Error in codeigniter call to undefined method with my model - php

Question

I am new in codeigniter, I've read how to load some models with this framework. Now i have a problem regarding with using my model. I have an error of Message: Call to undefined method User_model::select().
My situation is simple, I want to implement a data table and i am using my model by it. Here is what my error comes:
//total records
foreach ($this->user->select("COUNT(*) AS count", $where, $join) as $key => $value) {
$data["iTotalDisplayRecords"] = $value->count;
$data["iTotalRecords"] = $value->count;
}
as you can see, i was using $this->user which is refers to my model i loaded in my constructor:
public function __construct() {
parent::__construct();
if (!$this->ion_auth->logged_in()){
redirect('auth/login', 'refresh');//redirect them to the login page
}
if (!$this->ion_auth->is_admin()){
redirect(base_url().'login', 'refresh');
}else{
$this->admin_id = $this->session->userdata('user_id');
$this->load->library("pagination");
$this->load->model('user_model','user');
}
}
Here is the code of my model:
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class User_model extends CI_Model {
public function __construct() {
if ($this->ion_auth->logged_in()){
$this->user_id = $this->session->userdata('user_id');
$group = $this->ion_auth->get_users_groups($this->user_id)->result();
$this->group_id = $group[0]->id;
}
}
public $tbl_name = "users";
}

Answer 1

No this is not the way to call select in CI3. You have to write your own method in the model class then call that method.
I have rewrite your model, try this:
<?php
defined('BASEPATH') or exit('No direct script access allowed');
class User_model extends CI_Model
{
private $tbl_name = "users";
public function __construct()
{
if ($this->ion_auth->logged_in()) {
$this->user_id = $this->session->userdata('user_id');
$group = $this->ion_auth->get_users_groups($this->user_id)->result();
$this->group_id = $group[0]->id;
}
}
public function select($select, $where, $join)
{
$this->db->select($select);
$this->db->from($this->$tbl_name);
$this->db->where($where);
$this->db->join($join);
return $this->db->get()->result();
}
}