NHibernate - Eager在类型列的基础上加载一对多关系

Question

我需要急切地从同一个表加载三个一对多关系到其他三个表。以下是我的表的ERD：

ProcessActionLog 是与 ProcessActionEmail ， ProcessActionInterviewFeedback 和 ProcessActionNotesInfo 有三对一关系的表格基于 ProcessActionType 列的表格将包含以下列的名称：这些表格是我的映射：

1）ProcessActionLog表映射：

<%=variable%>

2）ProcessActionEmailMapping：

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();
        }

3） ProcessActionInterviewFeedback 映射：

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

4）ProcessActionNotesInfo

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

现在我尝试了以下查询，以便急切加载所有三种关系：

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

但是这给了我以下错误：

 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>();
        }

请帮助我解决此问题或建议我可以使用ProcessActionLog表的 processActionType 列急切加载实体的任何其他方法。谢谢。

Answer 1

最后，在映射中使用ISet而不是IList解决了这个问题，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 Mapping

 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();
        }
    }

查询与问题中的查询保持一致。