def get_next_id(self):
        try:
            query = {'_id': 'last_id'}
            update = {'$inc': {'id': 1}}
            fn = self.db.internal.find_and_modify
            row = fn(query, update, upsert=True, new=True)
        except Exception as e:
            raise DatabaseException(e)
        return row['id']
def testWrapperKerasStyle(self, wrapper, wrapper_v2):
    """Tests if wrapper cell is instantiated in keras style scope."""
    wrapped_cell_v2 = wrapper_v2(rnn_cell_impl.BasicRNNCell(1))
    self.assertIsNone(getattr(wrapped_cell_v2, "_keras_style", None))

    wrapped_cell = wrapper(rnn_cell_impl.BasicRNNCell(1))
    self.assertFalse(wrapped_cell._keras_style)