You have managers, executives and simple workers. To validate a manager we generated codes which we later distributed between them. Executives and simple workers didn't have to use a validation code. Therefore a simple input field of type text was provided only if a person registering on our site chose the position manager. Therefore I couldn't make this field as required because it was only required for a certain group of people registering on our site.

The validation rule was simple. I compared the code provided during registration with the one saved in the database and returned true or false according to the case. The problem I encountered was in the case that if a person chose manager and did not provide any input (an empty field), the error message was not displayed at all. I mean you could probably solve this problem using JavaScript but server side validation is always important. Researching the core code of symfony I found a place where this case is not considered an error. I could possibly change the core, but I didn't want to do that only for one case. I mean, if it would be a problem with many fields I would probably consider it necessary, but I've found a solution for that problem without changing the core code. Here is how I accomplished it.

I assume that you are familiar with symfony framework, therefore I wont explain the whole process from the beginning. In my /apps/myproject/lib folder I created a class extending sfValidation class, where I placed the database check. Unfortunately, defining additional string validation rules ($string == null etc.) in that class did not solve my problem that an error did not appear when the field was empty.

I did some more reading and I've found a really interesting solution. In your action.class.php file besides executeXXX() methods you can define additional validateXXX() methods, which are executed before executeXXX() methods. I placed a simple string validation rule in this method (with min value of 1) and it works like a charm right now. Below you can see my code:

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public function validateIndex() {
  //manager code validation
  if($this->getRequestParameter('position') == 'manager') {
    $managerCode = $this->getRequestParameter('manager_code');
 
    $val = new sfStringValidator();
    $val->initialize($this->getContext(), array(
      'min' => 1,
    ));
    if (!$val->execute($managerCode)) {
      $this->getRequest()->setError('managerCode', $this->getContext()->getI18N()->__('You have to fill out the code', null, 'user'));
      return false;
    }
    return true;
  }
}

As I said before this approach might get pretty annoying if you are dealing with multiple fields but for me it was just this one. I hope this solution will help you during your development. As usually I'm waiting for your feedback. Cheers!