uploaderbehavior Follow @yiiframework

public function behaviors() {
        return array(            
            'UploaderBehavior' => array(
                'class' => 'ext.behaviors.UploaderBehavior',
                'uploadSavedPathAttributes' => array(
                    'picture_saved_path' => array(
                        'fileType' => 'image',
                        'fileName' => 'attribute name, if fileName attribute is not in required rule and you don not input it, fileName attribute will set it to you upload filename',
                        'fileSize' => 'file size attribute name',
                        'fileExt' => 'file extension attribute name',
                        'generateThumbnail' => true,
                    ),
                ),
            ),
        );
    }