ServiceStack OrmLite - database first & multiple primary keys

Question

I have to work off an existing Db & would like to use ServiceStack's OrmLite.

Thus I have created Poco classes, using OrmLite T4 templates.

ISSUE: I would like to save to a table which has multiple primary keys.

 public partial class DbUserGroup
{
    [Required]
    public int Userid { get; set;} // this is a primary key
    [Required]
    public int Groupid { get; set;} // this is a primary key

    public int Ranking { get; set;}
    public bool Isprimary { get; set;}
}

Currently using Db.Save(userGroup) does not work. Is there any way of addressing this using ServiceStack's OrmLite.

Answer 1

I resolved it by adding [PrimaryKey] to both properties.

public partial class DbUserGroup
{
    [Required]
    [PrimaryKey]
    public int Userid { get; set;} // this is a primary key

    [Required]
    [PrimaryKey]
     public int Groupid { get; set;} // this is a primary key

    public int Ranking { get; set;}
    public bool Isprimary { get; set;}
}