CI_SESSION unknown table in 'order clause' - codeigniter

Question

I use database table to store the ci_session. Here is my controller:
public function displayAllArticles()
{
// custom limit, set in zconfig for all tables
$customLimit = $this->config->item('articles_per_page');
// get the total number or records
$totalARTresults = $this->db->get('article')->num_rows();
// set the paging variables
if ($this->uri->segment(4) !="")
{
$limit = $this->uri->segment(4);
} else {
$limit = $customLimit;
}
$offset = 5;
$offset = $this->uri->segment(5);
$this->db->limit($limit, $offset);
// line bellow is the offending line <<<<<<<<<<<<<<<<<<<<<<<<
$this->db->order_by('articlecategoryID desc, articleSorder asc');
$data['articles'] = $this->articlesModel->get_with_category();
// session variables bellow are used in the view, for the
// code that display the message: Displaying x to y from total of z records
$this->session->set_userdata('totalARTresults', $totalARTresults);
$this->session->set_userdata('limit', $limit);
$this->session->set_userdata('offset', $offset);
$data['articles'] = array_splice($data['articles'], $offset, $limit);
// paging configuration
$this->load->library('pagination');
$config['base_url'] = site_url('/backEnd/articles/displayAllArticles/'.$limit.'/');
$config['total_rows'] = $totalARTresults;
$config['per_page'] = $limit;
$config['uri_segment'] = 5;
$config['full_tag_open'] = '<div class="dataTables_paginate paging_bootstrap pagination"><ul>';
$config['full_tag_close'] = '</ul></div>';
$config['cur_tag_open'] = '<li><a href=# style="color:#ffffff; background-color:#258BB5;">';
$config['cur_tag_close'] = '</a></li>';
$config['num_tag_open'] = '<li>';
$config['num_tag_close'] = '</li>';
// initialize the paging
$this->pagination->initialize($config);
// create & load the variables needed for the view
$errorMessage = '';
$data['main_content'] = 'articles/articles';
$data['title'] = 'Articles';
$this->load->vars($data,$errorMessage);
$this->load->vars($this->currentUser);
$this->load->view('backOffice/template');
} // end of function displayAllArticles
When i call this function, i get the error message:
Error Number: 1054
Unknown column 'article.articlecategoryID' in 'order clause'
UPDATE ci_sessions SET last_activity = 1398256604, `...........
I have searched this site, and I found this:
CI_session and Error Number: 1054 (Unknown column ...)
but the solution: $this->db->_reset_write();
doesn't work.
Author there says that:
$this->session->userdata();
$this->session->set_userdata();
etc...
MUST BE used before/after execute your own CRUD ($this->db->...), but where ever i move the code for the session, i get same error.
Anyone can give me a hand with this? I know that I can just remove the order_by clausule in my controller, but I have plenty of legacy code that will have to be changed if I do so.
Any help will be deeply appreciated.
Regards, John

Answer 1

Make sure following things -
1) Order of auto-loading libraries (config/autoload.php)
$autoload['libraries'] = array('database','upload','session','form_validation');
// session loaded after database library
2) Having a ci_sessions table
CREATE TABLE IF NOT EXISTS `ci_sessions` (
session_id varchar(40) DEFAULT '0' NOT NULL,
ip_address varchar(45) DEFAULT '0' NOT NULL,
user_agent varchar(120) NOT NULL,
last_activity int(10) unsigned DEFAULT 0 NOT NULL,
user_data text NOT NULL,
PRIMARY KEY (session_id),
KEY `last_activity_idx` (`last_activity`)
);
//Refer: http://ellislab.com/codeigniter/user-guide/libraries/sessions.html
// ensure table name: ci_sessions
3) Enable use of ci_sessions table in config/config.php
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 0;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie'] = FALSE;
$config['sess_use_database'] = TRUE;
$config['sess_table_name'] = 'ci_sessions'; // ensure table name: ci_sessions
$config['sess_match_ip'] = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 86400 * 30; //30 days