from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic

class Place(models.Model):
    name = models.CharField('name')
    content_type = models.ForeignKey(ContentType)
    # Child model
    child = generic.GenericForeignKey(fk_field='id')
    
    def save(self, **kwargs):
        if not self.pk:
            self.content_type = ContentType.objects.get_for_model(self)
        super(Place, self).save(**kwargs)
    
class Restaurant(Place):
    pass