CodeIgniter UPDATE and LIMIT - codeigniter

Question

I know this question has been posted already before Update with limit 1 in codeigniter use active record
But it seems combining UPDATE and LIMIT using Active Record doesnt work on my side. It will still update all record based on the WHERE clause. I'm currently using CodeIgniter 3.0.6. Is this a bug from CodeIgniter already?
screenshot of the query

Answer 1

You cannot directly add limit in update query. I get an alternative way. Firstly you get one row by where query and then run the update query with using fetching row unique key like unique auto increment id.
$singleInfo = $this->db->get_where($tbl, array('user_id'=>1));
$this->db->update($tbl,array('username'=>'FredSmith'),array('user_id'=>$singleInfo->id));

Answer 2

Well I fired up CI 3.0.6 and used this as a demonstration, as we cannot see your setup.
public function db_update_test_with_limit(){
$tbl = 'users';
// Use Chaining - Works
$this->db
->where('user_id',1)
->limit(1)
->update($tbl,array('username'=>'FredSmith'));
echo $this->db->last_query();
// Use discrete calls - Works
$this->db->where('user_id',1);
$this->db->limit(1);
$this->db->update($tbl,array('username'=>'FredSmith'));
echo '<br>';
echo $this->db->last_query();
}
And the results for both are...
UPDATE `users` SET `username` = 'FredSmith' WHERE `user_id` = 1 LIMIT 1
UPDATE `users` SET `username` = 'FredSmith' WHERE `user_id` = 1 LIMIT 1
So if you are doing the same thing and getting different results, then something funky is going on.
If you use this as a test and massage it to suit your situation, does it work or not?