NHibernate-基于类型列的热切负载一对多关系

Question

我需要急于从同一个表中加载三个一对多关系到其他三个表。 以下是我桌的ERD：

ProcessActionLog是基于ProcessActionType列与ProcessActionEmail ， ProcessActionInterviewFeedback和ProcessActionNotesInfo表具有三个一对多关系的表，该表将包含该列的名称，以下是我对这些表的映射：

1）ProcessActionLog表映射：

class ProcessActionLogMap : ClassMap<ProcessActionLog>
    {
        public ProcessActionLogMap()
        {
            //Rest of mappings//
            HasMany(x => x.ProcessActionEmail).Cascade.SaveUpdate().Inverse();
            HasMany(x => x.ProcessActionInterviewFeedback).Cascade.SaveUpdate().Inverse();
            HasMany(x => x.ProcesssActionNotesInfo).Cascade.SaveUpdate().Inverse();
        }

2）ProcessActionEmailMapping：

class ProcessActionEmailMap : ClassMap<ProcessActionEmail>
    {
        public ProcessActionEmailMap()
        {
            //rest of mappings//
            References(x => x.ProcessActionLog, "ProcessActionLogId");
        }
    }

3） ProcessActionInterview反馈映射：

class ProcessActionInterviewFeedbackMap : ClassMap<ProcessActionInterviewFeedback>
    {
        public ProcessActionInterviewFeedbackMap()
        {
            //Rest of mappings//
            References(x => x.ProcessActionLog, "ProcessActionLogId");
        }
    }

4）ProcessActionNotesInfo

class ProcessActionNotesInfoMap : ClassMap<ProcessActionNotesInfo>
    {
        public ProcessActionNotesInfoMap()
        {
            //Rest of mappings//
            References(x => x.ProcessActionLog, "ProcessActionLogId");
        }
    }

现在，我尝试了以下查询，以渴望加载所有三个关系：

 public IList<ProcessActionLog> FetchUserSpecificProcessActionLogs(int UserId)
        {
            return _session.Query<ProcessActionLog>()
                            .Where(x => x.MasterUser.Id == UserId)
                            .Fetch(x => x.ProcessActionEmail)
                            .Fetch(x => x.ProcessActionInterviewFeedback)
                            .Fetch(x => x.ProcesssActionNotesInfo)
                            .ToFuture().ToList<ProcessActionLog>();
        }

但这给了我以下错误：

Cannot simultaneously fetch multiple bags. 

请帮助我解决此问题或提供建议的其他任何方法，让我可以使用ProcessActionLog Table的processActionType列来加载实体。 谢谢。

Answer 1

最后，通过在映射中使用ISet而不是IList解决了此问题，现在我的代码如下：

ProcessActionLog实体

    public class ProcessActionLog
    {
        /// <summary>
        /// Process Action Emails 
        /// </summary>
        private ISet<ProcessActionEmail> _ProcessActionEmail { get; set; }
        /// <summary>
        /// Process Action Interview Feedbacks
        /// </summary>
        private ISet<ProcessActionInterviewFeedback> _ProcessActionInterviewFeedback { get; set; }
        /// <summary>
        /// Process action notes info
        /// </summary>
        private ISet<ProcessActionNotesInfo> _ProcessActionNotesInfo { get; set; }
        /// <summary>
        /// Is process action email
        /// </summary>
        public virtual bool IsProcessActionEmail
        {
            get { return ProcessActionType == ProcessActionType.ProcessActionEmail; }
        }
        /// <summary>
        /// Is process action interview feedback
        /// </summary>
        public virtual bool IsProcessActionInterviewFeedback
        {
            get { return ProcessActionType == ProcessActionType.ProcessActionInterviewFeedback; }
        }
        /// <summary>
        /// Is process action notes info
        /// </summary>
        public virtual bool IsProcessActionNotesInfo
        {
            get { return ProcessActionType == ProcessActionType.ProcessActionNotesInfo; }
        }
        /// <summary>
        /// Process Action Log setter and getter
        /// </summary>
        public virtual ISet<ProcessActionEmail> ProcessActionEmail
        {
            get { return (IsProcessActionEmail ? _ProcessActionEmail : null); }
            set { _ProcessActionEmail = value; }
        }
        /// <summary>
        /// Process Action Interview Feedback setter and getter
        /// </summary>
        public virtual ISet<ProcessActionInterviewFeedback> ProcessActionInterviewFeedback
        {
            get { return (IsProcessActionInterviewFeedback ? _ProcessActionInterviewFeedback : null); }
            set { _ProcessActionInterviewFeedback = value; }
        }
        /// <summary>
        /// Process Action Notes info setter and getter
        /// </summary>
        public virtual ISet<ProcessActionNotesInfo> ProcessActionNotesInfo
        {
            get { return (IsProcessActionNotesInfo ? _ProcessActionNotesInfo : null); }
            set { _ProcessActionNotesInfo = value; }
        }
    }

ProcessActionEmail实体

public class ProcessActionEmail
{
    //Rest of the attributes

    /// <summary>
    /// Process Action log of this particular email
    /// </summary>
    public virtual ProcessActionLog ProcessActionLog { get; set; }

ProcessActionInterviewFeedback实体

public class ProcessActionInterviewFeedback 
{
    /// <summary>
    /// Process Action Log
    /// </summary>
    public virtual ProcessActionLog ProcessActionLog { get; set; }
}

ProcessActionLog映射

 class ProcessActionLogMap : ClassMap<ProcessActionLog>
    {
        public ProcessActionLogMap()
        {
            Id(x => x.Id);
            Map(x => x.LogName).Length(100).Not.Nullable();
            Map(x => x.ProcessActionType).CustomType<Int32>().Not.Nullable();
            Map(x => x.CreatedAt).CustomType<DateTime>().Not.Nullable();
            References(x => x.MasterUser).Column("UserId");
            References(x => x.Process).Column("ProcessId");
            References(x => x.SystemUser).Column("CreatedBy");
            References(x => x.Task).Column("TaskId").Nullable();
            HasMany(x => x.ProcessActionEmail).Cascade.SaveUpdate().Inverse();
            HasMany(x => x.ProcessActionInterviewFeedback).Cascade.SaveUpdate().Inverse();
            HasMany(x => x.ProcessActionNotesInfo).Cascade.SaveUpdate().Inverse();
        }
    }

并且查询与问题中的查询相同。