EntityType: EntitySet 'IdentityUserLogins' is based on type 'IdentityUserLogin' that has no keys defined. 
IdentityUserRoles: EntityType: EntitySet 'IdentityUserRoles' is based on type 'IdentityUserRole' that has no keys defined. 

1. 這似乎並不像處理這一問題的最佳途徑。我可以在其他地方添加此代碼，並獲得我想要的實際結果而無需搞亂用戶和角色模型？
2. 我希望能夠通過流暢的API來做到這一點。

var ListofServiceCompanies = db.ServiceCompanies.All()

，或者我應該只是經過供應商實體呢？

var ListofServiceCompanies = db.Vendor.SelectMany(Vendor is a ServiceComapny...etc) 

我更喜歡正確設置實體，使代碼更好，更易於使用。任何見解或知識，表示讚賞。

Answer 1

您的身份資料的所有配置都被定義爲IdentityDbContext<ApplicationUser>。所以，如果你創建從IdentityDbContext<ApplicationUser>派生您的自定義背景ApplicationDbContext你需要添加爲自己的實體結構如下圖所示之前調用此行base.OnModelCreating(modelBuilder);：

protected override void OnModelCreating(DbModelBuilder modelBuilder) 
{ 
    base.OnModelCreating(modelBuilder); 
    modelBuilder.Entity<ServiceCompany>().ToTable("ServiceCompanies"); 
}