删除父级/子级时出现问题

从会话中删除子记录时出现问题。以下是我定义的实体:

public class ReportedData
{
    public virtual int ReportedDataID { get; set; }
    public virtual ReportedDataTypes Type { get; set; }
    public virtual string Reason { get; set; }

    public virtual IList<ArticleCommentReported> ArticleCommentsReported { get; private set; }
    public virtual IList<ForumPostReported> ForumPostsReported { get; private set; }

    public ReportedData()
    {
        ArticleCommentsReported = new List<ArticleCommentReported>();
        ForumPostsReported = new List<ForumPostReported>();
    }
}

public class ArticleCommentReported : ReportedData
{
    public virtual ArticleComment Comment { get; set; }
}

public class ForumPostReported : ReportedData
{
    public virtual ForumPost Post { get; set; }
}

使用以下fluent映射:

public ReportedDataMap()
{
    Table("ReportedData");
    Id(x => x.ReportedDataID);
    Map(x => x.Type, "TypeID");
    Map(x => x.Reason);
    HasMany(x => x.ArticleCommentsReported)
        .KeyColumn("ReportedDataID")
        .Inverse()
        .Cascade.All();
    HasMany(x => x.ForumPostsReported)
        .KeyColumn("ReportedDataID")
        .Inverse()
        .Cascade.All();
}

public class ArticleCommentReportedMap : SubclassMap<ArticleCommentReported>
{
    public ArticleCommentReportedMap()
    {
        Table("ArticleCommentsReported");
        KeyColumn("ReportedDataID");
        References(x => x.Comment, "CommentID");
    }
}

public class ForumPostReportedMap : SubclassMap<ForumPostReported>
{
    public ForumPostReportedMap()
    {
        Table("ForumPostsReported");
        KeyColumn("ReportedDataID");
        References(x => x.Post, "PostID");
    }
}

// Loop over the reported data (this is my view model and not my actual model which contains an extra property for the action they wish to carry out)
foreach (var reportedData in model)
{
    // If the action is leave then do nothing (else we always delete the reported data)
    if (reportedData.Action != ReportedDataActions.Leave)
    {
        // Switch over the type since we need to make sure it deletes the article comment or post if the action is set to delete
        switch (reportedData.Type)
        {
            case ReportedDataTypes.ArticleComment:
                var reportedComment = _context.Repository<ArticleCommentReported>().GetByID(reportedData.ReportedDataID);

                if (reportedData.Action == ReportedDataActions.Delete)
                    _context.Repository<ArticleComment>().Delete(reportedComment.Comment);

                _context.Repository<ArticleCommentReported>().Delete(reportedComment);

                break;
            case ReportedDataTypes.ForumPost:
                var reportedPost = _context.Repository<ForumPostReported>().GetByID(reportedData.ReportedDataID);

                if (reportedData.Action == ReportedDataActions.Delete)
                    _forumService.DeletePost(reportedPost.Post);

                _context.Repository<ForumPostReported>().Delete(reportedPost);

                break;
        }
    }
}

_context.Commit();

当用户尝试删除论坛帖子时(针对报告数据的操作设置为delete),会抛出以下错误:

行被另一个事务更新或删除(或未保存的值映射不正确):[ForumPostReported#2]

我可能会设置一些映射,以便在报告的数据被删除后自动删除帖子/评论,但我只想在操作设置为删除时删除帖子/评论。

如果有人能帮忙我会很感激的。谢谢