Just quick post today about loading helpers in symfony 1.2 from an action or model.

Previously I would use the sfLoader class to load a helper, but it now says:

The sfLoader::loadHelpers() method is deprecated. Please use the same method from sfApplicationConfiguration.

So, from the action you should now use:

$this->getContext()->getConfiguration()->loadHelpers('Url');

From the model you can use:

sfContext::getInstance()->getConfiguration()->loadHelpers('Url');