Hello I have the following code, 

```
$this->load->library('pagination');
$this->data['products'] = $this->products_model->get_products_and_category($this->uri->segment(4));

$config['base_url'] = base_url()."admin/products/manage/";
$config['total_rows'] = $this->db->get('products')->num_rows();
$config['per_page'] = 20;
$config['full_tag_open'] = '<div class="btn-group">';
$config['full_tag_close'] = '</div>';
$config['anchor_class'] = 'class="btn" ';
$config['cur_tag_open'] = '<div class="btn">';
$config['cur_tag_close'] = '</div>';
$config['uri_segment'] = 4;

$this->pagination->initialize($config); 
$this->data['pagination'] = $this->pagination->create_links();

$this->template->build('admin/products/index', $this->data);

```

The query this is being run by `get_products_and_category($this->uri->segment(4))` looks like this, 

```
public function get_products_and_category($offset=0) {
    $this->db->select('products.product_id, products.product_title, products.product_created, products.parent_category, categories.category_id, categories.category_title')
    ->from('products')
    ->join('categories' , 'products.parent_category = categories.category_id', 'left')
    ->order_by('products.product_title', 'ASC')
    ->limit(25, $offset);

    $query = $this->db->get();
    return $query->result_array();
}

```

There are 25 results in my table, and I want to show 20 per page, so by my maths the pagination class should create 2 links (page 1 and page 2) the first page should 20 results on it, and the second should have 4 results, however I am not getting any links at all, am I doing some wrong?