ApplicationDbContext ToListAsync() not returning 'Id' Column data

Question

Asp.NET MVC noob here

I have an AppUserRepository with a task:

public async Task<IEnumerable<AppUser>> GetAllForFirm(Tenant tenant)
        {
            return await _context.AppUsers.Where(u => u.Tenant == tenant && u.isDeleted == false).ToListAsync();
        }

I am then calling this task like so:

ViewModel:

public List<AppUser> UsersForFirm { get; set; }

Controller( AppUserController ):

string username = User.Identity.Name;
AppUser user = await _appUserRepository.GetByUsernameAsync(username);
AppuserViewModel avm = new AppuserViewModel();
avm.UsersForFirm = (List<AppUser>)await _appUserRepository.GetAllForFirm(user.Tenant);

(For extra context, each AppUser has a 'Tenant' object associated)

This almost works fine, and avm.UsersForFirm now holds an AppUser list where a given Tenant object is associated and I can extract all relevant info like UserNames, Email Addesses, lastLoggedIn dates etc. All good so far...

However, when I try to assign the avm.Id , it appears as though my GetAllForFirm task is returning a blank Guid (00000000-0000-0000-0000-000000000000) for each AppUser returned. If I check my database (in the AspNetUsers table, where all my AppUser info is stored), all AppUsers have a valid ('not' blank) Id and this is the only infomation that differs from the results of the GetAllForFirm() task.

Is anyone able to explain why this is, and what I'm doing wrong?

Thanks!

Answer 1

Try this and by pass the viewmModel

This is the controller

using Microsoft.AspNetCore.Identity;
using WorkshopPro.Areas.Identity.Data;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;

   public class UsersAdmin : Controller
        {
            private UserManager<ApplicationUser> userManager;
            private readonly YourContext _cs;
    
    
            public UsersAdmin(UserManager<ApplicationUser> usrMgr, YourContext cs)
            {
                userManager = usrMgr;
                this.roleManager = roleManager;
                _cs = cs;
            }
    
            public IActionResult Index()
            {
                return View(userManager.Users.Where(u => u.Tenant == tenant && u.isDeleted == false).ToList());
            }
    }

Then under your View

@model IEnumerable<YourProject.Areas.Identity.Data.AppUser>

<table>
 @foreach (var item in Model)
    {
<tr>
<td></td>
</tr>
    }
</table>

Answer 2

In my case it was because I had an Id field in my AppUser.cs Model.

Removing these lines

    public class AppUser : IdentityUser
    {
        [Key] //<----------- This one
        public string Id { get; set; }//<----------- And this one

Is what fixed it for me. After this, many other problems I was having were fixed too, such as User.IsInRole always returning false (and indeed anything else to do with user roles).

I spent 3 whole days trying to work this out, I hope this helps someone else.