code: def set_object_acl(self, obj):
          
          if not obj._acl:
              from nefertari_guards import engine as guards_engine
              acl = self._factory(self.request).generate_item_acl(obj)
              obj._acl = guards_engine.ACLField.stringify_acl(acl)
docs: Set object ACL on creation if not already present.