pre- , post- or instead- :: domain object processing

If you need to run somth action -before, -after or instead of object saving you could use "Behavior" Propel feature.

for example - generated code contains such block:

1. public function save(PropelPDO $con = null)  
2. {  
3.    foreach (sfMixer::getCallables('BaseSampleModel:save:pre') as $callable)  
4.    {  
5.      $affectedRows = call_user_func($callable, $this, $con);  
6.      if (is_int($affectedRows))  
7.      {  
8.        return $affectedRows;  
9.      }  
10.    }  
11. ...  
12. }  

 public function save(PropelPDO $con = null)
 {
    foreach (sfMixer::getCallables('BaseSampleModel:save:pre') as $callable)
    {
      $affectedRows = call_user_func($callable, $this, $con);
      if (is_int($affectedRows))
      {
        return $affectedRows;
      }
    }
 ...
 }

on callable getting framework searches for 'BaseSampleModel:save:pre'

It's internal rule creation for behavior events:

1. sfMixer::register('Base'.$class.$hook, $callable);  

sfMixer::register('Base'.$class.$hook, $callable);

For calling somth. before model saving:
1. add to propel.ini
propel.builder.addBehaviors = true

2. Register handlers (you can add code to the end of domain object)

1. sfPropelBehavior::registerHooks('before_instance_creation', array(':save:post' => array('SampleModel', 'createNewParamInstance')));  
2. sfPropelBehavior::add('SampleModel', array('before_instance_creation'));  

sfPropelBehavior::registerHooks('before_instance_creation', array(':save:post' => array('SampleModel', 'createNewParamInstance')));
sfPropelBehavior::add('SampleModel', array('before_instance_creation'));

after that - hook will be registered. so - on hook handling SampleModel::createNewParamInstance will be executed.
3. Add callable

1. <!--php<br /-->  
2. class SampleModel extends BaseSampleModel  
3. {  
4.  ...  
5.  public static function createNewParamInstance($obj) {  
6.   // GO !  
7.  }  
8. }  

class SampleModel extends BaseSampleModel
{
 ...
 public static function createNewParamInstance($obj) {
  // GO !
 }
}