Codeigniter: Join not working with columns same name and id - php

Question

I wanting to be able to join two tables togeather.
How ever because I my forum table has column "name" and my forum_categories column "name"
I am not able to display both names.
On my select() if I use like $this->db->select('f.name, fc.name', false); it only displays name from forum_categories
array(1) { [0]=> array(1) { ["name"]=> string(17) "News & Discussion" } }
Question how can I get both names to show from both columns and
tables.
Note: I only want to be able to use $result['name'] in my foreach loop.
So the out put I would like it to be
General
News & Discussion
Lounge
I have looked at
CodeIgniter ActiveRecord field names in JOIN statement
codeigniter - select from 2 tables with same column name
Model
public function get_forums() {
$this->db->select('f.name, fc.name', false);
$this->db->from('forum as f');
// tried $this->db->join('forum_categories as fc', 'fc.forum_id = f.forum_id');
$this->db->join('forum_categories as fc', 'fc.forum_categories_id = f.forum_id');
$query = $this->db->get();
if ($query->num_rows() > 0) {
return $query->result_array();
} else {
return false;
}
}
Controller
<?php
class Forums extends MY_Controller {
public function __construct() {
parent::__construct();
}
public function index() {
$data['label'] = '';
$data['forums'] = array();
$results = $this->get_forums();
var_dump($results);
if (isset($results)) {
foreach ($results as $result) {
$data['forums'][] = array(
'name' => $result['name'], // Only want to use single variable.
);
}
}
$data['header'] = Modules::run('admin/common/header/index');
$data['footer'] = Modules::run('admin/common/footer/index');
$this->load->view('template/forum/list_forum_view', $data);
}
public function get_forums() {
$this->db->select('f.name, fc.name', false);
$this->db->from('forum as f');
$this->db->join('forum_categories as fc', 'fc.forum_categories_id = f.forum_id');
$query = $this->db->get();
if ($query->num_rows() > 0) {
return $query->result_array();
} else {
return false;
}
}
}
update
works fine with code below but would rather just use one lot of join()
public function get_forums() {
$this->db->select("*");
$this->db->from('forum');
$query = $this->db->get();
foreach ($query->result_array() as $f) {
$data[] = array(
'name' => $f['name']
);
$this->db->select("*");
$this->db->from('forum_categories');
$query = $this->db->get();
foreach ($query->result_array() as $fc) {
$data[] = array(
'name' => $fc['name']
);
}
}
return $data;
}

Answer 1

Try This , It Will Work .
public function get_forums() {
$this->db->select('f.name as forum_name, fc.name as forum_categories_name', false);
$this->db->from('forum f');
// tried $this->db->join('forum_categories fc', 'fc.forum_id = f.forum_id');
$this->db->join('forum_categories fc', 'fc.forum_categories_id = f.forum_id');
$query = $this->db->get();
if ($query->num_rows() > 0) {
return $query->result_array();
} else {
return false;
}
}

Answer 2

From what i see in your updated question. What you need is UNION and not JOIN. You can use get_compiled_select() to build both query before concat with UNION.
public function get_forums() {
$forum = $this->db->select('name')->get_compiled_select('forum');
$forum_categories = $this->db->select('name')->get_compiled_select('forum_categories');
$query = $this->db->query($forum.' UNION '.$forum_categories);
if ($query->num_rows() > 0) {
return $query->result_array();
} else {
return false;
}
}

Answer 3

Simply use
AS
keyword, because when you try to print it, that AS keyword give you optional name for your column.
Here i have two table which have same column name "name" so i have changed those with AS keyword.
Ex:
$this->db->select('tbl_category.id_category,tbl_category.name AS cat_name,
tbl_subject.id_subject,tbl_subject.name AS sub_name');
In result
Array ( [0] => Array ( [id_category] => 9 [cat_name] => OL [id_subject] => 13 [sub_name] => Science )
So it is simple solution from the SQL language