sql-server - 如何从 ASP.NET Core 3.1 Identity 中的 IdentityUser 类添加关系？（代码优先）

Question

我有一个 Asp.Net Core MVC 3.1 项目。我想使用代码优先技术加入约会和患者表，但是外键列为空。

我的病人班；

public class Patient : IdentityUser
{
     [NotMapped]
     public List<Appointment> Appointments { get; set; }
}

而我的预约课，我与病人和预约有一对多的关系。

public class Appointment
{
    [Key]
    public int ID { get; set; }

    public string PatientID { get; set; }
    public Patient Patient { get; set; }
}

如果我向外键添加“必需”注释而不保存约会。

public Result<AppointmentVM> CreateAppointment(AppointmentVM model)
    {
        if (model != null)
        {
            try
            {
                var appointment = _mapper.Map<AppointmentVM, Appointment>(model);
                _unitOfWork.appointmentRepository.Add(appointment);
                _unitOfWork.Save();
                return new Result<AppointmentVM>(true, "Successful");
            }
            catch (Exception ex)
            {
                return new Result<AppointmentVM>(false, "Error" + ex.Message.ToString());
            }
        }
        else
            return new Result<AppointmentVM>(false, "Not null");
    }

我怎么解决这个问题？

public class AppointmentVM
{
    public int AppointmentID { get; set; }

    public string PatientID { get; set; }
    public PatientVM Patient { get; set; }
}


public class AppointmentRepository : Repository<Appointment>, IAppointmentRepository
{
    private readonly ClinicContext _ctx;

    public AppointmentRepository(ClinicContext ctx) : base(ctx)
    {
        _ctx = ctx;
    }
}