Updating user role using asp.net identity

Question

I have the following problem. While using the following code below to change the user\'s current role i am getting an exception with the message like below:

Answer 1

The problem is that your Manager and DB doesn't use the same DbContext. So when you send an user from the context of your DB to the Manager it will handle it as a "new" one - and then you cant remove it from the role. You have two ways to go here. The easiest is to get the User from your Manager.

[HttpPost]
[ValidateAntiForgeryToken]
public virtual ActionResult Edit(User user, string role)
{
    if (ModelState.IsValid)
    {
        // THIS LINE IS IMPORTANT
        var oldUser = Manager.FindById(user.Id);
        var oldRoleId = oldUser.Roles.SingleOrDefault().RoleId;
        var oldRoleName = DB.Roles.SingleOrDefault(r => r.Id == oldRoleId).Name;

        if (oldRoleName != role)
        {
            Manager.RemoveFromRole(user.Id, oldRoleName);
            Manager.AddToRole(user.Id, role);
        }
        DB.Entry(user).State = EntityState.Modified;

        return RedirectToAction(MVC.User.Index());
    }
    return View(user);
}

The more elegant way is to start using an DI-framework like AutoFac (https://code.google.com/p/autofac/wiki/MvcIntegration) and set your DbContext as InstancePerApiRequest.

builder.RegisterType().As().InstancePerApiRequest();