Code igniter - running two queries collide - php

Question

As part of a very large active records query in CI, I need to get something from a different model - something like:
$sql = $this->events_model->events_to_sql($val); //returns an sql
$this->db->where($sql, NULL, false);
Now "events_to_sql" run a different query to get some data it needs for it to operate, but it fails because it uses an Active Records "where" from before, where the first query is not closed.
$this->db->where("clients.email !=", '');
How can I tell CI: This is a separate query. You shall run it and only it?
*No, I can not run the other query first, because there are multiple of the same idea, and I don't want each case t be handled separately, but all to be handled in the same manner.
*I know I can use another DB connection, but I'd rather work with a single connection.
EDIT:
This is what runs: (in order)
//main model
$this->db->where("clients.email !=", '');
//Events to sql function
//run seperate function
$this->db->from('events');
return $this->db->get();
return (string)$sql_built_from_the_event_stuff.
Instead of getting: "SELECT * FROM events" I get "SELECT * FROM events WHERE clients.email != ''"

Answer 1

Use arguments to separate query,
Example:
$separate = 1;
$sql = $this->events_model->events_to_sql($val,$separate); //returns an sql
$this->db->where($sql, NULL, false);
Model events_to_sql,
public function events_to_sql($val, $queryselector = false){
.....
.....
if($queryselector != 1){
$this->db->where("clients.email !=", '');
}
//Events to sql function
//run seperate function
$this->db->from('events');
return $this->db->get();
return (string)$sql_built_from_the_event_stuff.
}