How do I access no_monitor in save() function? - symfony1

Question

I've this configure() function in my form:
public function configure() {
$this->current_user = sfContext::getInstance()->getUser()->getGuardUser();
unset($this['updated_at'], $this['created_at']);
$this->widgetSchema['idempresa'] = new sfWidgetFormInputHidden();
$id_empresa = $this->current_user->getSfGuardUserProfile()->getIdempresa();
$this->setDefault('idempresa', $id_empresa);
$this->widgetSchema['no_emisor'] = new sfWidgetFormDoctrineChoice(array('model' => 'SdrivingEmisor', 'add_empty' => 'Seleccione un Emisor', 'expanded' => false, 'multiple' => false));
$this->validatorSchema['idempresa'] = new sfValidatorPass();
$this->validatorSchema['no_emisor'] = new sfValidatorPass();
}
And I'm need to define a relation data in save() function so I do this:
public function save($con = null) {
$new_machine = parent::save($con);
$relation = new SdrivingMaquinaEmisor();
$relation->setIdmaquina($new_machine);
$relation->setIdemisor();
$relation->save();
return $new_machine;
}
In order the set the Idemisor, how do I access to the selected value when users submit the form? Is this the best way to achieve this?
EDIT
After take the suggestion about how to access no_emisor value now my code looks like:
public function save($con = null) {
$new_machine = parent::save($con);
$relation = new SdrivingMaquinaEmisor();
$relation->setIdmaquina($new_machine);
$relation->setIdemisor($this->values['no_emisor']);
$relation->save();
return $new_machine;
}
But I get this error:
SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'idmaquina' cannot be null
For some reason $new_machine doesn't return the id of the latest saved element. Maybe I'm doing in the wrong way so what I'm doing wrong?

Answer 1

I think you might want to do this in the form's doUpdateObject instead, since that receives the cleaned values.
http://www.symfony-project.org/api/1_4/sfFormObject#method_doupdateobject
Edit:
Alternatively, $this->values['no_emisor'] should work once the form has been bound.