C#•9mo ago

Identity/EF collection returns null

Hey, so I'm new to using Entity Framework. I tried to extend the Identity User model with a one-to-many relationship, like so:

//Model/AppUser.cs
public class AppUser : IdentityUser
{
    public ICollection<Profile> Profiles { get; }
}

//Model/Profile.cs
public class Profile
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }
    public string AppUserId { get; set; }
    public AppUser AppUser { get; set; }
}

//Model/AppUser.cs
public class AppUser : IdentityUser
{
    public ICollection<Profile> Profiles { get; }
}

//Model/Profile.cs
public class Profile
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }
    public string AppUserId { get; set; }
    public AppUser AppUser { get; set; }
}

From here, I want to make a razor page that shows a logged in user's 'Profiles' as a list, but going about it the most obvious way gives me a null value. Is there a step I'm missing for getting collection data, or some other error?

//some razor page's cshtml
public async Task<IActionResult> OnGetAsync()
{
    StatusMessage = "";
    var user = await _userManager.GetUserAsync(User);
    if (user == null) {return NotFound($"User ID Not Found");}

    Username = user.UserName; //works as expected
    Profiles = user.Profiles; //null value
    return Page();
}

//some razor page's cshtml
public async Task<IActionResult> OnGetAsync()
{
    StatusMessage = "";
    var user = await _userManager.GetUserAsync(User);
    if (user == null) {return NotFound($"User ID Not Found");}

    Username = user.UserName; //works as expected
    Profiles = user.Profiles; //null value
    return Page();
}

2 Replies

Angius•9mo ago

It's not going to work with the manager. Not unless you make a custom one Related properties are not loaded by default You can just go through the dbcontext

if (User.FindFirstValue(ClaimTypes.NameIdentifier) is not {} uid) return Unauthorized();

var user = await _context.IdentityUsers
    .Where(u => u.Id == uid)
    .Select(u => new SomeUserDto {
        Name = u.UserName,
        Profiles = u.Profiles.Select(p => ...)
    })
    .FirstOrDefaultAsync();

if (user is null) return NotFound();

Username = user.Username;
Profiles = user.Profiles;

return Page();

if (User.FindFirstValue(ClaimTypes.NameIdentifier) is not {} uid) return Unauthorized();

var user = await _context.IdentityUsers
    .Where(u => u.Id == uid)
    .Select(u => new SomeUserDto {
        Name = u.UserName,
        Profiles = u.Profiles.Select(p => ...)
    })
    .FirstOrDefaultAsync();

if (user is null) return NotFound();

Username = user.Username;
Profiles = user.Profiles;

return Page();

Something like this

MawralOP•9mo ago

I see, thanks a whole bunch

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Identity/EF collection returns null