在codeigniter模型中为foreach（）提供的参数无效

function mostViewedTracks() {
    $this->load->database();        
    $this->db->select("*");
    $this->db->from("file");
    $this->db->order_by("views", "desc");
    $this->db->limit(8);
    $query = $this->db->get();
    if($query->num_rows() > 0)
    {
        $results = $query->result();
    }
    return array();
}
function mostViewedTracks() {
    $this->load->