Joining tables with codeigniter active record - codeigniter

Question

I am trying to update my code from query to codeigniter active records.
This here is my old code
public function get_categories($parent_id = 0) {
$language_id = "1";
$query = $this->db->query("SELECT * FROM " . $this->db->dbprefix . "category c LEFT JOIN " . $this->db->dbprefix . "category_description cd ON (c.category_id = cd.category_id) LEFT JOIN " . $this->db->dbprefix . "category_to_store c2s ON (c.category_id = c2s.category_id) WHERE c.parent_id = '" . (int)$parent_id . "' AND cd.language_id = '" . (int)$language_id . "' AND c2s.store_id = '" . (int)$language_id . "' AND c.status = '1' ORDER BY c.sort_order, LCASE(cd.name)");
return $query->result_array();
}
And i am trying to update it to new code below
The problem I am having is it not getting the correct result by the id. And since upgrading to CI-3 old code does not work.
public function get_categories($parent_id = 0) {
$this->db->select('*');
$this->db->from('category');
$this->db->join('category_description', 'category_description.category_id = category.category_id', 'left');
$query = $this->db->get();
if ($query->num_rows() > 0) {
return $query->result_array();
} else {
return false;
}
}
How can I use the codeigniter join properly. to be able to get my code to work.

Answer 1

after upgrading to Codeigniter 3.0 you need to update your database config file:
delete: $active_record = TRUE;
add: $query_builder = TRUE;
there is actually more to consider updating, the full documentation you find here:
http://www.codeigniter.com/user_guide/changelog.html
and
http://www.codeigniter.com/user_guide/installation/upgrade_300.html