how can upload PDF file about admin HOT 2 OPEN

    public function create($model = null, $options = array())
    {
        if (empty($options['class'])) {
            $options['class'] = 'well';
        }

        $modelKey = $this->model();
        $Model = ClassRegistry::init($modelKey);

        if(!empty($Model->displayFieldTypes)){
            if(in_array('image', $Model->displayFieldTypes) ||   in_array('file',$Model->displayFieldTypes)){
                      $type_val = array(
                          'type' => 'file'
                      );
                      $options = array_merge($type_val, $options);
                }
        }
        return parent::create($model, $options);
    }

var $displayFieldTypes = array(
    'src_big' => 'file'
);

var $upLoads = array(
    'imgDir' => 'files'
);