Codeigniter Multiple Join Not Getting Sub Cat "Name" with Group_Concat - codeigniter

Question

On my list below I have all my categories displayed, but the sub categories do not display name. The sub category names should display like
Example
Example > Some Example 1
Example > Some Example 2
PHP
PHP > Functions
Question: On my model I should be able to retrieve the sub category name and the parent category name. But not working. Can only display parent name as shown in image I use group concat but it not show up in list group concat should display with > when sub cat name is there.
Why is it not working and what is the best solution?
As shown on image not display the > Some Example 1.
On my model I am using multiple join tables and I use for example .c1 and .cd1 get's parent categories and .cd2 .c2 gets sub categories.
But when I use my db->select with Group Concat it does not work and only gets the parent category name.
public function get_categories() {
$language_id = '1';
$this->db->select('cp.category_id AS category_id, GROUP_CONCAT(cd1.name SEPARATOR " > ") as name');
$this->db->from('category_path cp', 'LEFT');
// Parent Cat
$this->db->join('category c1', 'c1.category_id = cp.category_id', 'LEFT');
// Sub Cat
$this->db->join('category c2', 'c2.category_id = cp.path_id', 'LEFT');
// Parent Cat
$this->db->join('category_description cd1', 'cd1.category_id = cp.path_id', 'LEFT');
// Sub Cat
$this->db->join('category_description cd2', 'cd2.category_id = cp.category_id', 'LEFT');
$this->db->group_by('cp.category_id');
$this->db->order_by('name', 'ASC');
$this->db->where('cd1.language_id', (int)$language_id);
$this->db->where('cd2.language_id', (int)$language_id);
$query = $this->db->get();
return $query->result_array();
}
Tried with false below not worked same result
$this->db->select('cp.category_id AS category_id, GROUP_CONCAT(cd1.name SEPARATOR " > ") as name', false);
Var dump of results
array(5) { [0]=> array(2) { ["category_id"]=> string(2) "19" ["name"]=> string(7) "Example" } [1]=> array(2) { ["category_id"]=> string(2) "22" ["name"]=> string(7) "Example" } [2]=> array(2) { ["category_id"]=> string(2) "25" ["name"]=> string(7) "Example" } [3]=> array(2) { ["category_id"]=> string(2) "23" ["name"]=> string(3) "PHP" } [4]=> array(2) { ["category_id"]=> string(2) "24" ["name"]=> string(3) "PHP" } }
LAST QUERY
SELECT `cp`.`category_id` AS `category_id`, GROUP_CONCAT(cd1.name ORDER BY level SEPARATOR " > ") as name FROM `category_path` `cp` LEFT JOIN `category` `c1` ON `c1`.`category_id` = `cp`.`category_id` LEFT JOIN `category` `c2` ON `c2`.`category_id` = `cp`.`path_id` LEFT JOIN `category_description` `cd1` ON `cd1`.`category_id` = `cp`.`path_id` LEFT JOIN `category_description` `cd2` ON `cd2`.`category_id` = `cp`.`category_id` WHERE `cd1`.`language_id` = 1 AND `cd2`.`language_id` = 1 GROUP BY `cp`.`category_id` ORDER BY `name` ASC
Category Table
Category Desc Table
Category Path Table

Answer 1

Try this :
$this->db->select("cp.category_id AS category_id, GROUP_CONCAT(cd1.name ORDER BY cp.level SEPARATOR ' > ') AS name, c1.parent_id, c1.sort_order", FALSE);
$this->db->select() accepts an optional second parameter. If you set it to FALSE, CodeIgniter will not try to protect your field or table names with backticks. This is useful if you need a compound select statement.

Answer 2

Thanks to all who shared idea's to help.
I have found the cause of the issue is on my add category function.
When ever I create a category if it is a sub category in my category_path table
If sub category id is lets say 22 and parent id 19
Then on category_path table row should have two row should of inserted two rows like below.
category_id path_id level
22 19 0
22 22 1
For some reason on my model add category function it's not inserting the path id correct
Now I know what need to fix on model function.
Full Working Model
<?php
class Model_category extends CI_Model {
public function add() {
$data = array(
'parent_id' => (int)$this->input->post('parent_id'),
'status' => $this->input->post('status'),
'date_edited' => mdate('%Y-%m-%d %H:%i:%s', now()),
'date_added' => mdate('%Y-%m-%d %H:%i:%s', now())
);
$this->db->insert($this->db->dbprefix . 'category', $data);
$category_id = $this->db->insert_id();
$data = array(
'category_id' => (int)$category_id,
'language_id' => (int)'1',
'name' => $this->input->post('name'),
'meta_title' => $this->input->post('meta_title'),
'meta_description' => $this->input->post('meta_description'),
'meta_keyword' => $this->input->post('meta_keyword'),
'date_edited' => mdate('%Y-%m-%d %H:%i:%s', now()),
'date_added' => mdate('%Y-%m-%d %H:%i:%s', now())
);
$this->db->insert($this->db->dbprefix . 'category_description', $data);
// MySQL Hierarchical Data Closure Table Pattern
$level = 0;
$this->db->select('*');
$this->db->from($this->db->dbprefix . 'category_path');
$this->db->where('category_id', (int)$this->input->post('parent_id'));
$this->db->order_by('level', 'ASC');
$query = $this->db->get();
foreach ($query->result_array() as $result) {
$data = array(
'category_id' => (int)$category_id,
'path_id' => (int)$result['path_id'],
'level' => (int)$level,
);
$this->db->insert($this->db->dbprefix . 'category_path', $data);
$level++;
}
// The problem was here was not adding category into model but now
// All Fixed.
$data = array(
'category_id' => (int)$category_id,
'path_id' => (int)$category_id,
'level' => (int)$level
);
$this->db->insert($this->db->dbprefix . 'category_path', $data);
if (isset($data['keyword'])) {
$data = array(
'category_id' => 'category_id=' . (int)$category_id,
'keyword' => $this->input->post('keyword'),
'date_edited' => mdate('%Y-%m-%d %H:%i:%s', now()),
'date_added' => mdate('%Y-%m-%d %H:%i:%s', now())
);
$this->db->insert($this->db->dbprefix . 'url_alias', $data);
$this->db->query("INSERT INTO " . $this->db->dbprefix . "url_alias SET query = 'category_id=" . (int)$category_id . "', keyword = '" . $this->db->escape($data['keyword']) . "'");
}
}
public function edit() {
}
public function get_categories($data = array()) {
$language_id = '1';
$this->db->select('cp.category_id AS category_id, GROUP_CONCAT(cd1.name ORDER BY level SEPARATOR " > ") as name, c1.parent_id, c1.sort_order');
$this->db->distinct();
$this->db->from($this->db->dbprefix . 'category_path cp', 'LEFT');
$this->db->join($this->db->dbprefix . 'category c1', 'cp.category_id = c1.category_id', 'LEFT');
$this->db->join($this->db->dbprefix . 'category c2', 'cp.path_id = c2.category_id', 'LEFT');
$this->db->join($this->db->dbprefix . 'category_description cd1', 'cp.path_id = cd1.category_id', 'LEFT');
$this->db->join($this->db->dbprefix . 'category_description cd2', 'cp.category_id = cd2.category_id', 'LEFT');
$this->db->where('cd1.language_id', '1');
$this->db->where('cd2.language_id', '1');
$this->db->group_by('cp.category_id');
$this->db->order_by('name', 'ASC');
$query = $this->db->get();
if ($query->num_rows() > 0) {
return $query->result_array();
} else {
return FALSE;
}
}
}