Sort referenced Documents (DocumentSet)

[michael-mader]

Is it possible to sort the elements inside a DocumentSet where the Elements are stored as References?

I have two collections:

• article
• comment

Article:
protected static $_requirements = array( 'author' => array('Required'), 'headline' => array('Required'), 'text' => array('Required'), 'created' => array('Required'), 'comments' => array('DocumentSet'), 'comments.$' => array('Document:Application_Model_Comment', 'AsReference') );

Now I want to retrieve a specific article (via id) and get the associated comments sorted by the creation date.
Is this possible? Is it easy to implement something like that?