function save()
 {
     $asset_detail = new Asset_Detail();
     $asset_detail->asset_id = $this->asset_id;
     $asset_detail->assetd_status = $this->input->post('assetd_status');
     $asset_detail->staff_id = $this->input->post('staff_id');
     $asset_detail->date = $this->input->post('date');
     $asset_detail->descriptions = $this->input->post('descriptions');
     if ($asset_detail->save()) {
         $this->session->set_flashdata('message', 'Asset detail successfully created!');
         redirect('assets/' . $this->asset_id . '/details/index');
     } else {
         // Failed
         $asset_detail->error_message('custom', 'Field required');
         $msg = $asset_detail->error->custom;
         $this->session->set_flashdata('message', $msg);
         redirect('assets/' . $this->asset_id . '/details/add');
     }
 }