ModelChoiceField with optiongroups
This is a ModelChoiceField where the choices are rendered in optiongroups (this is already posible with a normal Choicefield) For this to work properly the queryset you supply should already be ordered the way you want (i.e. by the group_by_field first, then any sub-ordering) See [related blog article](http://anentropic.wordpress.com/2010/03/23/django-optiongroups-for-your-modelchoice-field/)
- modelchoicefield
- optiongroup