I've got some MVC code that serializes an EF 3.5 object into an anonymous type for return as a JSON result to an AJAX call on my page. The hurdle I have is that when I send the object back to the server via JSON, (and let the ModelBinder deserialize it for me into my EF type), I have to update it in my Entity Framework context manually. Or at least that's what I'm doing now. It has no EntityKey, so attaching it fails. I end up having to look up the old object and update it property by property. Any ideas around this? Is the solution to pass the EntityKey around with my object?

Here's what I have:

    public void Update(Album album)
    {
        using (var db = new BandSitesMasterEntities())
        {
            var albumToUpdate = db.Album.First(x => x.ID == album.ID);

            albumToUpdate.AlbumTitle = album.AlbumTitle;
            albumToUpdate.Description = album.Description;
            albumToUpdate.ReleaseYear = album.ReleaseYear;
            albumToUpdate.ImageURL = album.ImageURL;
            albumToUpdate.OtherURL = album.OtherURL;

            db.SaveChanges();
        }
    }

And here's what I'd like to do, or something similar:

    public void Update(Album album)
    {
        using (var db = new BandSitesMasterEntities())
        {
            db.Attach(album)
            db.SaveChanges();
        }
    }