Can't return a view with include()

ASP.net MVC3 Razor EF

When I开发者_如何学Python do this it works:

    public ViewResult Index()
    {
        return View(db.Songs.Include("Artist").ToList());
    }

But this doesn't:

    public ViewResult Index()
    {
        return View(db.Artists.Include("Song").ToList());
    }

I get this error:

A specified Include path is not valid. The EntityType 'MVCProject.Models.Artist' does not declare a navigation property with the name 'Song'.

Any idea why? if you need more info/code please mention which. but please let me know where something like that can happen, and how it can be solved. it's driving me crazy.

Thanks.

Artists Class:

public class Artist
{
    public int ArtistID{ get; set; }
    public string Name { get; set; }
    public IQueryable<Song> Songs{ get; set; }
}

Replace public IQueryable<Song> Songs{ get; set; } with public virtual ICollection<Song> Songs{ get; set; }

public class Artist
{
    public int ArtistID{ get; set; }
    public string Name { get; set; }
    public virtual ICollection<Song> Songs{ get; set; }
}

Then

return View(db.Artists.Include("Songs").ToList());

You probably have Songs (plural) as navigational property for Artist class. So, return View(db.Artists.Include("Songs").ToList()); should work. If ot - you need to show Model class for Artist