Question

我有一个拥有另一个实体的实体

public class Entity1
{
  [Key]
  [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
  public virtual int ID { get; set; }

  public string Property { get; set; }

  public Entity2 Description { get; set; }
}

public class Entity2
{
   public string Test { get; set; }
}

，我需要在Entity1.Property和Entity2.Test上创建索引。配置是这样的

builder.OwnsOne(pt => pt.Description);

builder.HasIndex(p => new { p.Property, p.Description.Test }).IsUnique();
//builder.HasIndex("Property", "Description_Test").IsUnique();

我尝试了以上两个代码，但是它们不起作用。第一个说

The properties expression 'p => new <>f__AnonymousType3`7(Property = p.DeviceClassId, 
Test = p.Description.Test)' is not valid. The expression should represent a property 
access: 't => t.MyProperty'. When specifying multiple properties use an anonymous type:
't => new { t.MyProperty1, t.MyProperty2 }'.
Parameter name: propertyAccessExpression

第二个说：

The property 'Description_test' cannot be added to the type 'Entity1' because there was no 
property type specified and there is no corresponding CLR property or field. To add a 
shadow state property the property type must be specified.

是否可以在不手动修改迁移的情况下实现？

Answer 1

显然EF Core还不支持此功能。

在GitHub上查看此问题： https://github.com/aspnet/EntityFrameworkCore/issues/11336

还提供了一种变通方法，我尚未进行自我测试。

在EF Core中使用拥有的实体生成复合的唯一约束/索引

1 个答案: