Generate a composite unique constraint/index with owned entity, in EF Core

Question

I have an entity that owns another entity

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


        

Answer 1

Apparently EF Core doesn't support this feature yet.

See this issue on GitHub: https://github.com/aspnet/EntityFrameworkCore/issues/11336

There is also a workaround offered, which I have not tested myself.