c# – 流利的NHibernate“无法解析属性”

我已经阅读了很多关于相同错误的问题,但是没有一个是为了匹配我的确切问题.我正在使用Fluent NHibernate访问对象的属性,本身是根对象的一部分.有些答案说我需要使用预测,其他的我需要使用加入,我认为它应该通过懒惰加载工作.

这是我的两个课程以及流畅的映射：

艺术家类

public class Artist
{
    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual IList<Album> Albums { get; set; }
    public virtual string musicbrainzId { get; set; }
    public virtual string TheAudioDbId { get; set; }

    public Artist() { }
}

public class ArtistMap : ClassMap<Artist>
{
    public ArtistMap()
    {
        LazyLoad();
        Id(a => a.Id);
        Map(a => a.Name).Index("Name");
        HasMany(a => a.Albums)
            .Cascade.All();
        Map(a => a.musicbrainzId);
        Map(a => a.TheAudioDbId);
    }
}

专辑类

public class Album
{
    public virtual int Id { get; set; }
    public virtual Artist Artist { get; set; }
    public virtual string Name { get; set; }
    public virtual IList<Track> Tracks { get; set; }
    public virtual DateTime ReleaseDate { get; set; }
    public virtual string TheAudioDbId { get; set; }
    public virtual string musicbrainzId { get; set; }

    public Album() { }
}

public class AlbumMap : ClassMap<Album>
{
    public AlbumMap()
    {
        LazyLoad();
        Id(a => a.Id);
        References(a => a.Artist)
            .Cascade.All();
        Map(a => a.Name).Index("Name");
        HasMany(a => a.Tracks)
            .Cascade.All();
        Map(a => a.ReleaseDate);
        Map(a => a.TheAudioDbId);
        Map(a => a.musicbrainzId);
    }
}

当这个代码被解释时,会发生错误：

var riAlbum = session.QueryOver<Album>()
                .Where(x => x.Name == albumName && x.Artist.Name == artist)
                .List().FirstOrDefault();

当Fluent NHibernate尝试解析x.Artist.Name值时,会发生错误：

{“Could not resolve property: Artist.Name of: Album”}

这样做的正确方法是什么？

select
    Album.*
from
    Album
where
    Album.Name = 'SomeAlbumName' and
    Album.Artist.Name = 'SomeArtistName'

var riAlbum = 
    session.QueryOver<Album>()
               .Where(al => al.Name == albumName)
           .JoinQueryOver(al => al.Artist)
               .Where(ar => ar.Name == artistName)
           .List()
           .FirstOrDefault();

var riAlbum = 
    session.QueryOver<Album>()
               .Where(al => al.Name == albumName)
           .JoinQueryOver(al => al.Artist)
               .Where(ar => ar.Name == artistName)
           .Take(1)
           .SingleOrDefault<Album>();