I have two models like this:

class OptionsAndFeatures(models.Model):
   options = models.TextField(blank=True, null=True)
   entertainment = models.TextField(blank=True, null=True)
   seats_trim = models.TextField(blank=True, null=True)
   convenience = models.TextField(blank=True, null=True)
   body_exterior = models.TextField(blank=True, null=True)
   lighting = models.TextField(blank=True, null=True)
   safety = models.TextField(blank=True, null=True)
   powertrain = models.TextField(blank=True, null=True)
   suspension_handling = models.TextField(blank=True, null=True)
   specs_dimensions = models.TextField(blank=True, null=True)
   offroad_capability = models.TextField(blank=True, null=True)
class Vehicle(models.Model):
   ...
   options_and_features = models.ForeignKey(OptionsAndFeatures, blank=True, null=True)

I have a model form for the OptionsAndFeaturesclass that I'm using in both the add and edit views. In the add view it works just fine. But the edit view renders the OptionsAndFeatures as blank. The code for the edit view is as follows:

def edit_vehicle(request, stock_number=None):   
   vehicle = get_object_or_404(Vehicle, stock_number=stock_number)

   if request.method == 'POST':
      # save info
   else:
       vehicle_form = VehicleForm(instance=vehicle)
       photos = PhotosFormSet(instance=vehicle)
       options = OptionsForm(instance=vehicle)

   #render_to_reponse

What could be the problem here?