forms - CUploadedFile::getInstance Always Returns Null on Uploaded File -

i have built form in yii , need process uploaded file. followed this guide, i've stumbled upon issue. cuploadedfile::getinstance returns null.

here's use. model:

class additionalfieldfile extends cformmodel {      public $uploadedfile;      /**      * @return array validation rules model attributes.      */     public function rules() {         return array(             //note wont need safe rule here             array('uploadedfile', 'file', 'allowempty' => true, 'types' => 'zip,doc,xls,ppt,jpg,gif,png,txt,docx,pptx,xlsx,pdf,csv,bmp'),         );     }  } 

and handling uploaded file in controller on form submit:

$model = new additionalfieldfile(); $model->uploadedfile = cuploadedfile::getinstance($model, 'field_'.$type_field.'['.$id_common.']'); 

and after $model->uploadedfile null reason.

note $type_field , $id_common come dynamically.

also, form has 'enctype'=>'multipart/form-data' not cause.

ok, self-answer follows.

it turns out had use active file field in view, using instance of class extends cformmodel model.

solution:

chtml::activefilefield(new additionalfieldfile(), 'field_'.$type_field.'['.$id_common.']');