def close(self):
        if self.mongo:
            try:
                self.mongo.disconnect()
            except Exception as ex:
                self.log.error('Problem disconnecting mongo: %s', ex)
            self.mongo = None
        self.app.mongodb = None
Returns whether two values have changed.
dataset/ETHPy150Open erkyrath/tworld/lib/two/mongomgr.py/MongoMgr.close--crossover with--dataset/ETHPy150Open reviewboard/reviewboard/reviewboard/reviews/fields.py/BaseCommaEditableField.has_value_changed