def delete(self, *args, **kwargs):
primitive_instance_fields = self.fields.filter(
value__model__in=MetaModel.get_primitive())
for field in primitive_instance_fields:
field.value.delete()
return super(InstanceModel, self).delete(*args, **kwargs)
def delete_non_used_primitives(cls):
cls.objects.filter(model__in=MetaModel.get_primitive(),
fields_usage__isnull=True).delete()