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 test_ccode_constants_other():
    assert ccode(2*GoldenRatio) == "double const GoldenRatio = 1.61803398874989;\n2*GoldenRatio"
    assert ccode(
        2*Catalan) == "double const Catalan = 0.915965594177219;\n2*Catalan"
    assert ccode(2*EulerGamma) == "double const EulerGamma = 0.577215664901533;\n2*EulerGamma"