gistfile1.py

    @ndb.transactional(xg=True)
    def remove(self, new_rep_id=None):
        # Un-assign this rep from all their stores.
        stores = Store.query_stores(rep_id = self.key, active=None)
        for store in stores:
            store.rep_id = new_rep_id
            store.put()
        self.active = False
        self.put()