disable drop-db task in symfony console

ProjectConfiguration.class.php

<?php

class ProjectConfiguration extends sfProjectConfiguration
{
    public function setup()
    {
        $this->dispatcher->connect('command.filter_options', array($this, 'filterCommandOptions'));
    }

    /**
     * Filters command options.
     *
     * @param   sfEvent $event
     * @param   array   $options
     *
     * @return  array
     */
    public function filterCommandOptions(sfEvent $event, $options) {

        if ('sfDoctrineDropDbTask' === get_class($event->getSubject()))
        {
            $event->getSubject()->logSection('doctrine', 'You are not allowed to drop database', null, 'ERROR');
            die();
        }
        return $options;
    }
}