asp.net core identity. insert logged in user ID to a table as FK - asp.net-core

Question

How can I insert current user into the Invite table ask FK?
Invite Model have been scaffolded
Models
{
public int ID { get; set; }
[ForeignKey("UserId")] //ICollection<Invite> in User
[Display(Name = "Users")]
public virtual ApplicationUser User { get; set; }
}
=================
public class ApplicationUser : IdentityUser
{
public string Description { get; set; }
[ForeignKey("GameID")]
public int? GameID { get; set; }
public Game Game { get; set; }
public string GameTag { get; set; }
public virtual ICollection<Invite> Invite { get; set; }

Answer 1

For your Invite model does not specify the ForeingnKey as a property,you just get the current user and add to the Invite instance:
public class InvitesController : Controller
{
private readonly ApplicationDbContext _context;
private readonly UserManager<ApplicationUser> _userManager;
public InvitesController(ApplicationDbContext context, UserManager<ApplicationUser> userManager)
{
_userManager = userManager;
_context = context;
}
[HttpPost]
public async Task<IActionResult> Create(Invite invite)
{
if (ModelState.IsValid)
{
invite.User = await _userManager.GetUserAsync(User); //add this...
_context.Add(invite);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
return View(invite);
}
}
Model:
public class Invite
{
public int ID { get; set; }
[ForeignKey("UserId")] //ICollection<Invite> in User
[Display(Name = "Users")]
public virtual ApplicationUser User { get; set; }
}
public class ApplicationUser : IdentityUser
{
public string Description { get; set; }
[ForeignKey("GameID")]
public int? GameID { get; set; }
public Game Game { get; set; }
public string GameTag { get; set; }
public virtual ICollection<Invite> Invite { get; set; }
}
public class Game
{
public int Id { get; set; }
public string Name { get; set; }
}