eval-desempeno-v2/app/Models/UsuarioModel.php

<?php

namespace App\Models;

use CodeIgniter\Model;

class UsuarioModel extends Model
{
    protected $table            = 'usuarios';
    protected $primaryKey       = 'idusuario';
    protected $useAutoIncrement = true;
    protected $insertID         = 0;
    protected $returnType       = 'array';
    protected $useSoftDeletes   = false;
    protected $protectFields    = true;
    protected $allowedFields    = [];


    public function findByUsername($username)
    {
        return $this->where('nombreusuario', $username)->first();
    }
}