The following constructors had parameters that could not be bound to properties of the entity type: - asp.net

Question

Im trying to create a constructor for the trail model. I need the constructor because Im modyfing the controller, this is the actual implementation of the controller (I don't think the problem is there):
public async Task<ActionResult<Trail>> PostTrail(
string Name, int CreatorId, Difficulty difficulty, string Description)
{
if (_context.Trails == null)
{
return Problem("Entity set 'LivetrailsDBContext.Trails' is null.");
}
if (_context.Trails.Any(trail => trail.Name == Name))
{
return Problem($"Trail with name {Name} already exists ");
}
var creator = _context.Users.Find(CreatorId);
if (creator == null)
{
Problem($"There is no creator with such Id ({CreatorId})");
}
Trail trail = new Trail(Name, creator, difficulty, Description);
_context.Trails.Add(trail);
await _context.SaveChangesAsync();
return CreatedAtAction("GetTrail", new { id = trail.Id }, trail);
}
So, I created the suitable constructor, but when I run add-migration it returns this error:
No suitable constructor was found for entity type 'Trail'. The following constructors had parameters that could not be bound to properties of the entity type: cannot bind 'creator' in 'Trail(string name, User creator, Difficulty difficulty, string description)'.
Here is the Trail class with the constructor:
namespace LivetrailsBackend.Models.DataModels
{
public class Trail: BaseEntity
{
[Required, StringLength(50)]
public string Name { get; set; }
[Required]
public User Creator { get; set; }
[Required]
public int CreatorId { get; set; }
[Required]
public Difficulty Difficulty { get; set; }
public string Description { get; set; }
public Trail(string name, User creator, Difficulty difficulty, string description)
{
Name = name;
Creator = creator;
CreatorId = creator.;
Difficulty = difficulty;
Description = description;
}
}
}
Here is the User model:
namespace LivetrailsBackend.Models.DataModels
{
public class User: BaseEntity
{
[Required, StringLength(20)]
public string UserName { get; set; }
[Required, EmailAddress]
public string Email { get; set; }
[Required]
public string Password { get; set; }
public ICollection<Trail> Trails { get; set; } = new List<Trail>();
}
}

Answer 1

you have a bug in your code. when creator == null the code should return error
if (creator == null)
{
Problem($"There is no creator with such Id ({CreatorId})");
return .... your error code
}
and IMHO instead of creator it is much better to use just a creatorId, you don't need to assign both, fix your constructor too
[Required]
public int CreatorId { get; set; }
public User Creator { get; set; }