Implements Observers

[WanWizard]

Observers allow for custom callbacks to be defined at critical locations in the DataMapper core, which could be used to pre- or post process the object's data, add additional logic, etc.

Original issue from DataMapper v1.

see http://codeigniter.com/forums/viewthread/149388/P530/#783616 and http://codeigniter.com/forums/viewthread/149388/P540/#783667

[WanWizard]

Observers should replace the static code now built-in for working with created and updated timestamps in records. This means less code and quicker execution for those that don't need this feature.

[WanWizard]

Reply from @colonelchorine

Wan, I noticed that Jamierumbelow's base model MY_Model uses various callbacks/hooks for before and after events. I've always found this kind of confusing, because I find that by simply using standard OOP inheritance, you can accomplish the same thing.

Like so:

class Something extends BaseModel {
   function update() {
      do_something_before();
      parent::update();
      do_something_after();
   }
}

Not sure if this fits into the Datamapper pattern you've made, but it was just a thought.

[WanWizard]

This works for real "before" and "after", but not for hook points in the code, like "before_save", "before_insert", etc.