Diem, Symfony - Set value for Form field in processForm

File: config/generator.yml
form:
        display:
          NONE: [name, is_active, artist_id, category_id]
          Lyric: [lyric]
          Others: [slug, url, attributes, priority, singers_list, _huypv]
        class: SongAdminForm
        fields: {  }

File: templates/_huypv.php
<?php #echo $song->getName(); ?>
<input type="text" id="huypv" name="huypv" value="vkl" onclick="alert($('#huypv').val());"/>

 File: actions/actions.class.php
class songActions extends autoSongActions
{
  protected function processForm(sfWebRequest $request, sfForm $form)
  {
     
    $params = $request->getParameter($form->getName());
    # overwrite my value
    if ($request->getParameter('huypv')) $params['name'] = $request->getParameter('huypv');

    $form->bind($params, $request->getFiles($form->getName()));