The entity type 'List<Guid>' requires a primary key to be defined

Question

The entity type 'List' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'.

I already define Id as the primary key here. but still, it's failing the Dotnet test case.

[Key]
public int Id { get; set; }

public List<Guid> Books { get; set; }

Answer 1

Creating a Book class would fix this. Then use List<Book> instead of List<Guid> .