c# - nhibernate，无法解析属性

Question

我对 NHibenate 有疑问。当我运行 queryover 时，我收到一个错误“无法解析属性：用户名：MegaOnlineChat.Core.Entities.Message”。我做错了什么？

实体对象

public class EntityObject<TId>
    {
        public virtual Int32 Id { get; set; }
    }
public class User:EntityObject<Int32>
    {
        public virtual String Name { get; set; }
        public virtual String Password { get; set; }
        public virtual Boolean Admin { get; set; }
        public virtual IList<Message> Messages { get; set; }
    }
public class Message:EntityObject<Int32>
    {
        public virtual String Text { get; set; }
        public virtual User User { get; set; }
        public virtual DateTime Date{ get; set; }
    }

映射

public class UserMapping:ClassMap<User>
{
    public UserMapping()
    {
        Table("Users");
        Id(m => m.Id).GeneratedBy.Native();
        Map(m => m.Name).Unique().Not.Nullable();
        Map(m => m.Admin).Not.Nullable();
        Map(m => m.Password).Not.Nullable();

        HasMany(m => m.Messages).KeyColumn("User_id");
    }
}
public class MessageMapping:ClassMap<Message>
{
    public MessageMapping()
    {
        Table("Messages");

        Id(m => m.Id).GeneratedBy.Native();

        Map(m => m.Text).Not.Nullable();
        Map(m => m.Date).Not.Nullable();

        References(m => m.User, "User_id").Not.Nullable();
    }
}

查询结束

NHibernateSession.QueryOver<Message>().Where(x => x.User.Name == name).List<Message>().Last();

Answer 1

QueryOver 与 Linq 查询提供程序不同。这样做会更容易：

NHibernateSession.Query<Message>().Where(x => x.User.Name == name).ToList();

但是如果你想使用 QueryOver，你需要明确地加入你想要导航的关系：

NHibernateSession.QueryOver<Message>()
    .JoinQueryOver(x => x.User) // navigate to the user on the relationship
    .Where(u => u.Name == name) // this restriction is on the User now
    .List();

您也可以使用用户的别名来执行此操作