Method defer_dupe_check

test/orm/test_collection.py:59–64

(self)

    @contextlib.contextmanager
    def defer_dupe_check(self):
        self.dupe_check = False
        try:
            yield
        finally:
            self.dupe_check = True

    def listen(self, attr):
        event.listen(attr, "append", self.append)