Codeigniter with datamapper save error - php

Question

So I was trying to make a CRUD for my app. I have setup a controller, like this:
class Clients extends CI_Controller {
public function __construct() {
parent::__construct();
session_start();
$this->c = new Client();
$this->u = new User();
}
function index() {
$data['current_view'] = 'client_view';
$data['header'] = 'Меню клиентов';
$data['clients'] = $this->getClients();
$this->load->view('main_view',$data);
}
function getClients() {
$this->u->where('username',$_SESSION['username'])->get();
$c = $this->c->where('user_id',$this->u->id)->get();
return $c;
}
function delClient() {
$this->c->where('client_id', $this->uri->segment(3))->delete();
$this->c->skip_validation()->save();
$this->index();
}
}
However, when I'm trying to perform a delete on a client, i get a db error:
You must use the "set" method to update an entry.
Filename: C:\OpenServer\domains\localhost\system\database\DB_active_rec.php
Line Number: 1174
What might be the cause of this? I found a similar question here, but I don't think that's the case.
EDIT: Client model:
class Client extends DataMapper {
public $has_one = array('user');
public function __construct($id = NULL) {
parent::__construct($id);
}
}

Answer 1

you have not passed the uri segment to the function delClient() and this is your model right...
function delClient($id) {
//$id is the value which you want to delete
$this->c->where('client_id', $id)->delete();
$this->c->skip_validation()->save();
$this->index();
}