How to join tables based on condition in codeigniter - php

Question

I want to write a query in such a way that,if received id matches with $id then request should join with profile table as
r.sent_id = profile_id
If sent_id matches with $id,then
r.sent_id = profile_id
My model,
public function getRequestedDetails($id) {
$this->db->select('*');
$this->db->from('profile');
$stat = $this->db->where('recieved_id', $id);
if($stat)
$this->db->join('requests enter code hereas r', 'r.sent_id = profile_id', 'left');
$stat = $this->db->where('sent_id', $id);
if($stat)
$this->db->join('requests as r', 'r.recieved_id = profile_id', 'left');
$this->db->where('r.status', 1);
$query = $this->db->get();
$list = $query->result();
return $list;
}
I tried this,it shows the following error
Error Number: 1066
Not unique table/alias: 'r'
SELECT * FROM `profile` LEFT JOIN `requests` as `r` ON `r`.`sent_id` = `profile_id` LEFT JOIN `requests` as `r` ON `r`.`recieved_id` = `profile_id` WHERE `recieved_id` = '5' AND `sent_id` = '5' AND `sent_id` = '5' AND `r`.`status` = 1
Can anyone help me.Thanks.

Answer 1

Try this..
public function getRequestedDetails($id) {
$query = $this->db->select('*')
->from('profile')
->join('requests','(requests.sent_id = ' . $id . ' AND requests.sent_id = profile.profile_id)
OR (requests.recieved_id = ' . $id . ' AND requests.recieved_id = profile.profile_id'), 'left')
->where('profile.status',1)
->get();
$list = $query->result();
return $list;
}

Answer 2

Try this
SELECT *
FROM profile
LEFT JOIN requests AS requests
ON (requests.sent_id = profile.profile_id OR requests.recieved_id = profile.profile_id)
WHERE profile.recieved_id = '5'
AND profile.sent_id = '5'
AND profile.sent_id = '5'
AND requests.status = 1