在创建团队时如何为该团队创建新日志？

Question

这是我的团队模型

    public partial class TeamModel
    {
        public TeamModel()
        {
            this.Players = new HashSet<PlayerModel>();

        }

        public int TeamModelId { get; set; }

        public string TeamName { get; set; }
        public int SchoolId { get; set; }
        public int DivisionId { get; set; }

        public LogModel TeamLog { get; set; }


        [ForeignKey("Under")]
        public int UnderId { get; set; }

        public virtual LogModel Log { get; set; }
        public virtual SchoolModel School { get; set; }
        public virtual DivisionModel Division { get; set; }
        public virtual UnderModel Under { get; set; }
        public virtual ICollection<PlayerModel> Players { get; set; }

这是我的日志模型

    public class LogModel
    {
        [Key]
        [ForeignKey("Team")]
        public int TeamId { get; set; }

        public int Played { get; set; }
        public int Win { get; set; }
        public int Draw { get; set; }
        public int Lost { get; set; }
        public int GoalsFor { get; set; }
        public int GoalsAgainst { get; set; }
        public int GoalDifference { get; set; }
        public int Points { get; set; }

        [ForeignKey("Season")]
        public int SeasonId { get; set; }

        public virtual SeasonModel Season { get; set; }
        public virtual TeamModel Team { get; set; }

    }

这是我在其中创建新团队的地方，也是在此过程中尝试为该特定团队创建新日志的地方。

 [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Include = "TeamModelId,TeamName,SchoolId,DivisionId,UnderId")] TeamModel teamModel)
        {
                teamModel.TeamLog = new LogModel();

                teamModel.TeamLog.Draw = 0;
                teamModel.TeamLog.GoalDifference = 0;
                teamModel.TeamLog.GoalsAgainst = 0;
                teamModel.TeamLog.GoalsFor = 0;
                teamModel.TeamLog.Lost = 0;
                teamModel.TeamLog.Played = 0;
                teamModel.TeamLog.Points = 0;
                teamModel.TeamLog.Win = 0;
                teamModel.TeamLog.SeasonId = db.Seasons.ToList().Last().SeasonId;

                db.Teams.Add(teamModel);
                db.SaveChanges();

                return RedirectToAction("Index");
            }

            ViewBag.DivisionId = new SelectList(db.Divisions, "DivisionId", "DivisionName", teamModel.DivisionId);
            ViewBag.SchoolId = new SelectList(db.Schools, "SchoolId", "SchoolName", teamModel.SchoolId);
            ViewBag.UnderId = new SelectList(db.Under, "UnderID", "UnderName", teamModel.UnderId);
            return View(teamModel);
        }

当我尝试向团队中添加新日志时遇到的错误是

System.Data.Entity.Infrastructure.DbUpdateException：'一个错误 保存不公开外键的实体时发生 关系的属性。 EntityEntries属性将 返回null，因为无法将单个实体标识为源 例外。可以在保存时处理异常 通过在实体类型中公开外键属性，可以更轻松地进行操作。看到 有关详细信息，请参见InnerException。

，内部异常是

UpdateException：无法确定依赖项的有效顺序 操作。由于外键约束，可能存在依赖关系， 模型要求或商店生成的值。

我在互联网上寻找解决方案，但找不到任何可行的方法。我认为我的问题是我如何寻找解决方案。我搜索了错误，但似乎解决方案无法解决我在这里遇到的问题。创建团队时，我花了几天时间尝试创建日志。