cakephp - auto empty option on drop down list

Is there a way to "automagically" add the empty option to a drop down list?

What I'm looking for is to add this option on a drop down list of a belongTo relation that can be null, without having to add code on the view.

I do believe this should be a Model option, that could be useful for example on a scaffold.

You could override the _findList method or make a new custom find and use _findList (call it say _findSelectList). Example:

protected function _findList($state, $query, $results = array()) {
    $return = parent::_findList($state, $query, $results);
    if ($state === 'after') {
        $return = array('' => 'select one') + $return;
    }
    return $return;
}

Or you could extend FormHelper and add the empty option there by default which I think would be simpler. You may actually be able to get away with setting empty in inputDefaults when calling $this->Form->create('Model', array('inputDefaults' => array('empty' => 'Select One')));. If this works and you don't want to do it in every form, extend FormHelper and set this as the default in it.