PostgreSQL and Query Builder problem

PHP Code:

object(CodeIgniter\Database\Postgre\Result)#69 (8) { ["connID"]=> resource(13) of type (pgsql link) ["resultID"]=> resource(15) of type (pgsql result) ["resultArray"]=> array(0) { } ["resultObject"]=> array(0) { } ["customResultObject"]=> array(0) { } ["currentRow"]=> int(0) ["numRows"]=> NULL ["rowData"]=> NULL }

PHP Code:

namespace App\Controllers;
use App\Models\Usuarios_model;
use CodeIgniter\API\ResponseTrait;

class Usuarios extends BaseController{{
public function autenticar(){
        $model = new Usuarios_model();
        $userdata = array();
        //var_dump($this->request->isAJAX());
        //die();
        if($this->request->isAJAX()){
            $datos = json_decode(base64_decode($this->request->getPost('data')),TRUE);
            $query = $model->getUser($datos["user"], $datos["pass"]);
            var_dump($query);
            die();
            if(!isset($query)){
                foreach($query->getResult() as $row){
                    $userdata["usuario"] = $row->usernick;
                    $userdata["usuarioid"] = $row->id_user;
                    $userdata["logged"] = TRUE;
                }

                $this->session->set($userdata);
                return $this->respond(["message" => "bienvenido"],200);
            }
            else{
                return $this->respond(array('message' => 'Usuario o contraseña incorrectos'),404);
            }
        }
        else{
            return redirect()->to('/403');
        }
    }
}