how to annotate a parent-child relationship with Code-First

Question

When using the CTP 5 of Entity Framework code-first library (as announced here) I\'m trying to create a class that maps to a very simple hierarchy table.

Here\'s the SQL

Answer 1

In Entity Framework 6 you can do it like this, note public Guid? ParentId { get; set; }. The foreign key MUST be nullable for it to work.

class Person
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public Guid? ParentId { get; set; }
    public virtual Person Parent { get; set; }
    public virtual ICollection Children { get; set; }
}

https://stackoverflow.com/a/5668835/3850405