我有三个相关的表。日历 1...* CalendarUser *...1 用户。当我在编辑日历视图中编辑了 CalendarUsers 后,我将 ViewModel 发布回控制器。这是我的控制器代码:
[HttpPost]
public ActionResult Edit(int id, CreateCalendarViewModel cvm)
{
long userId = long.Parse(User.Identity.Name);
db.Calendars.Attach(cvm.CurrentCalendar);
cvm.Users= DbExtensions.GetUserList(userId);
if (ModelState.IsValid)
{
////Remove the deselected users
cvm.CurrentCalendar.CalendarUsers.Clear();
//Get the names from the selected users
var selectedUsers = from u in cvm.Users
where cvm.SelectedUsers.Contains(u.Key)
select new KeyValuePair<long, string>(long.Parse(u.Key), u.Value);
foreach (var selectedUser in selectedUsers)
{
User user = db.Users.Find(selectedUser.Key);
//If usr does not exist create a new
if (user == null)
{
db.Users.Add(new User
{
UserId = selectedUser.Key,
Name = selectedUser.Value,
Expires = DateTime.Now,
AccessToken = string.Empty
});
}
//Add the binding to the calendar
cvm.CurrentCalendar.CalendarUsers.Add(new CalendarUser
{
CalendarId = cvm.CurrentCalendar.CalendarId,
UserId = selectedUser.Key
});
}
db.Entry(cvm.CurrentCalendar).State = EntityState.Modified;
db.SaveChanges();
}
return View(cvm);
}
这是我的课程:
public partial class Calendar
{
public Calendar()
{
this.CalendarUsers = new HashSet<CalendarUser>();
}
public int CalendarId { get; set; }
public string CalendarTitle { get; set; }
public string CalendarDescription { get; set; }
public long UserId { get; set; }
public virtual User User { get; set; }
public virtual ICollection<CalendarUser> CalendarUsers { get; set; }
}
public partial class CalendarUser
{
public int CalendarUserId { get; set; }
public int CalendarId { get; set; }
public long UserId { get; set; }
public Nullable<bool> IsAdmin { get; set; }
public virtual Calendar Calendar { get; set; }
public virtual User User { get; set; }
}
public partial class User
{
public User()
{
this.Calendars = new HashSet<Calendar>();
this.CalendarUsers = new HashSet<CalendarUser>();
}
public long UserId { get; set; }
public string Name { get; set; }
public virtual ICollection<Calendar> Calendars { get; set; }
public virtual ICollection<CalendarUser> CalendarUsers { get; set; }
}
出于某种原因,当我保存更改时,日历也被删除了?我搜索了一下,但似乎没有人有同样的问题?我做错了吗?有没有更好的方法来更新/删除相关实体?