I want to create a custom datatable and reference member id as a ForeignKey - But when I do like below I get an Null reference on ForeignKey-attribute (Umbraco.Core.Models.Member) .

I've "googled" and searched this forum but can't find any relevant answer.

Which type must I use in the attribute?

[TableName(DatabaseTables.Order)]
[PrimaryKey(nameof(OrderId), autoIncrement = true)]
[ExplicitColumns]
public class OrderTable
{   
    [Column(nameof(OrderId))]
    [PrimaryKeyColumn(AutoIncrement = true, Clustered = true, IdentitySeed = 1)]
    public int OrderId { get; set; }

    [Column(nameof(MemberId))]
    [ForeignKey(typeof(Member), Column = nameof(Member.Id))]
    public int MemberId { get; set; }

    [Column(nameof(CreatedDate))]
    public DateTime CreatedDate { get; set; }
}