why it's generating query without "from tablename" in codeigntier - php

Question

Here is my code.
public function get_records($event_id = null)
{
$this->db->select('a.*');
$this->db->from('attendee a');
$this->db->join('event e','e.event_id = a.attendee_event_id','left');
$this->db->join('users u','u.id = e.event_user_id','left');
if($event_id != null)
$this->db->where('a.attendee_event_id',$event_id);
if($this->ion_auth->is_agent())
{
$this->db->where('e.event_user_id', csession('user_id'));
}
else
{
$this->db->group_start();
$this->db->where('e.event_user_id', csession('user_id'));
$this->db->or_where('u.created_by', csession('user_id'));
$this->db->group_end();
}
$query = $this->db->get();
return $query->result();
}
for this code i am getting below result
Error Number: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE ( `e`.`event_user_id` = '93' OR `u`.`created_by` = '93' ) AND `a`.`atte' at line 2
SELECT * WHERE ( `e`.`event_user_id` = '93' OR `u`.`created_by` = '93' ) AND `a`.`attendee_event_id` = '2'
Filename: models/Attendee_model.php
Line Number: 85
Whenever i am passing event_id, it's not working fine.
but when I am not passing event_id, it's working fine.
I don't know what i am doing wrong here.

Answer 1

CI is throwing that error because you are not providing the table name in the "get()" method.
Your code
$query = $this->db->get();
Correct approach
$query = $this->db->get('main_table_name');
For a better understanding of CI Query Builder read here

Answer 2

$this->db->group_start();
$this->db->where('e.event_user_id', csession('user_id'));
$this->db->or_where('u.created_by', csession('user_id'));
$this->db->group_end();
I have removed above code and it started working. btw it was unnecessary code. But I coudn't find the issue with this code though.