gistfile1.php

<?php

class BaseDoctrineForm extends sfFormDoctrine
{
  public function __construct($object = null, $options = array(), $CSRFSecret = null)
  {
    parent::__construct($object, $options, $CSRFSecret);

    // tell the widget schema which fields are required
    $this->widgetSchema->addOption(
      'required_fields',
      $this->getRequiredFields()
    );
  }

  // ...
}