I have a question model that references the AppUser model. This ratio is from 1 to * because 1 AppUser has many Questions, and the question belongs to 1 AppUser. My Question class is as follows:
public class Question
{
public int Id { get; set; }
public string Subject { get; set; }
public string Text { get; set; }
public DateTime Date { get; set; }
public int NumOfViews { get; set; }
public AppUser LastAnswerBy { get; set; }
public AppUser AppUser { get; set; }
public ICollection<Comment> Comments { get; set; }
}
So, I am trying to add a new question to the database in my controller as follows:
[HttpPost]
public ActionResult PostQuestion(Question question)
{
if (ModelState.IsValid)
{
var id = User.Identity.GetUserId();
var user = UserManager.Users.FirstOrDefault(x => x.Id == id);
question.Date = DateTime.Now;
question.AppUser = user;
_context.Questions.Add(question);
_context.SaveChanges();
return RedirectToAction("Index");
}
return View(question);
}
private AppUserManager UserManager
{
get { return HttpContext.GetOwinContext().GetUserManager<AppUserManager>(); }
}
With this code, I get an exception: An entity object cannot reference multiple instances of IEntityChangeTracker. So after searching a bit, the problem seems to be that my controller and the AppUserManager class have 2 different instances of my DbContext, and the solution is to inject it into these classes. Embedding it in my controller is not a problem, but I don’t know how to insert it into my UserManager class, which looks like this:
public class AppUserManager : UserManager<AppUser>
{
public AppUserManager(IUserStore<AppUser> store)
: base(store)
{ }
public static AppUserManager Create(IdentityFactoryOptions<AppUserManager> options,
IOwinContext context)
{
AppIdentityDbContext db = context.Get<AppIdentityDbContext>();
AppUserManager manager = new AppUserManager(new UserStore<AppUser>(db));
return manager;
}
}
IdentityConfig, :
public class IdentityConfig
{
public void Configuration(IAppBuilder app)
{
app.CreatePerOwinContext<AppIdentityDbContext>(AppIdentityDbContext.Create);
app.CreatePerOwinContext<AppUserManager>(AppUserManager.Create);
app.CreatePerOwinContext<AppRoleManager>(AppRoleManager.Create);
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
LoginPath = new PathString("/Account/Login"),
});
app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);
}
, , , .
:
, . :
private AppIdentityDbContext Context
{
get { return HttpContext.GetOwinContext().Get<AppIdentityDbContext>(); }
}