def post_iteration(self):
        self._continue = False  # by default, stop after one iteration
Unique constraint still allows saving an edited existing object.
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/driver.py/Driver.post_iteration--crossover with--dataset/ETHPy150Open mozilla/moztrap/tests/model/core/models/test_productversion.py/ProductVersionTest.test_unique_constraint_doesnt_prevent_edit