Drupal 7 theme(''pager') -> table get's rendered but without Pager? - drupal-7

Question

I have a table with data from the database, I would like it to have a Pager, I have all the code from an example (of buildamodule.com) among other sites, and my table get's rendered, but it doesn't generate a pager, although I have more rows then the limit:
the function:
function get_loyaltycodes(){
$headers = array(
array(
'data' => t('Code')
),
array(
'data' => t('Info')
),
array(
'data' => t('Points')
),
array(
'data' => t('Consumed by')
),
);
$limit = variable_get('codes_per_page',5);
$query = db_select('loyalty_codes','lc');
$query -> fields('lc',array('code','info','points','uid'))
-> orderBy('lc.info','ASC')
-> extend('PagerDefault')
-> limit($limit);
//to see all codes for a certain amount of points, just append the number of points to the URL
$arg = arg(2);
if($arg != '' && is_numeric($arg))
{
$query->condition('points', $arg);
}
// Fetch the result set.
$result = $query->execute();
$rows = array();
// Loop through each item and add to the $rows array.
foreach ($result as $row) {
$rows[] = array(
$row->code,
$row->info,
$row->points,
$row->uid,
);
}
// Format output.
$output = theme('table', array('header' => $headers, 'rows' => $rows)) . theme('pager');
return $output;
the $limit variable is set to 5 in the settings form, and it is 5 in the database too.
Anybody who has any idea in why the pager is not showing? perhaps something in the formatting off the output?
Help is very much appreciated!

Answer 1

apparently I can't log in right know because I'm behind a firewall, anyway I seem to have fixed it, stupid mistake though:
the ‘->extend(‘PagerDefault’) extension in the query had to be the first function in the daisy chain. If not there is no error but the function seems to not be called.
$query = db_select('loyalty_codes','lc')
->extend('PagerDefault')
-> fields('lc',array('code','info','points','uid'))
-> orderBy('lc.info','ASC')
-> limit(5);//$limit);