实体框架多租户共享数据架构:单列,多个外键

Question

我有以下数据结构:

//property Notification
abstract class BindableBase { }
//base class for all tenant-scoped objects
abstract class TenantModelBase : BindableBase 
{ 
  int TenantId;
} 

abstract class Order : TenantModelBase 
{
   Customer Customer; //works: mapped using TenantId and CustomerId
   Product Product; //again, works with TenantId and ProductId
   string ProductId;
   string CustomerId;
}
class Customer: TenantModelBase 
{
   string CustomerId; 
}

class Product  : TenantModelBase 
{
   string ProductId;
}

class SpecialOrder : Order
{
    OtherClass OtherClass; //this fails!, see below
    string OtherClassId;
}
class SuperSpecialOrder : SpecialOrder {  }

class OtherClass  : TenantModelBase 
{
    string OtherClassId;
}

我收到以下错误:

外键组件'TenantId'不是'SpecialOrder'类型的声明属性.验证它是否未从模型中明确排除,并且它是有效的原始属性.

使用Fluent Api配置时出错:

        config.HasRequired(p => p.OtherClass)
            .WithMany(oc => oc.SpecialOrders)
            .HasForeignKey(p => new {  p.TenantId, p.OtherClassId});

如果没有OtherClass在参考SpecialOrder我可以自由地创建对象没有问题(包括SpecialOrder,SuperSpecialOrder等).

有人知道发生了什么事吗？我在这里迷路了:(

编辑 我在人们从表中删除TenantId的其他问题中看到过,这不是一个选项,因为主键在租户中并不是唯一的,我们希望保留共享数据架构.

我知道解决方法是在SpecialOrder类中有第二个TenantId,但这对我来说似乎不合逻辑.

Answer 1

您是否正在尝试进行TPT,其中有一个单独的订单/租户表？如果是这样,我认为另一张海报是正确的,EF中有一个错误.

如果客户/产品是基于您的映射类,这可能对您有用.

我在创建数据库时发生了什么事情,它试图映射抽象的Order类.

通过增加:

modelBuilder.Ignore<Order>();

构建器由于MapInheritedProperties而保留了映射的属性,但未创建表以便正确创建所有FK.

我假设您希望为每个类创建单独的表,如上面的相关帖子,并且不映射您的抽象表.

整个型号:

 public abstract class BindableBase { }
   //base class for all tenant-scoped objects
   public abstract class TenantModelBase : BindableBase
   {
      [Key]
      public virtual int TenantId { get; set; }
   }

   public abstract class Order : TenantModelBase
   {
      public Customer Customer { get; set; } //works: mapped using TenantId and CustomerId
      public Product Product { get; set; } //again, works with TenantId and ProductId
      public string ProductId { get; set; }
      public string CustomerId { get; set; }
   }
   public class Customer : TenantModelBase
   {
      [Key]
      public string CustomerId { get; set; }
   }

   public class Product : TenantModelBase
   {
      [Key]
      public string ProductId { get; set; }
   }

   public class SpecialOrder : Order
   {
      [Key]
      public int SpecialOrderId { get; set; }
      public OtherClass OtherClass { get; set; } //this fails!, see below
      public string OtherClassId { get; set; }
   }
   public class SuperSpecialOrder : SpecialOrder { }

   public class OtherClass : TenantModelBase
   {
      public string OtherClassId { get; set; }
      public ICollection<SpecialOrder> SpecialOrders { get; set; }
   }



   public class Model : DbContext
   {
      public DbSet<Customer> Customers { get; set; }
      public DbSet<Product> Products { get; set; }
      public DbSet<SpecialOrder> SpecialOrders { get; set; }
      public DbSet<SuperSpecialOrder> SuperSpecialOrders { get; set; }

      public DbSet<OtherClass> OtherClasses { get; set; }

      protected override void OnModelCreating( DbModelBuilder modelBuilder )
      {
         modelBuilder.Entity<OtherClass>()
            .HasKey( k => new { k.TenantId, k.OtherClassId } );

         modelBuilder.Entity<Customer>()
            .HasKey( k => new { k.TenantId, k.CustomerId } );

         modelBuilder.Entity<Product>()
            .HasKey( k => new { k.TenantId, k.ProductId } );


         modelBuilder.Entity<SpecialOrder>()
            .Map( m =>
                     {
                        m.MapInheritedProperties();
                        m.ToTable( "SpecialOrders" );
                     } );

         modelBuilder.Entity<SpecialOrder>().HasKey( k => new { k.TenantId, k.SpecialOrderId } );

         modelBuilder.Entity<SuperSpecialOrder>()
          .Map( m =>
          {
             m.MapInheritedProperties();
             m.ToTable( "SuperSpecialOrders" );
          } )
          .HasKey( k => new { k.TenantId, k.SpecialOrderId } );

         modelBuilder.Entity<SpecialOrder>()
          .HasRequired( p => p.OtherClass )
          .WithMany( o => o.SpecialOrders )
          .HasForeignKey( p => new { p.TenantId, p.OtherClassId } );

         modelBuilder.Entity<Order>()
            .HasRequired( o => o.Customer )
            .WithMany()
            .HasForeignKey( k => new { k.TenantId, k.CustomerId } );

         modelBuilder.Entity<Order>()
          .HasRequired( o => o.Product )
          .WithMany()
          .HasForeignKey( k => new { k.TenantId, k.ProductId } );

         modelBuilder.Ignore<Order>();


      }
   }

创建数据库:

希望这可以帮助.