unset value from object

[eluser]Jeroen Brussich[/eluser]
I found a imho dirty solution, but I still would like somebody to have a look, point his finger and laugh at me and then provide me with the right code. :p

Code:

public function remove_doubles($candidates, $loaners)
    {
// build an array with the user_ids
        $haystack = array();
        foreach($loaners->result() as $loaner)
        {
            $haystack[]    = $loaner->id;
        }

//look if the user_id from the candidate is in the already_loaned_haystack
//iterate i
        $i = 0;
        foreach($candidates->result() as $candidate)
        {
            $needle    = $candidate->id;
            if(in_array($needle, $haystack))
            {
// DIRTY!!!
// hack into the object and force unset.
// manually reset num_rows
// do not user ->num_rows() after this, because it would return the number of rows of the initial object, not the hacked object.
                unset($candidates->result_object[0]);
                $candidates->num_rows = $candidates->num_rows -1;
            }
            $i++;
        }


// return hacked object or FALSE
        if($candidates->num_rows != 0) // do not use ->num_rows() but ->num_rows
        {
            sort($candidates->result_object);
            return $candidates;
        }
        return FALSE;
    }